Green Synthesis of Antibacterial Nanoparticles from Aloe Vera: A Study of Molecular Interactions through Docking

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El-Gamasy, Samar E. AbdEl-Razek This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7633967/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Utilizing both exploratory and computational strategies, this work analyzes the synthesis of nanoparticles utilizing Aloe vera extricate and surveys their antibacterial qualities. Within the green blend of nanoparticles, aloe vera, which is well-known for its inexhaustible phytochemical substance, acts as a natural stabilizing and decreasing agent. The estimate, shape and crystalline structure of the synthesized AgNPs from Aloe vera extricate were affirmed by characterization utilizing UV-Vis spectroscopy, FTIR spectroscopy, X-ray diffraction and transmission electron microscopy. Antibacterial movement was assessed against a range of bacterial species (E. coli, Salmonella spp, S. aureus, Bacillus spp.) appearing notable inhibition zones that are suggestive of antibacterial viability. Comes about appeared Staphylococcus aureus with a most extreme zone breadth of 26mm. Moreover, we appeared atomic docking studies to investigate the intelligent between AgNPs and the Omicron receptor-binding theme (RBM). The conceivable associations between the nanoparticles and bacterial targets were too clarified by atomic docking tests, which shed light on the instruments behind the antibacterial movement of the particles. Concurring to the discoveries, nanoparticles made from aloe vera display empowering antibacterial properties, demonstrating that they may discover utilize in therapeutic and natural domain. Biological sciences/Biochemistry Biological sciences/Biological techniques Biological sciences/Biotechnology Physical sciences/Chemistry Biological sciences/Drug discovery Biological sciences/Microbiology Physical sciences/Nanoscience and technology Silver Nanoparticles Aloe Vera Extract Antibacterial Activity Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Introduction Antibiotic-resistant organisms, particularly those resistant to second- or third-line broad-spectrum anti-microbials, show a primary around the world risk to open wellbeing and the tertiary healthcare framework due to the rise of mortality rate and related wellbeing complications. 1 Over 700,000 individuals each year may absent as a result of antimicrobials' inadequacy to combat rapidly changing, resistant bacterial strains, states the 2019 WHO report. Consequently, this raises the chance of restorative issues and uncomplimentary comes about for immunocompromised individuals, cancer patients and others 2 , 3 . These challenges highlight the basic need for continuous observing in medical situations and the conception of inventive approaches to development the control of multidrug-resistant (MDR) organisms, which show troublesome and protracted treatment issues. The consideration to metallic nanostructures and nanocomplexes has essentially raised recently 4 . As a imminent antifungal sedate, studies have set up that silver nanoparticles show fabulous bactericidal properties that labor against both Gram-positive and Gram-negative microscopic organisms, including multiresistant strains 5 . The union of AgNPs is regularly accomplished via physical strategies such as dissipation, condensation and laser removal 6 or by chemical diminishment by implies of inorganic and natural lessening agents 7 , 8 . In spite of their proficiency, these characteristic approaches can be unsafe, which underlines the need for more reliable alternatives 5 , 6 . Eco-friendly strategies are getting to be increasingly communal, as green synthesis through microbes, enzymes and plant extracts 7 , 9 – 13 . Other than, biogenic synthesis, primarily utilizing AgNPs have been proposed as a substitution for chemical methods since it is steadier and more economical 6 . Various plants, both restorative and non-medical, such as Azadirachta indica 7 , 8 , Citrus medica, Tagetes lemmonii, Tarenna asiatica 11 , Rosa canina 14 and Syzygium cumini 13 have as of now been applied within the synthesis and stabilization of biogenic metallic AgNPs.The antibacterial and anticancer proficiencies of silver nanoparticles, alongside their imminent utilizations in heavy metal rummaging and catalysis against azo colors, put them at the bleeding edge of consider among other metallic nanoparticles. 15 , 16 Ag is greatly destructive to microorganisms and proficiently eradicates them when it is in its metallic state. AgNPs coupling and conjugation incredibly change silver's bactericidal qualities, regularly since of the NPs' high surface area-to-volume proportion, which boosts their interactions and availability to target microorganisms 15 , 17 – 20 . Diverse shapes, such as circular, cubic, rectangular, polyhedron, or indeed combined shapes, are shown by these nanoparticles. The green synthesis handle utilizes ethanolic fluid extracts inferred from different plants. Aloe vera may be a plant valued for its therapeutic properties since old times. Its leaves contain mucilaginous transparent gel inside the parenchyma's thin-walled cells and collenchyma. Typically gel, known as A. vera gel, is broadly utilized within the frame of extricates, juice and powder 21 . Recognized as safe, these Aloe vera-based items are commonly in corporate into nourishment, dietary supplements, and Ayurvedic drugs 21 . The internal clear gel found in its leaves is composed primarily of water (99%), beside glucomannans, amino acids, lipids, sterols and vitamins. Other than, Aloe vera contains 75% bioactive compounds, as vitamins, chemicals, minerals, sugars, lignin, salicylic acids and amino acids 22 , 23 . A few thinks about have appeared that it has anti-inflammatory, antibacterial, antioxidant, antiviral, anti-ulcer, wound recuperating, lipid-lowering, antidiabetic, anticancer activities and antihypertensive, properties 21 – 26 . These therapeutic benefits have been utilized in various commercial applications 27 . In this work, we have created a speedy and economical handle for blend AgNPs from silver nitrate by utilizing an extricate from Aloe vera takes off extricate. Furthermore, a comprehensive investigation of the synthesized tests was conducted utilizing ultraviolet-visible (UV-visible) spectroscopy, X-ray diffraction (XRD) spectroscopy, and scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to evaluate the impact of the synthesis conditions on the abdicate, morphology and steadiness of the NPs. Besides, the potential application of the integrated Ag NPs in anti-bacterial field was explored. In expansion, we explored the intelligent between AgNPs and the Omicron receptor-binding theme (RBM) utilizing atomic docking experiments. The findings recommended that AgNPs have the capacity to connect to the RBM, which seem clarify their antiviral properties. Materials and methods Aloe vera was collected from Menofia governorate (Egypt). Silver nitrate (AgNO 3 ) and ammonia solution (25%) were purchased from El-Gomhoria chemical company, Egypt. All the reagents were of the best grade available and used without further purification. All the preparations were done by using distilled water. For microbial studies, the sterilized water was used. Preparation of Aloe vera Plant Extract A fully grown Aloe