可降解壳聚糖淀粉抗菌复合膜对红提葡萄保鲜效果的研究

Preservation effect of degradable chitosan starch antibacterial composite membrane on red grape

中文关键词:  抗菌复合膜  纳米氧化锌  壳聚糖淀粉复合膜  PE保鲜膜  保鲜  红提葡萄

英文关键词:antibacterial composite film  nano-ZnO  chitosan starch composite membrane  poly ethylene film  preservation  red grape

中文摘要:

      目的 研究可降解壳聚糖淀粉抗菌复合膜对红提葡萄的保鲜效果。方法 设置可降解壳聚糖淀粉抗菌复合膜组、可降解壳聚糖淀粉复合膜组、市售PE保鲜膜组和空白组4个组进行红提葡萄保鲜效果研究。果蔬保鲜效果用失重率、好果率、呼吸强度、可溶性固形物和总酸等指标评定, 其中失重率、好果率、呼吸强度和总酸采用常规方法测定; 可溶性固形物的测定应用手持折光仪。结果 红提葡萄贮藏60 d ((3±1) ℃)后, 空白组的失重率超过30%, 好果率仅为18%; 市售PE保鲜膜组的好果率为20%; 可降解壳聚糖淀粉复合膜组的失重率达到23%, 好果率约为40%; 可降解壳聚糖淀粉抗菌复合膜组的失重率仅为18%, 好果率可达到60%以上。结论 可降解壳聚糖淀粉抗菌复合膜具有良好的保水、抗菌功效, 可应用于葡萄保鲜。

英文摘要:

      Objective To investigate the effect of degradable chitosan starch antibacterial composite membrane on the freshness of red grape. Methods The degradable chitosan starch antibacterial composite membrane group, degradable chitosan starch composite membrane group, commercial PE film group and blank group were designed for studying the freshness of red grape. The weight loss rate, good fruit rate, respiratory intensity and total acidity which were always regarded as indexes for freshness assessment were determined by the conventional method. The soluble solid was measured by hand-held refraction instrument. Results After storage for 60 days ((3±1) ℃), the weight loss rate of blank group was more than 30% and the good fruit rate was only 18%. The good fruit rate of commercial PE film group was 20%. The weight loss rate of degradable chitosan starch composite membrane group was 23%, and the fruit rate was about 40%. The weight loss rate of degradable chitosan starch antibacterial composite membrane group was only 18%, and the fruit rate was over 60%. Conclusion The degradable chitosan starch antibacterial composite membrane has good water retention and antibacterial effect, which can be applied to the field of grape preservation.