A Comprehensive Review of Polysaccharide-Based Bioinks for 3D Bioprinting: Analyzing Structure–Property–Processing Relationships and Addressing Translational Challenges

Polysaccharide-based hydrogels represent sustainable and biocompatible bioinks for 3D bioprinting applications in regenerative medicine. However, their clinical translation is impeded by complex structure–property–processing interrelationships. This comprehensive review synthesizes existing literature on polysaccharides derived from seaweed, plant, microbial, and animal sources, correlating their chemical characteristics with rheological performance across extrusion, light-based, and embedded bioprinting modalities. It further critically examines crosslinking strategies, including ionic, photochemical, enzymatic, and hybrid approaches, alongside essential criteria for high-fidelity, cell-laden constructs, such as shear-thinning, yield stress, and post-print stability. By critically analyzing structure–property–processing relationships across seaweed-, plant-, microbial-, and animal-derived polysaccharides and evaluating key translational barriers from preclinical studies, this review distills design principles for next-generation hybrid bioinks. These principles emphasize double-network architectures, bioactive modifications, and perfusable constructs to advance clinically viable tissues and expedite the development of functional regenerative therapies.