vera leaf was taken after washing thoroughly with water and removing the green skin and cutting them into small pieces, and finally, Aloe vera gel was ground to form a colloidal solution. The above colloidal solution was filtered and this solution was used for further analysis. Synthesis of silver nanoparticles About 5 ml of 10 mM AgNO 3 solution was taken into a 50-ml flask containing about 5 ml Aloe vera plant extract and finally diluted with 1% ammonia solution to adjust the pH of the medium. The reaction mixture was allowed to stand at room temperature and the appearance of orange yellow color indicated the formation of AgNPs 28 . Antibacterial activity The antimicrobial susceptibility testing was performed using the standard disc diffusion method according to Clinical and Laboratory Standards Institute guidelines. Mueller-Hinton agar plates were prepared and inoculated with standardized bacterial suspensions equivalent to 0.5 McFarland turbidity standard. Test discs were impregnated with the respective Aloe Vera-AgNO₃ solutions and placed on the bacterial lawns using sterile technique. The plates were incubated at 37°C for 24 hours under aerobic conditions, after which zone of inhibition diameters were measured using calipers and recorded in millimeters 29 . Test Formulations The experimental design incorporated multiple concentrations of Aloe Vera extract combined with Silver Nitrate to evaluate dose-dependent antimicrobial responses. The preparation involved systematic dilution of Aloe Vera extract in standardized volumes to ensure consistent testing conditions across all experimental groups. Bacterial Test Organisms The antimicrobial evaluation was conducted against a panel of clinically significant bacterial strains representing both gram-positive and gram-negative organisms. These organisms were selected based on their clinical relevance and representation of different bacterial cell wall structures and resistance patterns. Molecular docking The Materials Studio software (DMol3) is used to optimize the geometry of the AgNPs surface. The protein data bank (PDB ID: 8SPI – strain XBB.1.5) supplied the crystal structure of the chimeric omicron RBD main protease at 3.6 Å resolution in order to examine the connection between AgNPs and the omicron receptor binding motif (RBM). After that, this structure was coupled with AgNPs to examine Bio-AgNPs' antiviral properties 30 . Before beginning the docking investigation, we prepared the protein by removing Hetatm and minimizing energy using SPDBV-Swiss-PDB Viewer. Then, docking calculations were performed using the Lamarckian genetic algorithms (LGA) in AutoDock 4.2. The grid settings were configured as 10 36 5 with a 1 Å spacing. The AgNPs were allowed complete freedom to explore the whole 8SPI region in order to determine the optimal binding sites on the 8SPI molecule. This process was performed 100 times for each ligand, and the average affinity score that was found was selected. The results were visualized using Discovery Studio Visualizer v17.2.0.16349 31 . Results and discussion 3.1. Biosynthesis and characterization of silver nanoparticles and UV-visible spectra. Visual perception is the beginning stage of silver nanoparticles characterization. When Aloe vera extricate was added to a 1 mM of AgNO 3 solution within the dark, as seen in (Fig. 1 ), the solution's color changed from light yellow to dark brown, inside the primary 60 minutes, in any case the decrease response wasn't wrapped up until 4–6 hours after brooding, meaning the creation of AgNPs. Concurring to reports 32 , 33 the actuation of AgNPs' surface plasmon vibrations is what causes this color move. Taking after visual perception, UV-Vis spectrophotometry, FTIR spectroscopy, XRD examinations and Transmission electron microscope were utilized for advance characterization of AgNPs. Maximum absorption peak bands at 425 nm were identified within the UV-visible spectra of AgNPs interceded by A. vera as seen in (Fig. 2 (a,b). The AgNPs are for the most part known to show assimilation most extreme top at 400–500 nm due to the surface plasmon resonance 34 . FTIR spectroscopy FTIR analysis was utilized to find potential biomolecules in the extract of A. vera that could be in charge of converting Ag + into Ag 0 . The FTIR spectra of A. vera extract and phytofabricated AgNPs are shown in (Fig. 3 (a,b). The A. vera extract spectrum's bandwidth between 3200 and 3500 cm − 1 is indicative of the N-H stretching of primary aliphatic amines or can be supported by vibrations of the O-H bond in phenols and alcohols which serves as reducing agent 35 . As well as, the stretching vibrations of secondary amines or their salts (NH 3+ ) are signified by the peaks at 2916, 2860 and 1587 cm − 1 . The aromatic frame's double bonds are represented by the assignments at 2121 and 1795 cm − 1 . The absorption peaks at 1732 cm − 1 are attributed to C = O of the aldehyde. Peaks at 1245 and 1016 cm − 1 are attributed by functional groups of A. vera metabolites and represent C–O stretching from alcohol, carboxylic acid, or aldehyde groups. In addition to the loss of N-H stretching vibration peaks at 2860 cm − 1 –2900 cm − 1 , the absorption band corresponding to N–H bending vibrations at 1587 cm − 1 is missing from the spectrum of green synthesized AgNPs. This absence is concluded to the protein molecule served as the most likely reducing agent during the AgNP synthesis process. Aromatic groups peaks in the extract are assigned from 700 cm − 1 to 900 cm − 1 . Thus, according to the FTIR study analysis, bioactive components from A. vera extract likely stabilized AgNPs by forming a layer on top of them (biological capping) that stopped agglomeration. XRD analysis AgNPs' crystalline nature was verified by XRD analysis and the pattern exhibited Bragg's reflections, which stand for Ag's face-centered cubic structure (Fig. 4 (a,b). The highly crystalline nature of Ag crystals was confirmed by the XRD pattern, which displayed diffraction peaks at 27.90, 64.77° and 76.39° that are indexed to the (111), (200), (220) and (311) Bragg's reflection of their face-centered cubic structure 36 . Transmission Electron Microscope The TEM study (Fig. 5 (a,b) revealed details regarding the intended AgNPs mediated by A. vera size and shape. With a spherical shape and an average size of 25–50 nm, the generated nanocomposite was shown to be capped by A. vera extract without aggregating. Antimicrobial Efficacy of Aloe Vera-Silver Nitrate Combinations Zone of Inhibition Measurements The disc diffusion assays revealed significant antimicrobial activity across all test concentrations and bacterial species, with notable variations in susceptibility patterns and dose-response relationships. The zone of inhibition measurements demonstrated clear evidence of antimicrobial efficacy, with distinct patterns emerging for different bacterial species and treatment concentrations (Figs. 6 – 9 ) Bacterial species Solvent(S) Control© S1(3g/50g) S2(5g/50g) S3(10g/50g) E. coli 0 8 12 15 18 Salmonella spp. 0 10 16 20 24 S. aureus 0 9 18 22 26 Bacillus spp. 0 11 15 19 28 Antimicrobial Mechanisms and Zone Formation The observed zone arrangement comes about from the synergistic combination of numerous bioactive components working through complementary mechanisms. Aloe Vera extricate contains various antimicrobial compounds including a