Nian Linyu, Xie Yao, Sun Xiaoyang, Wang Mengjun, Cao Chongjiang
Department of Food Nutrition and Safety/National R&D Center for Chinese Herbal Medicine Processing, College of Engineering, China Pharmaceutical University, Nanjing 211198, China.
Department of Food Nutrition and Safety/National R&D Center for Chinese Herbal Medicine Processing, College of Engineering, China Pharmaceutical University, Nanjing 211198, China.
Int J Biol Macromol. 2023 Feb 15;228:286-298. doi: 10.1016/j.ijbiomac.2022.12.242. Epub 2022 Dec 26.
The postharvest physiological and metabolic activities caused fruits and vegetables (F&V) quality deterioration. Therefore, developing an efficient preservation strategy is a promising approach to relieve this issue. In this study, a modified metal-organic framework (MOF; i.e., Cer@MHKUST-1) was encapsulated into a blended matrix of chitosan quaternary ammonium salt (CQAS)/gelatin to fabricate a multifunctional (water-locking, ethylene-removing, and antibacterial) packaging biopolymer-based film (i.e., CMCGF), the characteristics and preservative effects of the packaging were investigated. Results indicated that the physicochemical (e.g., mechanical, gas/light barrier, wettability) properties of CMCGF were improved compared with the control film (i.e., CGF). CMCGF have a higher ethylene adsorption performance of 65-69 cm/g STP compared with CGF (7.8 cm/g STP). Cu ions released from CMCGF destroyed the cell wall and membrane, resulting in the death of bacteria, and the antibacterial efficiency of CMCGF against E. coli and S. aureus was 97-100 % and 98-100 %, respectively. Postharvest storage experiments on tomato and winter jujube confirmed the high-efficiency preservation effect of CMCGF packaging. Therefore, CMCGF provides a multifunctional approach to extending the shelf-life of perishable products to decrease food wastage.
采后生理和代谢活动会导致水果和蔬菜（F&V）品质下降。因此，制定一种有效的保鲜策略是缓解这一问题的一个有前景的方法。在本研究中，将一种改性金属有机框架（MOF；即Cer@MHKUST-1）封装到壳聚糖季铵盐（CQAS）/明胶的混合基质中，以制备一种多功能（锁水、除乙烯和抗菌）的基于生物聚合物的包装薄膜（即CMCGF），并研究了该包装的特性和保鲜效果。结果表明，与对照薄膜（即CGF）相比，CMCGF的物理化学性质（如机械性能、气体/光线阻隔性、润湿性）得到了改善。与CGF（7.8 cm/g STP）相比，CMCGF具有更高的乙烯吸附性能，为65 - 69 cm/g STP。从CMCGF释放的铜离子破坏了细菌的细胞壁和细胞膜，导致细菌死亡，CMCGF对大肠杆菌和金黄色葡萄球菌的抗菌效率分别为97 - 100%和98 - 100%。对番茄和冬枣的采后贮藏实验证实了CMCGF包装的高效保鲜效果。因此，CMCGF提供了一种多功能方法来延长易腐产品的货架期，以减少食物浪费。
