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普鲁兰多糖的添加对可食性复合蛋白膜的改性研究.docx

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普鲁兰多糖的添加对可食性复合蛋白膜的改性研究 Abstract Ediblecompositeproteinfilmsarewidelyusedinthefoodindustrytoextendtheshelflifeoffoodandreducetheenvironmentalimpactofpackagingmaterials.However,thesefilmsoftensufferfrompoormechanicalandbarrierproperties.Inthisstudy,weinvestigatedtheuseofpolylacticacid(PLA)andchitosanblendedwiththeadditionofPullulanpolysaccharideasapossiblesolutiontoenhancethepropertiesofsuchfilms.TheresultsshowthattheadditionofPullulancanimprovethemechanicalpropertiesandwatervaporbarrierpropertiesofthecompositeproteinfilms.ThestudysuggeststhattheadditionofPullulancanbeaneffectivewaytoimprovetheperformanceofediblecompositeproteinfilms. Introduction Ediblecompositeproteinfilmsarewidelyusedinthefoodindustryasanalternativetotraditionalsyntheticplasticfilms.Thesefilmshavetheadvantagethattheyarebiodegradable,edible,andproducedfromrenewableresources.However,thebarrierandmechanicalpropertiesofthesefilmsareofteninadequateforpracticalapplications.Inordertoaddressthisissue,researchershavebeenworkingondevelopingmethodstoenhancetheperformanceofthesefilms. Polylacticacid(PLA)isabiodegradableandrenewablethermoplasticpolymerthatiscommonlyusedinfoodpackagingapplications.Chitosan,abiopolymerderivedfromchitin,isalsoacommonlyusedmaterialinediblecompositeproteinfilmsduetoitsfilm-formingproperties.Studieshaveshownthatblendingthesetwomaterialscanimprovethepropertiesofthefilms. Pullulanisawater-solublepolysaccharidethatisproducedbythefermentationofAureobasidiumpullulans.Ithasvariousapplicationsinthefoodindustry,includingasafoodadditive,thickener,andgellingagent.Inthisstudy,weinvestigatetheuseofPullulanasanadditivetoenhancethepropertiesofPLAandchitosanblendfilms. MaterialsandMethods ThematerialsusedinthisstudywerePLA(NatureWorks®),chitosan(Vanson),andPullulan(Sigma-Aldrich).Thesematerialswereusedtoprepareediblecompositeproteinfilms.ThefilmswerepreparedusingacastingmethodbydissolvingPLAandchitosaninaceticacidandmixingwithvariousconcentrationsofPullulan(0%,1%,2%,3%,and4%byweight).Thesolutionswe