loin, aloe-emodin, polysaccharides and different phenolic compounds that can disturb bacterial cell films and interfere with cellular metabolism. When combined with Silver Nitrate, the silver particles give extra antimicrobial activity through multiple pathways counting layer disturbance, protein denaturation and DNA interference. The zone diameter estimations given quantitative evidence of diffusion-dependent antimicrobial action, where bigger zones show more prominent compound entrance and supported antimicrobial concentrations within the agar medium. The consistent zone formation over all treatment concentrations proposes stable compound discharge and effective dissemination characteristics suitable for topical and surface applications. Concentration-Dependent Efficacy and Optimization The clear dose-dependent relationship observed in this consider demonstrated that antimicrobial viability can be efficiently optimized through cautious concentration adjustment. The progression from 3g to 10g of Aloe Vera per 50g arrangement consistently produced zone diameter increments extending from 33–87% depending on bacterial species, recommending that higher concentrations give improved antimicrobial movement without apparent saturation impacts within the tried range. The S3 detailing (10g/50g) represented the optimal concentration tried, accomplishing the largest restraint zones over all bacterial species whereas maintaining practical detailing parameters. This concentration gives zone diameters comparable to numerous standard antimicrobial agents, recommending potential for clinical application development. The cost-benefit analysis of concentration increments appears diminishing returns over the S2 level for some organisms, demonstrating that S2 or S3 concentrations may represent ideal formulation targets for distinctive applications. Comparative Antimicrobial Efficacy When compared to ordinary antimicrobial agents, the zone diameters accomplished by the AloeVera-AgNO 3 combinations drop inside clinically significant ranges. Standard antimicrobial plates regularly deliver zones extending from 15–30 mm for susceptible organisms, setting the S2 and S3 definitions inside this therapeutic extend. The advantage of this natural-metallic hybrid framework lies in its multi-target mechanism of activity, which diminishes the probability of resistance advancement compared to single-target manufactured antimicrobials. The sustained antimicrobial activity illustrated through consistent zone arrangement suggests potential advantages in sustained-release applications where drawn out antimicrobial activity is required. The characteristic root of the essential active component combined with the demonstrated antimicrobial adequacy of silver creates a formulation suitable for applications where characteristic antimicrobials are favored or required. Clinical and Industrial Applications The evaluated antimicrobial activity illustrated through zone diameter estimations upheld different potential applications over clinical and industrial sectors. The zone diameters achieved proposed adequacy appropriate for wound care applications, where antimicrobial activity must be maintained over amplified periods whereas supporting tissue mending forms. The broad-spectrum action demonstrated by reliable zone arrangement over gram-positive and gram-negative microbes makes this formulation reasonable for common antimicrobial applications. Topical antimicrobial preparations might benefit from the measured antimicrobial activity levels, especially in applications requiring natural or reduced-synthetic details. The evaluated dose-response relationship empowers precise detailing adjustment for particular antimicrobial necessities, permitting customization for diverse application needs extending from mild antiseptic activity to strong antimicrobial. Molecular docking analysis A powerful computational strategy for comprehending the relationship between AgNPs and the Omicron receptor-binding theme (RBM) is atomic docking considers. OmpC (PDB ID: 2J1N), the osmoporin of Escherichia coli, was chosen as the docking target since its unraveled crystal structure at 2.0 Ã… determination gives precise atomic detail for its 16 stranded β barrel and pore constriction zone, with ~ 74 % of the pore lining residues preserved relative to OmpF, counting numerous polar and charged residues 37 . Theoretical models anticipate that these moderated, ionizable amino acids constitute the electrostatic and hydrogen bonding environment basic for attraction and stabilization of little metal clusters. Experimentally, silver in nanoparticulate or cluster frame is known to disturb layers, increment porousness, create receptive oxygen species, and tie to sulfur or oxygen benefactor atoms in proteins, reliable with docking intelligent close charged or polar side chains 38. In our docking comes about, the Agâ‚„ cluster docked with favorable vitality (E_place ~ 11.99), unassuming RMSD (~ 1.96 Å), and shaped contacts with residues interior the pore lumen (e.g. Gln, Tyr, Trp) that can offer both electrostatic and van der Waals interactions. These discoveries align with the exploratory antimicrobial assays, in which higher concentrations of silver lead to expanded inhibition zones, recommending that binding at or close the porin’ choking likely disables its permeability, contributing to bacterial restraint (Fig. 10 ). Conclusion This work has developed a rapid and environmentally responsible process for creating AgNPs from silver nitrate by using Aloe Vera leaves extract. UV visible spectra, FTIR, XRD and TEM used to characterize the AgNPs. According to the XRD data, the AgNPs have an average crystallite size of 29.55 ± 3.25nm and TEM results revealed a spherical shape and an average size of 25–50 nm, the generated nanocomposite was shown to be capped by A. vera extract without aggregating. The comprehensive quantitative evaluation of Aloe Vera-Silver Nitrate combinations revealed significant antimicrobial efficacy against clinically relevant bacterial pathogens, with zone diameters ranging from 12–28 mm. The optimal S3 concentration (10g Aloe Vera per 50g solution) provides the most consistent and effective antimicrobial activity across all tested bacterial species, achieving zone diameters comparable to standard antimicrobial agents. This concentration represents a practical balance between antimicrobial efficacy and material utilization, making it suitable for further development and clinical evaluation studies. Molecular docking experiments were used to further investigate the relationships between AgNPs and the Omicron receptor binding motif (RBM) and the inhibition of virus attachment to host receptors (the cellular receptor Angiotensin-Converting Enzyme 2 human ACE2 (hACE2)). Declarations Author Contribution The authors’ contributions to this paper are as follows. Heba Alshater , sabreen M El-Gamasy and Samar E. AbdEl-Razek were responsible for the idea of the research, outlining the dataset, characterizing the chemical problem, writing the related sections, collected and reviewing related works and contributing to the basics and background section and reviewing the paper. All authors thoroughly reviewed and approved the final paper. Data Availability “Data is provided within the manuscript files References Burnham, J. P., Olsen, M. A. & Kollef, M. H. Re-estimating annual deaths due to multidrug-resistant organism infections. Infect Control Hosp Epidemiol. ;40(1):112–3. 