Edible Fungal Polysaccharide–Liposome: Interfacial Interactions, Structure–Function Relationship, and Emerging Application in Oral Delivery and Functional Foods

Liposomes are among the most extensively studied delivery systems owing to their biocompatibility, structural versatility, and ability to improve the stability and bioavailability of bioactive compounds. Meanwhile, edible fungal polysaccharides (EFPs), particularly β-glucans and heteropolysaccharides, have attracted increasing interest because of their antioxidant, immunomodulatory, prebiotic, and health-promoting properties. The integration of EFPs with liposomal systems has emerged as a promising strategy for developing multifunctional nanocarriers with enhanced physicochemical stability and biological performance. However, current research remains fragmented, and the mechanisms by which EFP molecular structures influence liposome assembly, stability, gastrointestinal fate, and delivery efficiency are poorly understood. Moreover, existing reviews primarily focus on liposomes or fungal polysaccharides independently, without systematically addressing their interfacial interactions, structure-function relationships, and translational applications. This review provides a comprehensive and critical overview of EFP liposomes, highlighting the interactions between fungal polysaccharides and lipid bilayers, including hydrogen bonding, electrostatic interactions, hydrophobic association, and surface conjugation. The effects of EFPs on liposomal physicochemical properties, encapsulation performance, membrane stability, gastrointestinal protection, mucoadhesion, cellular uptake, and biological activity are further discussed. Emerging applications in targeted delivery, oral delivery, gut microbiota modulation, gut–brain axis regulation, and functional foods are also critically evaluated. Importantly, this review identifies key research gaps, including the lack of quantitative structure-function relationships, limited understanding of biological transport mechanisms, insufficient investigation of microbiota-mediated effects, and challenges in scalable manufacturing. By integrating glycobiology, nanotechnology, and food science, this review establishes a unified framework for the rational design and future development of EFP-based liposomal delivery systems.