Industrial Applications of Red Macroalgae Phycocolloids

Phycocolloids derived from red algae, including agar, carrageenan, and related sulfated polysaccharides, have attracted growing interest due to their multifunctional properties and wide-ranging industrial applications. These marine biopolymers exhibit unique structural characteristics and bioactivities that support their use in food, pharmaceutical, cosmetic, and biomedical sectors. This review provides a comprehensive synthesis of current knowledge on red algae phycocolloids, beginning with their biological origin, biosynthetic pathways, and ecological roles. It highlights recent advances in extraction and purification technologies, with a focus on improving yield, safety, and environmental sustainability. The review also explores emerging applications in drug delivery, tissue engineering, and green technologies, underscoring their potential in sustainable innovation. Key challenges—including regulatory constraints, scalability, and the need for interdisciplinary collaboration—are discussed, along with future directions for research and industrial development. This work aims to support the strategic integration of red algae phycocolloids into next-generation biotechnological solutions.