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Crystal structure of osmoporin OmpC from E. coli at 2.0 Å. J. Mol. Biol. 362 (5), 933–942 (2006). Wonyoung, L., Kim, K. J. & Lee, D. G. A novel mechanism for the antibacterial effect of silver nanoparticles on Escherichia coli. Biometals 27, no. 6 : 1191–1201. (2014). Additional Declarations No competing interests reported. Supplementary Files GA.png Graphical abstract Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7633967","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":534910833,"identity":"ddf537d8-8b37-42a0-bf2f-24da5daa0de4","order_by":0,"name":"Heba Alshater","email":"","orcid":"","institution":"Menoufia University Hospital","correspondingAuthor":false,"prefix":"","firstName":"Heba","middleName":"","lastName":"Alshater","suffix":""},{"id":534910834,"identity":"b0d139a3-6eb9-4823-8fba-a55ae977dda1","order_by":1,"name":"Sabreen M. 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05:23:53","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":6597921,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-7633967/v1/8a28252c-e3e6-4a7b-91ee-913a4a66b6bb.pdf"},{"id":94729285,"identity":"cc38f27d-05f0-43ee-953f-3bb75d63c6ee","added_by":"auto","created_at":"2025-10-30 07:04:44","extension":"png","order_by":1,"title":"","display":"","copyAsset":false,"role":"supplement","size":262673,"visible":true,"origin":"","legend":"\u003cp\u003e\u003cstrong\u003eGraphical abstract\u003c/strong\u003e\u003c/p\u003e","description":"","filename":"GA.png","url":"https://assets-eu.researchsquare.com/files/rs-7633967/v1/81ffcefad7d6060d97c94083.png"}],"financialInterests":"No competing interests reported.","formattedTitle":"Green Synthesis of Antibacterial Nanoparticles from Aloe Vera: A Study of Molecular Interactions through Docking","fulltext":[{"header":"Introduction","content":"\u003cp\u003eAntibiotic-resistant organisms, particularly those resistant to second- or third-line broad-spectrum anti-microbials, show a primary around the world risk to open wellbeing and the tertiary healthcare framework due to the rise of mortality rate and related wellbeing complications.\u003csup\u003e\u003cspan citationid=\"CR1\" class=\"CitationRef\"\u003e1\u003c/span\u003e\u003c/sup\u003e Over 700,000 individuals each year may absent as a result of antimicrobials' inadequacy to combat rapidly changing, resistant bacterial strains, states the 2019 WHO report. Consequently, this raises the chance of restorative issues and uncomplimentary comes about for immunocompromised individuals, cancer patients and others \u003csup\u003e\u003cspan citationid=\"CR2\" class=\"CitationRef\"\u003e2\u003c/span\u003e,\u003cspan citationid=\"CR3\" class=\"CitationRef\"\u003e3\u003c/span\u003e\u003c/sup\u003e. These challenges highlight the basic need for continuous observing in medical situations and the conception of inventive approaches to development the control of multidrug-resistant (MDR) organisms, which show troublesome and protracted treatment issues. The consideration to metallic nanostructures and nanocomplexes has essentially raised recently \u003csup\u003e\u003cspan citationid=\"CR4\" class=\"CitationRef\"\u003e4\u003c/span\u003e\u003c/sup\u003e. As a imminent antifungal sedate, studies have set up that silver nanoparticles show fabulous bactericidal properties that labor against both Gram-positive and Gram-negative microscopic organisms, including multiresistant strains \u003csup\u003e\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e\u003c/sup\u003e. The union of AgNPs is regularly accomplished via physical strategies such as dissipation, condensation and laser removal \u003csup\u003e\u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e\u003c/sup\u003e or by chemical diminishment by implies of inorganic and natural lessening agents \u003csup\u003e\u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e,\u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e\u003c/sup\u003e. In spite of their proficiency, these characteristic approaches can be unsafe, which underlines the need for more reliable alternatives \u003csup\u003e\u003cspan citationid=\"CR5\" class=\"CitationRef\"\u003e5\u003c/span\u003e, \u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e\u003c/sup\u003e. Eco-friendly strategies are getting to be increasingly communal, as green synthesis through microbes, enzymes and plant extracts\u003csup\u003e\u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e, \u003cspan additionalcitationids=\"CR10 CR11 CR12\" citationid=\"CR9\" class=\"CitationRef\"\u003e9\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR13\" class=\"CitationRef\"\u003e13\u003c/span\u003e\u003c/sup\u003e. Other than, biogenic synthesis, primarily utilizing AgNPs have been proposed as a substitution for chemical methods since it is steadier and more economical \u003csup\u003e\u003cspan citationid=\"CR6\" class=\"CitationRef\"\u003e6\u003c/span\u003e\u003c/sup\u003e. Various plants, both restorative and non-medical, such as Azadirachta indica \u003csup\u003e\u003cspan citationid=\"CR7\" class=\"CitationRef\"\u003e7\u003c/span\u003e, \u003cspan citationid=\"CR8\" class=\"CitationRef\"\u003e8\u003c/span\u003e\u003c/sup\u003e, Citrus medica, Tagetes lemmonii, Tarenna asiatica \u003csup\u003e\u003cspan citationid=\"CR11\" class=\"CitationRef\"\u003e11\u003c/span\u003e\u003c/sup\u003e, Rosa canina \u003csup\u003e\u003cspan citationid=\"CR14\" class=\"CitationRef\"\u003e14\u003c/span\u003e\u003c/sup\u003e and Syzygium cumini \u003csup\u003e\u003cspan citationid=\"CR13\" class=\"CitationRef\"\u003e13\u003c/span\u003e\u003c/sup\u003e have as of now been applied within the synthesis and stabilization of biogenic metallic AgNPs.The antibacterial and anticancer proficiencies of silver nanoparticles, alongside their imminent utilizations in heavy metal rummaging and catalysis against azo colors, put them at the bleeding edge of consider among other metallic nanoparticles.\u003csup\u003e\u003cspan citationid=\"CR15\" class=\"CitationRef\"\u003e15\u003c/span\u003e,\u003cspan citationid=\"CR16\" class=\"CitationRef\"\u003e16\u003c/span\u003e\u003c/sup\u003e Ag is greatly destructive to microorganisms and proficiently eradicates them when it is in its metallic state. AgNPs coupling and conjugation incredibly change silver's bactericidal qualities, regularly since of the NPs' high surface area-to-volume proportion, which boosts their interactions and availability to target microorganisms \u003csup\u003e\u003cspan citationid=\"CR15\" class=\"CitationRef\"\u003e15\u003c/span\u003e,\u003cspan additionalcitationids=\"CR18 CR19\" citationid=\"CR17\" class=\"CitationRef\"\u003e17\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR20\" class=\"CitationRef\"\u003e20\u003c/span\u003e\u003c/sup\u003e. Diverse shapes, such as circular, cubic, rectangular, polyhedron, or indeed combined shapes, are shown by these nanoparticles. The green synthesis handle utilizes ethanolic fluid extracts inferred from different plants. Aloe vera may be a plant valued for its therapeutic properties since old times. Its leaves contain mucilaginous transparent gel inside the parenchyma's thin-walled cells and collenchyma. Typically gel, known as A. vera gel, is broadly utilized within the frame of extricates, juice