聚乳酸活性抗菌薄膜的性能及其对樱桃保鲜效果的影响  

Properties of Antimicrobial Polylactic Acid-Based Film and Its Effect on Cherry Quality Preservation

作　　者：李洋洋 宋文龙 郜海燕 李立 LI Yangyang;SONG Wenlong;GAO Haiyan;LI Li(Engineering Research Center of Food Thermal-Processing Technology,College of Food Sciences and Technology,Shanghai Ocean University,Shanghai 201306,China;Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)

机构地区：[1]上海海洋大学食品学院,食品热加工工程技术研究中心,上海201306 [2]浙江省农业科学院,浙江杭州310021

出　　处：《食品科学》2020年第17期216-222,共7页Food Science

基　　金：“十三五”国家重点研发计划重点专项(2018YFD0401304);上海市地方能力建设专项(19050502000);广东省应用植物学重点实验室开放课题(AB2018018)。

摘　　要：以‘美早’大樱桃为试材,聚乳酸(polylactic acid,PLA)/聚3-羟基丁酸酯-co-4-羟基丁酸酯(poly-3-hydroxybut-yrate-co-4-hydroxybutyrate,P34HB)为基材,硅藻土附载薄荷精油为缓释型抗菌剂,采用流延成膜工艺,制备PLA/P34HB、薄荷精油-PLA/P34HB、薄荷精油/硅藻土-PLA/P34HB 3种活性抗菌膜,对活性抗菌膜性能进行测定,并通过对樱桃在(4±1)℃下贮藏期间保鲜袋内顶空气体组成、质量损失率等理化指标的测定以及低场核磁共振(low field-nuclear magnetic resonance,LF-NMR)分析樱桃内部水分状态的变化,研究不同薄膜和对照(不加薄膜)对樱桃保鲜效果的影响。结果表明:具有硅藻土附载薄荷精油的薄膜相较于PLA/P34HB薄膜氧气透过率从250.37 cm^3/(m^2·d·0.1 MPa)增加到290.45 cm^3/(m^2·d·0.1 MPa),有利于维持樱桃品质。LF-NMR结果表明含有硅藻土附载薄荷精油的薄膜能很好地保持樱桃水分活度,在贮藏12 d时结合水峰面积比是CK组2倍左右,有效延缓了包装中樱桃的腐败,延长了保质期。Three biodegradable packaging films were prepared by a casting method using polylactic acid/poly-3-hydroxybutyrate-co-4-hydroxybutyrate(PLA/P34HB)as the substrate and diatomite loaded with peppermint essential oil as the sustained release antibacterial,namely PLA/P34HB,peppermint essential oil-PLA/P34HB,and peppermint essential oildiatomite-PLA/P34HB films,and their performance was tested.Furthermore,their efficiency in preserving the quality of‘Meizao’sweet cherries was explored by measuring gas composition inside the packages and mass loss percentage during storage at(4±1)℃as well as analyzing the water status of sweet cherries using low-field nuclear magnetic resonance(LF-NMR).Unpackaged samples were used as control for comparison.The results showed that the oxygen transmission rate(OTR)of the film with diatomite loaded with peppermint essential oil was 290.45 cm^3/(m^2·d·0.1 MPa),higher than that of PLA/P34HB film,250.37 cm^3/(m^2·d·0.1 MPa).The improvement in OTR was beneficial to maintain the quality of cherries.LF-NMR analysis showed that the peppermint essential oil-diatomite-PLA/P34HB film maintained the water activity of cherries well.On day 12 of storage,the peak area percentage of bound water was about 2 times as high as that of the control group,which indicates delaying fruit spoilage and prolonging shelf life.

关 键 词：聚乳酸 薄荷精油 樱桃 保鲜 低场核磁共振 

分 类 号：TS255.36[轻工技术与工程—农产品加工及贮藏工程]