packaging as crucial factors to assure food quality and safety. biodegradable chitosan films have potential for preserving various food products, retaining their firmness and restricting weight loss due to dehydration. in addition, composite biodegradable films containing chitosan and antimicrobial agents are in development as safe alternatives to preserve food products. battery electrolyte chitosan is being investigated as an electrolyte for rechargeable batteries with good performance and low environmental impact due to rapid biodegradability, leaving recycleable zinc. the electrolyte has excellent physical stability up to 50 °c, electrochemical stability up to 2 v with zinc electrodes, and accommodates redox reactions involved in the zn-mno2 alkaline system. as of 2022 results were promising, but the battery needed testing on a larger scale and under actual use conditions.