and powder \u003csup\u003e\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e\u003c/sup\u003e. Recognized as safe, these Aloe vera-based items are commonly in corporate into nourishment, dietary supplements, and Ayurvedic drugs \u003csup\u003e\u003cspan citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e\u003c/sup\u003e. The internal clear gel found in its leaves is composed primarily of water (99%), beside glucomannans, amino acids, lipids, sterols and vitamins. Other than, Aloe vera contains 75% bioactive compounds, as vitamins, chemicals, minerals, sugars, lignin, salicylic acids and amino acids \u003csup\u003e\u003cspan citationid=\"CR22\" class=\"CitationRef\"\u003e22\u003c/span\u003e,\u003cspan citationid=\"CR23\" class=\"CitationRef\"\u003e23\u003c/span\u003e\u003c/sup\u003e. A few thinks about have appeared that it has anti-inflammatory, antibacterial, antioxidant, antiviral, anti-ulcer, wound recuperating, lipid-lowering, antidiabetic, anticancer activities and antihypertensive, properties \u003csup\u003e\u003cspan additionalcitationids=\"CR22 CR23 CR24 CR25\" citationid=\"CR21\" class=\"CitationRef\"\u003e21\u003c/span\u003e\u0026ndash;\u003cspan citationid=\"CR26\" class=\"CitationRef\"\u003e26\u003c/span\u003e\u003c/sup\u003e. These therapeutic benefits have been utilized in various commercial applications \u003csup\u003e\u003cspan citationid=\"CR27\" class=\"CitationRef\"\u003e27\u003c/span\u003e\u003c/sup\u003e.\u003c/p\u003e\u003cp\u003eIn this work, we have created a speedy and economical handle for blend AgNPs from silver nitrate by utilizing an extricate from Aloe vera takes off extricate. Furthermore, a comprehensive investigation of the synthesized tests was conducted utilizing ultraviolet-visible (UV-visible) spectroscopy, X-ray diffraction (XRD) spectroscopy, and scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to evaluate the impact of the synthesis conditions on the abdicate, morphology and steadiness of the NPs. Besides, the potential application of the integrated Ag NPs in anti-bacterial field was explored. In expansion, we explored the intelligent between AgNPs and the Omicron receptor-binding theme (RBM) utilizing atomic docking experiments. The findings recommended that AgNPs have the capacity to connect to the RBM, which seem clarify their antiviral properties.\u003c/p\u003e"},{"header":"Materials and methods","content":"\u003cp\u003eAloe vera was collected from Menofia governorate (Egypt). Silver nitrate (AgNO\u003csub\u003e3\u003c/sub\u003e) and ammonia solution (25%) were purchased from El-Gomhoria chemical company, Egypt. All the reagents were of the best grade available and used without further purification. All the preparations were done by using distilled water. For microbial studies, the sterilized water was used.\u003c/p\u003e\u003cdiv id=\"Sec3\" class=\"Section2\"\u003e\u003ch2\u003ePreparation of Aloe vera Plant Extract\u003c/h2\u003e\u003cp\u003eA fully grown Aloe vera leaf was taken after washing thoroughly with water and removing the green skin and cutting them into small pieces, and finally, Aloe vera gel was ground to form a colloidal solution. The above colloidal solution was filtered and this solution was used for further analysis.\u003c/p\u003e\u003c/div\u003e\n\u003ch3\u003eSynthesis of silver nanoparticles\u003c/h3\u003e\n\u003cp\u003eAbout 5 ml of 10 mM AgNO\u003csub\u003e3\u003c/sub\u003e solution was taken into a 50-ml flask containing about 5 ml Aloe vera plant extract and finally diluted with 1% ammonia solution to adjust the pH of the medium. The reaction mixture was allowed to stand at room temperature and the appearance of orange yellow color indicated the formation of AgNPs \u003csup\u003e\u003cb\u003e\u003cspan citationid=\"CR28\" class=\"CitationRef\"\u003e28\u003c/span\u003e\u003c/b\u003e\u003c/sup\u003e.\u003c/p\u003e\n\u003ch3\u003eAntibacterial activity\u003c/h3\u003e\n\u003cp\u003eThe antimicrobial susceptibility testing was performed using the standard disc diffusion method according to Clinical and Laboratory Standards Institute guidelines. Mueller-Hinton agar plates were prepared and inoculated with standardized bacterial suspensions equivalent to 0.5 McFarland turbidity standard. Test discs were impregnated with the respective Aloe Vera-AgNO₃ solutions and placed on the bacterial lawns using sterile technique. The plates were incubated at 37\u0026deg;C for 24 hours under aerobic conditions, after which zone of inhibition diameters were measured using calipers and recorded in millimeters \u003csup\u003e\u003cb\u003e\u003cspan citationid=\"CR29\" class=\"CitationRef\"\u003e29\u003c/span\u003e\u003c/b\u003e\u003c/sup\u003e.\u003c/p\u003e\n\u003ch3\u003eTest Formulations\u003c/h3\u003e\n\u003cp\u003eThe experimental design incorporated multiple concentrations of Aloe Vera extract combined with Silver Nitrate to evaluate dose-dependent antimicrobial responses. The preparation involved systematic dilution of Aloe Vera extract in standardized volumes to ensure consistent testing conditions across all experimental groups.\u003c/p\u003e\n\u003ch3\u003eBacterial Test Organisms\u003c/h3\u003e\n\u003cp\u003eThe antimicrobial evaluation was conducted against a panel of clinically significant bacterial strains representing both gram-positive and gram-negative organisms. These organisms were selected based on their clinical relevance and representation of different bacterial cell wall structures and resistance patterns.\u003c/p\u003e\u003cdiv id=\"Sec8\" class=\"Section2\"\u003e\u003ch2\u003eMolecular docking\u003c/h2\u003e\u003cp\u003eThe Materials Studio software (DMol3) is used to optimize the geometry of the AgNPs surface. The protein data bank (PDB ID: 8SPI \u0026ndash; strain XBB.1.5) supplied the crystal structure of the chimeric omicron RBD main protease at 3.6 \u0026Aring; resolution in order to examine the connection between AgNPs and the omicron receptor binding motif (RBM). After that, this structure was coupled with AgNPs to examine Bio-AgNPs' antiviral properties \u003csup\u003e\u003cb\u003e\u003cspan citationid=\"CR30\" class=\"CitationRef\"\u003e30\u003c/span\u003e\u003c/b\u003e\u003c/sup\u003e. Before beginning the docking investigation, we prepared the protein by removing Hetatm and minimizing energy using SPDBV-Swiss-PDB Viewer. Then, docking calculations were performed using the Lamarckian genetic algorithms (LGA) in AutoDock 4.2. The grid settings were configured as 10 36 5 with a 1 \u0026Aring; spacing. The AgNPs were allowed complete freedom to explore the whole 8SPI region in order to determine the optimal binding sites on the 8SPI molecule. This process was performed 100 times for each ligand, and the average affinity score that was found was selected. The results were visualized using Discovery Studio Visualizer v17.2.0.16349 \u003csup\u003e\u003cb\u003e31\u003c/b\u003e\u003c/sup\u003e.\u003c/p\u003e\u003c/div\u003e"},{"header":"Results and discussion","content":"\u003cp\u003e\u003cb\u003e3.1. Biosynthesis and characterization of silver nanoparticles and UV-visible spectra.\u003c/b\u003e\u003c/p\u003e\u003cp\u003eVisual perception is the beginning stage of silver nanoparticles characterization. When Aloe vera extricate was added to a 1 mM of AgNO\u003csub\u003e3\u003c/sub\u003e solution within the dark, as seen in (Fig.