生物聚酯保鲜膜的制备及其保鲜效果比较  

Preparation and freshness preservation effect of biopolyester freshness preservation film

作　　者：孙颖[1,2] 白林 刘明昊 翁云宣 陈礼平[3] SUN Ying;BAI Lin;LIU Minghao;WENG Yunxuan;CHEN Liping(College of Chemistry and Materials Engineering,Beijing Technology and Business University,Beijing 100048,China;Institute of Plastic Processing&Application of Light Industry,Beijing 100048,China;BBCA Biochemical,Bengbu 233700,China)

机构地区：[1]北京工商大学化学与材料工程学院,北京100048 [2]轻工业塑料加工应用研究所,北京100048 [3]安徽丰原生物技术股份有限公司,安徽蚌埠233700

出　　处：《中国塑料》2023年第10期93-100,共8页China Plastics

基　　金：北京市教育委员会科学研究计划项目资助(KM202210011006);国家自然科学基金面上基金(52073004);北京市自然科学基金面上科学基金项目(4222042)。

摘　　要：以蓝莓为研究对象,利用双螺杆挤出机和流延机制备聚乙醇酸(PGA)/聚对苯二甲酸‑己二酸丁二酯(PBAT)生物降解复合膜,以酶活为考核指标,探究了不同复合膜对蓝莓保鲜品质的影响。以热失重、气体透过率、气体组成表征保鲜膜质量。结果表明,60%PGA/40%PBAT组可以有效抑制多酚氧化酶(PPO)活性含量升高,延缓抗坏血酸过氧化物酶(APX)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活性降低,PGA组延缓过氧化物酶(POD)活性和pH值降低;因此,PGA和PBAT复配后的生物降解保鲜膜更有利于蓝莓的保鲜,尤其是60%PGA/40%PBAT保鲜膜,其CO_(2)的体积分数可以控制在2%~3%之内,而O_(2)的体积分数则会因为储存的时长而不断下降,达到10%~12%;保存6天后酶活分别为:PPO为3.42 U/g、APX为5.98 U/g、SOD为8.37 U/g、POD为81.12 U/g、CAT为115.78 U/g。Taking blueberry as a research object,a series of biodegradable composite films based on polyglycolic acid(PGA)and polybutylene terephthalate adipate(PBAT)were prepared by using a twin‑screw extruder according the tape casting mechanism.The quality of cling film was characterized in terms of thermal weight loss,gas permeability,and gas composition.The results indicated that a mass ration of PGA to PBAT of 60∶40 could effectively inhibit an increase in the content of polyphenol oxidase(PPO)activity and delay a decrease in ascorbic acid peroxidase(APX),superoxide dismutase(SOD),and catalase(CAT)activity.The PGA group delayed the decrease of peroxidase(POD)activity and pH value.Therefore,the biodegradable preservation film composed of PGA and PBAT is more advantageous to the preservation for blueberries,especially for the preservation film containing 60%PGA and 40%PBAT.The CO_(2)volume fraction could be controlled within 2%~3%,whereas the O_(2)volume fraction continued to decrease with a variation of storage time to reach 10%~12%.After storage for six days,the enzyme activity was 3.42 U/g for PPO,5.98 U/g for APX,8.37 U/g for SOD,81.12 U/g for POD,and 115.78 U/g for CAT.

关 键 词：蓝莓保鲜 生物降解材料 保鲜膜改性 动力学 

分 类 号：TQ317[化学工程—高聚物工业]