山苍子油基聚乙烯膜的抑菌活性及其对大米的保鲜作用  

Anti-bacterial Activity and Rice Fresh-keeping Property of Litsea cubeba Essential Oil-based Polyethylene Film

作　　者：辛慧 刘莹沛 王力群 周军[1,2] 李湘洲[1,2] XIN Hui;LIU Ying-pei;WANG Li-qun;ZHOU Jun;LI Xiang-zhou(School of Material Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Institute of Natural Product Research and Development,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004 [2]中南林业科技大学天然产物加工利用研究所,湖南长沙410004

出　　处：《食品工业科技》2019年第22期294-299,共6页Science and Technology of Food Industry

基　　金：2018年湖南省大学生研究性学习与创新性实验计划项目;国家重点研发计划项目(2017YFD0600704)

摘　　要：为研制具有抑菌活性的聚乙烯膜并探究其对大米储藏保鲜的性能,本文分别以山苍子油和山苍子油微胶囊为抑菌剂掺入聚乙烯基材中,利用挤出成型-吹塑成膜工艺制备了山苍子油基聚乙烯膜,考察膜的力学性能、表观形貌、抑菌活性及其应用于大米保鲜过程中对脂肪酸值和总酸值含量的影响。结果表明,掺入2%的山苍子油和2%山苍子油微胶囊聚乙烯膜(2%LCEO-M和2%LCEO-CM)具有较好的力学性能和抗菌活性,其中2%LCEO-M和2%LCEO-CM的抗拉强度分别为(23.72±1.94)和(20.27±1.78) MPa,断裂伸长率分别为(136.04%±2.59%)和(136.59%±3.26%),拉伸弹性模量分别为(107.99±2.77)和(120.42±2.89) MPa。2%LCEO-M和2%LCEO-CM的膜材料具有广谱抑菌活性,对大肠杆菌、金黄色葡萄球菌、青霉菌、灰霉菌和黄曲霉菌的抑制率均大于50%。在模拟高温高湿条件下,2%LCEO-M和2%LCEO-CM处理的大米主要是在储藏前期(0~14 d)能有效避免大米脂肪酸值和总酸值的快速上升,从而起到延缓大米陈化的目的。To prepare antibacterial polyethylene film and explore its performance of rice storage preservation,the bacteriostatic agents of Litsea cubeba essential oil(LCEO)and its mircocapsules were mixed into the base material of polyethylene and LCEO-based polyethylene film were prepared,respectively,by using extrusion molding and blow molding film technology. Then the mechanical properties,apparent morphology,anti-bacterial activity and its application in rice preservation on the contents of fatty acid value and the total acid were researched. The results showed that 2% LCEO-M and 2% LCEO-CM had good mechanical properties and antibacterial activity. The tensile strength of 2% LCEO-M and 2% LCEO-CM was(23.72±1.94) and(20.27±1.78) MPa,respectively,the elongation at break was(136.04%±2.59%)and(136.59%±3.26%),respectively,and the tensile elastic moduli was(107.99±2.77) MPa and(120.42±2.89) MPa,respectively. The films of 2% LCEO-M and 2% LCEO-CM had broad spectrum bacteriostatic activity,and the inhibition rates of Escherichia coli,Staphylococcus aureus,Penicillium,grey mold and Aspergillus were all greater than 50%. Under the simulated conditions of high temperature and high humidity,2% LCEO-M and 2% LCEO-CM could effectively avoid the rapid rise of fatty acid value and total acid value of rice in the early stage of rice storage(0~14 d),so as to delay the aging of rice.

关 键 词：山苍子油 山苍子油微胶囊 聚乙烯膜 吹塑成膜 抑菌 大米保鲜 

分 类 号：TS210.1[轻工技术与工程—粮食、油脂及植物蛋白工程]