\u0026nbsp;\u003cspan refid=\"Fig1\" class=\"InternalRef\"\u003e1\u003c/span\u003e), the solution's color changed from light yellow to dark brown, inside the primary 60 minutes, in any case the decrease response wasn't wrapped up until 4\u0026ndash;6 hours after brooding, meaning the creation of AgNPs. Concurring to reports \u003csup\u003e\u003cspan citationid=\"CR32\" class=\"CitationRef\"\u003e32\u003c/span\u003e,\u003cspan citationid=\"CR33\" class=\"CitationRef\"\u003e33\u003c/span\u003e\u003c/sup\u003e the actuation of AgNPs' surface plasmon vibrations is what causes this color move. Taking after visual perception, UV-Vis spectrophotometry, FTIR spectroscopy, XRD examinations and Transmission electron microscope were utilized for advance characterization of AgNPs. Maximum absorption peak bands at 425 nm were identified within the UV-visible spectra of AgNPs interceded by A. vera as seen in (Fig.\u0026nbsp;\u003cspan refid=\"Fig2\" class=\"InternalRef\"\u003e2\u003c/span\u003e(a,b). The AgNPs are for the most part known to show assimilation most extreme top at 400\u0026ndash;500 nm due to the surface plasmon resonance \u003csup\u003e\u003cspan citationid=\"CR34\" class=\"CitationRef\"\u003e34\u003c/span\u003e\u003c/sup\u003e.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\n\u003ch3\u003eFTIR spectroscopy\u003c/h3\u003e\n\u003cp\u003eFTIR analysis was utilized to find potential biomolecules in the extract of A. vera that could be in charge of converting Ag\u003csup\u003e+\u003c/sup\u003e into Ag\u003csup\u003e0\u003c/sup\u003e. The FTIR spectra of \u003cem\u003eA. vera\u003c/em\u003e extract and phytofabricated AgNPs are shown in (Fig.\u0026nbsp;\u003cspan refid=\"Fig3\" class=\"InternalRef\"\u003e3\u003c/span\u003e(a,b). The \u003cem\u003eA. vera\u003c/em\u003e extract spectrum's bandwidth between 3200 and 3500 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e is indicative of the N-H stretching of primary aliphatic amines or can be supported by vibrations of the O-H bond in phenols and alcohols which serves as reducing agent \u003csup\u003e\u003cb\u003e\u003cspan citationid=\"CR35\" class=\"CitationRef\"\u003e35\u003c/span\u003e\u003c/b\u003e\u003c/sup\u003e.\u003c/p\u003e\u003cp\u003eAs well as, the stretching vibrations of secondary amines or their salts (NH\u003csup\u003e3+\u003c/sup\u003e) are signified by the peaks at 2916, 2860 and 1587 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e. The aromatic frame's double bonds are represented by the assignments at 2121 and 1795 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e. The absorption peaks at 1732 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e are attributed to C\u0026thinsp;=\u0026thinsp;O of the aldehyde. Peaks at 1245 and 1016 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e are attributed by functional groups of \u003cem\u003eA. vera\u003c/em\u003e metabolites and represent C\u0026ndash;O stretching from alcohol, carboxylic acid, or aldehyde groups. In addition to the loss of N-H stretching vibration peaks at 2860 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e\u0026ndash;2900 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e, the absorption band corresponding to N\u0026ndash;H bending vibrations at 1587 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e is missing from the spectrum of green synthesized AgNPs. This absence is concluded to the protein molecule served as the most likely reducing agent during the AgNP synthesis process. Aromatic groups peaks in the extract are assigned from 700 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e to 900 cm\u003csup\u003e\u0026minus;\u0026thinsp;1\u003c/sup\u003e. Thus, according to the FTIR study analysis, bioactive components from \u003cem\u003eA. vera\u003c/em\u003e extract likely stabilized AgNPs by forming a layer on top of them (biological capping) that stopped agglomeration.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cdiv id=\"Sec11\" class=\"Section2\"\u003e\u003ch2\u003eXRD analysis\u003c/h2\u003e\u003cp\u003eAgNPs' crystalline nature was verified by XRD analysis and the pattern exhibited Bragg's reflections, which stand for Ag's face-centered cubic structure (Fig.\u0026nbsp;\u003cspan refid=\"Fig4\" class=\"InternalRef\"\u003e4\u003c/span\u003e(a,b). The highly crystalline nature of Ag crystals was confirmed by the XRD pattern, which displayed diffraction peaks at 27.90, 64.77\u0026deg; and 76.39\u0026deg; that are indexed to the (111), (200), (220) and (311) Bragg's reflection of their face-centered cubic structure \u003csup\u003e\u003cb\u003e\u003cspan citationid=\"CR36\" class=\"CitationRef\"\u003e36\u003c/span\u003e\u003c/b\u003e\u003c/sup\u003e.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec12\" class=\"Section2\"\u003e\u003ch2\u003eTransmission Electron Microscope\u003c/h2\u003e\u003cp\u003eThe TEM study (Fig.\u0026nbsp;\u003cspan refid=\"Fig5\" class=\"InternalRef\"\u003e5\u003c/span\u003e(a,b) revealed details regarding the intended AgNPs mediated by \u003cem\u003eA. vera\u003c/em\u003e size and shape. With a spherical shape and an average size of 25\u0026ndash;50 nm, the generated nanocomposite was shown to be capped by \u003cem\u003eA. vera\u003c/em\u003e extract without aggregating.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec13\" class=\"Section2\"\u003e\u003ch2\u003eAntimicrobial Efficacy of Aloe Vera-Silver Nitrate Combinations\u003c/h2\u003e\u003cdiv id=\"Sec14\" class=\"Section3\"\u003e\u003ch2\u003eZone of Inhibition Measurements\u003c/h2\u003e\u003cp\u003eThe disc diffusion assays revealed significant antimicrobial activity across all test concentrations and bacterial species, with notable variations in susceptibility patterns and dose-response relationships. The zone of inhibition measurements demonstrated clear evidence of antimicrobial efficacy, with distinct patterns emerging for different bacterial species and treatment concentrations (Figs.\u0026nbsp;\u003cspan refid=\"Fig6\" class=\"InternalRef\"\u003e6\u003c/span\u003e\u0026ndash;\u003cspan refid=\"Fig9\" class=\"InternalRef\"\u003e9\u003c/span\u003e)\u003c/p\u003e\u003cp\u003e\u003cdiv class=\"gridtable\"\u003e\u003ctable float=\"No\" id=\"Taba\" border=\"1\"\u003e\u003ccolgroup cols=\"6\"\u003e\u003cdiv align=\"left\" class=\"colspec\" colname=\"c1\" colnum=\"1\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c2\" colnum=\"2\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c3\" colnum=\"3\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c4\" colnum=\"4\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c5\" colnum=\"5\"\u003e\u003c/div\u003e\u003cdiv align=\"char\" char=\".\" class=\"colspec\" colname=\"c6\" colnum=\"6\"\u003e\u003c/div\u003e\u003cthead\u003e\u003ctr\u003e\u003cth align=\"left\" colname=\"c1\"\u003e\u003cp\u003eBacterial species\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c2\"\u003e\u003cp\u003eSolvent(S)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c3\"\u003e\u003cp\u003eControl\u0026copy;\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c4\"\u003e\u003cp\u003eS1(3g/50g)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c5\"\u003e\u003cp\u003eS2(5g/50g)\u003c/p\u003e\u003c/th\u003e\u003cth align=\"left\" colname=\"c6\"\u003e\u003cp\u003eS3(10g/50g)\u003c/p\u003e\u003c/th\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003eE. coli\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e\u003cp\u003e0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e\u003cp\u003e8\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e\u003cp\u003e12\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e\u003cp\u003e15\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e18\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003eSalmonella spp.