Cryoprotective Strategies for Probiotics in Diverse Food Matrices: From Dairy to Plant-Based Applications

Cryopreservation has emerged as a critical technique for maintaining the viability and functional efficacy of probiotics during industrial manufacturing and shelf life. This review explores the current advances, challenges, and future prospects of cryopreservation technologies for probiotics in dairy and plant-based food matrices. Cryoprotectants, such as dimethyl sulfoxide (DMSO) and glycerol, and natural compounds, such as sugars and proteins, play crucial roles in mitigating cellular damage during freezing by preventing ice crystal formation, maintaining osmotic balance, and inducing vitrification. Cryopreservation techniques, including slow freezing, vitrification, and lyophilization have been optimized to enhance probiotic survival; however, strain-specific responses require tailored protocols for optimal results. Synergistic cryoprotectant combinations and advanced encapsulation methods have further improved post-thaw viability and functionality. The application of cryopreserved probiotics in dairy products, such as yogurt, cheese, and ice cream, has shown promising results, with high survival rates and enhanced sensory attributes. Non-dairy probiotic foods, including plant-based milk alternatives, fermented vegetables, and cereal-based products, have also benefited from cryopreservation, offering novel health-promoting options for diverse consumer preferences. However, challenges such as loss of viability during processing, regulatory concerns, and consumer acceptance issues persist. Future research should focus on developing innovative cryoprotective formulations, smart delivery systems, and synbiotic combinations to optimize probiotic stability and efficacy in functional food matrices. Addressing these challenges will expand the commercial viability and health benefits of probiotic-enriched foods.