Natural Plant Polysaccharides as Functional Cryoprotectants for Low-Temperature Food Preservation

Abstract

Low-temperature food preservation is a foundational component of modern food infrastructure, yet freezing remains a source of multiscale product degradation through ice crystal growth, recrystallization, protein denaturation, and oxidative reactions. Natural plant polysaccharides have emerged as promising functional cryoprotectants because they can modify water mobility, form structured networks, and stabilize freeze-concentrated matrices without the metabolic, sensory, and labeling concerns often associated with synthetic polyols. This paper develops a system-level analysis of plant polysaccharides in low-temperature food preservation, treating cryoprotection not as a single molecular property but as an architectural problem distributed across formulation, processing, refrigeration, logistics, and regulatory environments. The discussion examines the structural logic of polysaccharide-based cryoprotective networks, including hydrogen-bonded hydration layers, sol-gel transitions, and ice recrystallization inhibition. It further analyzes trade-offs among cryoprotective efficacy, rheological processability, sensory neutrality, cost, and environmental performance. Frozen dough, ice cream, surimi, and starch gel systems are used as comparative illustrations. The paper argues that the successful deployment of natural polysaccharide cryoprotectants depends on their integration into cold chain governance, sustainability assessment, quality assurance, and equitable innovation pathways. A socio-technical perspective is therefore required to move beyond proof-of-concept formulations and toward robust, scalable, and fair food preservation systems. Forward-looking research priorities include structure-function mapping under realistic freezing histories, life cycle accounting, and policy coordination across food safety, agricultural sourcing, and cold chain decarbonization.