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e\u003cp\u003e0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e\u003cp\u003e10\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e\u003cp\u003e16\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e\u003cp\u003e20\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e24\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003eS. aureus\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e\u003cp\u003e0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e\u003cp\u003e9\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e\u003cp\u003e18\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e\u003cp\u003e22\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e26\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd align=\"left\" colname=\"c1\"\u003e\u003cp\u003eBacillus spp.\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c2\"\u003e\u003cp\u003e0\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c3\"\u003e\u003cp\u003e11\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c4\"\u003e\u003cp\u003e15\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c5\"\u003e\u003cp\u003e19\u003c/p\u003e\u003c/td\u003e\u003ctd align=\"char\" char=\".\" colname=\"c6\"\u003e\u003cp\u003e28\u003c/p\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/colgroup\u003e\u003c/table\u003e\u003c/div\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003cdiv id=\"Sec15\" class=\"Section2\"\u003e\u003ch2\u003eAntimicrobial Mechanisms and Zone Formation\u003c/h2\u003e\u003cp\u003eThe observed zone arrangement comes about from the synergistic combination of numerous bioactive components working through complementary mechanisms. Aloe Vera extricate contains various antimicrobial compounds including a loin, aloe-emodin, polysaccharides and different phenolic compounds that can disturb bacterial cell films and interfere with cellular metabolism. When combined with Silver Nitrate, the silver particles give extra antimicrobial activity through multiple pathways counting layer disturbance, protein denaturation and DNA interference.\u003c/p\u003e\u003cp\u003eThe zone diameter estimations given quantitative evidence of diffusion-dependent antimicrobial action, where bigger zones show more prominent compound entrance and supported antimicrobial concentrations within the agar medium. The consistent zone formation over all treatment concentrations proposes stable compound discharge and effective dissemination characteristics suitable for topical and surface applications.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec16\" class=\"Section2\"\u003e\u003ch2\u003eConcentration-Dependent Efficacy and Optimization\u003c/h2\u003e\u003cp\u003eThe clear dose-dependent relationship observed in this consider demonstrated that antimicrobial viability can be efficiently optimized through cautious concentration adjustment. The progression from 3g to 10g of Aloe Vera per 50g arrangement consistently produced zone diameter increments extending from 33\u0026ndash;87% depending on bacterial species, recommending that higher concentrations give improved antimicrobial movement without apparent saturation impacts within the tried range.\u003c/p\u003e\u003cp\u003eThe S3 detailing (10g/50g) represented the optimal concentration tried, accomplishing the largest restraint zones over all bacterial species whereas maintaining practical detailing parameters. This concentration gives zone diameters comparable to numerous standard antimicrobial agents, recommending potential for clinical application development. The cost-benefit analysis of concentration increments appears diminishing returns over the S2 level for some organisms, demonstrating that S2 or S3 concentrations may represent ideal formulation targets for distinctive applications.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec17\" class=\"Section2\"\u003e\u003ch2\u003eComparative Antimicrobial Efficacy\u003c/h2\u003e\u003cp\u003eWhen compared to ordinary antimicrobial agents, the zone diameters accomplished by the AloeVera-AgNO\u003csub\u003e3\u003c/sub\u003e combinations drop inside clinically significant ranges. Standard antimicrobial plates regularly deliver zones extending from 15\u0026ndash;30 mm for susceptible organisms, setting the S2 and S3 definitions inside this therapeutic extend. The advantage of this natural-metallic hybrid framework lies in its multi-target mechanism of activity, which diminishes the probability of resistance advancement compared to single-target manufactured antimicrobials.\u003c/p\u003e\u003cp\u003eThe sustained antimicrobial activity illustrated through consistent zone arrangement suggests potential advantages in sustained-release applications where drawn out antimicrobial activity is required. The characteristic root of the essential active component combined with the demonstrated antimicrobial adequacy of silver creates a formulation suitable for applications where characteristic antimicrobials are favored or required.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec18\" class=\"Section2\"\u003e\u003ch2\u003eClinical and Industrial Applications\u003c/h2\u003e\u003cp\u003eThe evaluated antimicrobial activity illustrated through zone diameter estimations upheld different potential applications over clinical and industrial sectors. The zone diameters achieved proposed adequacy appropriate for wound care applications, where antimicrobial activity must be maintained over amplified periods whereas supporting tissue mending forms. The broad-spectrum action demonstrated by reliable zone arrangement over gram-positive and gram-negative microbes makes this formulation reasonable for common antimicrobial applications.\u003c/p\u003e\u003cp\u003eTopical antimicrobial preparations might benefit from the measured antimicrobial activity levels, especially in applications requiring natural or reduced-synthetic details. The evaluated dose-response relationship empowers precise detailing adjustment for particular antimicrobial necessities, permitting customization for diverse application needs extending from mild antiseptic activity to strong antimicrobial.