Abstract：
This study describes the synthesis of Chitosan - corn protein (CSZ-TG) composites using TG enzyme (TG) as a cross-linking agent and the preparation of chitosan-based composite membrane material (CSZEO-TG) by blending citrus essential oil (EO) with the synthesized CSZ-TG. The prepared composite membrane material was used for fresh strawberry preservation and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-spectral diffraction, tensile properties, and water vapor and CO2 permeability. Scanning electron microscopy results showed a smooth surface of the composite membrane material after the addition of TG enzyme, while Fourier transforms infrared spectroscopy results showed a structural change of the composite membrane material after the addition of corn protein (Z). The tensile results showed an increase in the tensile strength of the composite membrane material after the addition of TG enzyme, while the flexibility of the composite membrane material was enhanced after the addition of EO. Compared with the pure chitosan membrane (CS), the water vapor and CO2 barrier properties of the composite membrane material after the addition of Z, TG, and EO did not change much, and they all showed better water vapor barrier properties. The results of the antioxidant analysis of the solution of the CSZEO-TG composite membrane material showed that the composite membrane material had efficient antioxidant properties. The effects of the composite film material on the storage period and quality of strawberries were evaluated by the indicators of weight loss, hardness, decay rate, soluble solids, titratable acid content, MDA content, and the content of four enzymes, SOD, POD, PPO and CAT. Comprehensive freshness data analysis showed that CSZEO-TG had the best freshness preservation performance and effectively extended the shelf life of strawberries.
摘要：
本研究描述了以TG酶(TG)为交联剂合成壳聚糖-玉米蛋白(CSZ-TG)复合材料，以及将柑橘精油(EO)与合成的CSZ-TG共混制备壳聚糖基复合膜材料(CSZEO-TG)。将制备的复合膜材料用于新鲜草莓的保鲜，并通过扫描电子显微镜进行表征，傅里叶变换红外光谱,X-光谱衍射,拉伸性能，以及水蒸气和CO2渗透率。扫描电子显微镜结果表明，添加TG酶后，复合膜材料的表面光滑，傅里叶变换红外光谱结果表明,添加玉米蛋白(Z)后,复合膜材料的结构发生了变化。拉伸结果表明，添加TG酶后，复合膜材料的拉伸强度增加，添加EO后，复合膜材料的柔韧性增强。与纯壳聚糖膜(CS)相比，添加Z后复合膜材料的水蒸气和CO2阻隔性能，TG,EO变化不大，它们都表现出更好的水蒸气阻隔性能。CSZEO-TG复合膜材料溶液的抗氧化分析结果表明,该复合膜材料具有高效的抗氧化性能。通过失重指标评价复合膜材料对草莓贮藏期和品质的影响,硬度,衰变率，可溶性固体，可滴定酸含量，MDA含量,和四种酶的含量，SOD,POD,PPO和CAT。综合保鲜数据分析表明,CSZEO-TG具有最佳的保鲜性能,有效延长了草莓的货架期。
