Effect of ultrasound-assisted extraction of dietary fibre from the sweetest variety Queen Pineapple peel waste of Tripura (India)

The study aimed to assess the functional attributes of dietary fibre from the sweetest variety of Queen pineapple of Tripura Region (India) having high pleasant aroma and flavour. Queen pineapple peel waste was used to extract dietary fibre, which is one of the important bioactive compounds in the human diet and health. The ultrasound-assisted extraction method was compared to the traditional alkali extraction method for extracting dietary fibre from Queen pineapple peel waste. The extracted dietary fibre was further examined for its functional attributes. The parameters used for ultrasound-assisted extraction (UAE) of dietary fibre were optimised using response surface methodology (RSM). The results showed that Queen pineapple peel waste was having a significant amount of dietary fibre and had a high potential in food processing. The conventional alkaline extraction yielded 64.43% dietary fibre, whereas the UAE method yielded 86.67% after 22.35 min of sonication with a solid: liquid ratio of 1:27.5 g/mL and a 46.9% ultrasonic amplitude. UAE improved the functional attributes of dietary fibre by significantly increasing the water-holding and swelling capacities while decreasing the oil holding capacity. The cation exchange capacity, glucose adsorption capacity, and glucose dialysis retardation index were enhanced considerably by ultrasound-assisted extraction, whereas the emulsifying capacity decreased. These findings suggested that Queen pineapple waste extracted dietary fibre could be used as a potential hypoglycemic agent as a functional food ingredient in bread and bakery-based products, meat-based products, dairy-based beverages, and other products of food application.