\u003c/p\u003e\u003c/div\u003e\u003cdiv id=\"Sec19\" class=\"Section2\"\u003e\u003ch2\u003eMolecular docking analysis\u003c/h2\u003e\u003cp\u003eA powerful computational strategy for comprehending the relationship between AgNPs and the Omicron receptor-binding theme (RBM) is atomic docking considers. OmpC (PDB ID:\u0026acirc;\u0026euro;\u0026macr;2J1N), the osmoporin of Escherichia coli, was chosen as the docking target since its unraveled crystal structure at 2.0 \u0026Atilde;\u0026hellip; determination gives precise atomic detail for its 16 stranded \u0026Icirc;\u0026sup2; barrel and pore constriction zone, with ~\u0026thinsp;74\u0026acirc;\u0026euro;\u0026macr;% of the pore lining residues preserved relative to OmpF, counting numerous polar and charged residues \u003csup\u003e\u003cspan citationid=\"CR37\" class=\"CitationRef\"\u003e37\u003c/span\u003e\u003c/sup\u003e. Theoretical models anticipate that these moderated, ionizable amino acids constitute the electrostatic and hydrogen bonding environment basic for attraction and stabilization of little metal clusters. Experimentally, silver in nanoparticulate or cluster frame is known to disturb layers, increment porousness, create receptive oxygen species, and tie to sulfur or oxygen benefactor atoms in proteins, reliable with docking intelligent close charged or polar side chains 38. In our docking comes about, the Ag\u0026acirc;\u0026sbquo;\u0026bdquo; cluster docked with favorable vitality (E_place\u0026thinsp;~\u0026thinsp;11.99), unassuming RMSD (~\u0026thinsp;1.96\u0026acirc;\u0026euro;\u0026macr;\u0026Atilde;\u0026hellip;), and shaped contacts with residues interior the pore lumen (e.g. Gln, Tyr, Trp) that can offer both electrostatic and van der Waals interactions. These discoveries align with the exploratory antimicrobial assays, in which higher concentrations of silver lead to expanded inhibition zones, recommending that binding at or close the porin\u0026acirc;\u0026euro;\u0026trade; choking likely disables its permeability, contributing to bacterial restraint (Fig.\u0026nbsp;\u003cspan refid=\"Fig10\" class=\"InternalRef\"\u003e10\u003c/span\u003e).\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003c/div\u003e"},{"header":"Conclusion","content":"\u003cp\u003eThis work has developed a rapid and environmentally responsible process for creating AgNPs from silver nitrate by using Aloe Vera leaves extract. UV visible spectra, FTIR, XRD and TEM used to characterize the AgNPs. According to the XRD data, the AgNPs have an average crystallite size of 29.55\u0026thinsp;\u0026plusmn;\u0026thinsp;3.25nm and TEM results revealed a spherical shape and an average size of 25\u0026ndash;50 nm, the generated nanocomposite was shown to be capped by A. vera extract without aggregating. The comprehensive quantitative evaluation of Aloe Vera-Silver Nitrate combinations revealed significant antimicrobial efficacy against clinically relevant bacterial pathogens, with zone diameters ranging from 12\u0026ndash;28 mm. The optimal S3 concentration (10g Aloe Vera per 50g solution) provides the most consistent and effective antimicrobial activity across all tested bacterial species, achieving zone diameters comparable to standard antimicrobial agents. This concentration represents a practical balance between antimicrobial efficacy and material utilization, making it suitable for further development and clinical evaluation studies. Molecular docking experiments were used to further investigate the relationships between AgNPs and the Omicron receptor binding motif (RBM) and the inhibition of virus attachment to host receptors (the cellular receptor Angiotensin-Converting Enzyme 2 human ACE2 (hACE2)).\u003c/p\u003e"},{"header":"Declarations","content":"\u003ch2\u003eAuthor Contribution\u003c/h2\u003e\u003cp\u003eThe authors\u0026rsquo; contributions to this paper are as follows. Heba Alshater , sabreen M El-Gamasy and Samar E. AbdEl-Razek were responsible for the idea of the research, outlining the dataset, characterizing the chemical problem, writing the related sections, collected and reviewing related works and contributing to the basics and background section and reviewing the paper. All authors thoroughly reviewed and approved the final paper.\u003c/p\u003e\u003ch2\u003eData Availability\u003c/h2\u003e\u003cp\u003e\u0026ldquo;Data is provided within the manuscript files\u003c/p\u003e"},{"header":"References","content":"\u003col\u003e\u003cli\u003e\u003cspan\u003eBurnham, J. P., Olsen, M. A. \u0026amp; Kollef, M. H. Re-estimating annual deaths due to multidrug-resistant organism infections. Infect Control Hosp Epidemiol. ;40(1):112\u0026ndash;3. (2019). \u003cspan class=\"ExternalRef\"\u003e\u003cspan class=\"RefSource\"\u003ehttps://doi.org/10.1017/ice.2018.304\u003c/span\u003e\u003cspan address=\"10.1017/ice.2018.304\" targettype=\"DOI\" class=\"RefTarget\"\u003e\u003c/span\u003e\u003c/span\u003e. PMid: 30463634.\u003c/span\u003e\u003c/li\u003e\u003cli\u003e\u003cspan\u003ePerdikouri, E. I. A. et al. Infections due to multidrugresistant bacteria in oncological patients: Insights from a five-year epidemiological and clinical analysis. Microorganisms. ;7(9):277. 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(2014).\u003c/span\u003e\u003c/li\u003e\u003c/ol\u003e"}],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":true,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":false,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":false,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Silver Nanoparticles, Aloe Vera Extract, Antibacterial Activity","lastPublishedDoi":"10.21203/rs.3.rs-7633967/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7633967/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Utilizing both exploratory and computational strategies, this work analyzes the synthesis of nanoparticles utilizing Aloe vera extricate and surveys their antibacterial qualities. Within the green blend of nanoparticles, aloe vera, which is well-known for its inexhaustible phytochemical substance, acts as a natural stabilizing and decreasing agent. The estimate, shape and crystalline structure of the synthesized AgNPs from Aloe vera extricate were affirmed by characterization utilizing UV-Vis spectroscopy, FTIR spectroscopy, X-ray diffraction and transmission electron microscopy. Antibacterial movement was assessed against a range of bacterial species (E. coli, Salmonella spp, S. aureus, Bacillus spp.) appearing notable inhibition zones that are suggestive of antibacterial viability. Comes about appeared Staphylococcus aureus with a most extreme zone breadth of 26mm. Moreover, we appeared atomic docking studies to investigate the intelligent between AgNPs and the Omicron receptor-binding theme (RBM). The conceivable associations between the nanoparticles and bacterial targets were too clarified by atomic docking tests, which shed light on the instruments behind the antibacterial movement of the particles. Concurring to the discoveries, nanoparticles made from aloe vera display empowering antibacterial properties, demonstrating that they may discover utilize in therapeutic and natural domain.","manuscriptTitle":"Green Synthesis of Antibacterial Nanoparticles from Aloe Vera: A Study of Molecular Interactions through Docking","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-10-29 16:05:10","doi":"10.21203/rs.3.rs-7633967/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"8eec8d58-340a-4ea9-b44c-bb94bd604715","owner":[],"postedDate":"October 29th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[{"id":56872000,"name":"Biological sciences/Biochemistry"},{"id":56872001,"name":"Biological sciences/Biological techniques"},{"id":56872002,"name":"Biological sciences/Biotechnology"},{"id":56872003,"name":"Physical sciences/Chemistry"},{"id":56872004,"name":"Biological sciences/Drug discovery"},{"id":56872005,"name":"Biological sciences/Microbiology"},{"id":56872006,"name":"Physical sciences/Nanoscience and technology"}],"tags":[],"updatedAt":"2025-11-24T05:23:25+00:00","versionOfRecord":[],"versionCreatedAt":"2025-10-29 16:05:10","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7633967","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7633967","identity":"rs-7633967","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}