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1、PreparationacterizationofactivefilmsbasedonchitosanincpatedteapolyphenolsAbstract:Activefilmsbasedonchitosanincpatedteapolyphenolswithdifferentconcentrationsweredeveloped.AttenuatedtotalreflectanceFouriertransfminfrareds

2、pectrometrywasusedtoinvestigatethepotentialinteractionsbetweenchitosanteapolyphenolsinthefilms.Physicalpropertiesofthechitosanfilmsincpatedteapolyphenolsincludingdensitymoisturecontentopacitycolwatersolubilitywatervapper

3、meabilityweremeasured.Antioxidantactivityofthefilmswasacterizedintermsoftotalphenoliccontent22diphenyl1picrylhydrazylfreeradicalscavengingactivity.Theresultsindicatedthattheincpationofteapolyphenolscausedinteractionsbetw

4、eenchitosanteapolyphenolsgaverisetothefilmsdarkerappearance.Aftertheadditionofteapolyphenolsthefilmsshowedincreasedwatersolubilitydecreasedwatervappermeability.Meanwhiletheincpationofteapolyphenolsenhancedthetotalphenoli

5、ccontent22diphenyl1picrylhydrazylfreeradicalscavengingactivityofthefilmsi.e.increasedtheantioxidantactivityofthefilms.Buttheantioxidantactivityofthechitosanfilmsincpatedteapolyphenolsdeclinedwithtime.1.IntroductionThereh

6、asbeenagrowinginterestinrecentyearstodevelopactivepackagingtoimprovefoodsafetyshelflife.Principalactivefoodpackagingsinvolveoxygenscavengingmoistureabsptioncarbondioxideethanolgenerationantimicrobialsystems(Coma2008).One

7、ofthecommonlyusedmethodstodevelopactivefoodpackagingistoincpateactivecompoundsingredientssuchasantioxidantsantimicrobialagentsintopackagingmaterialsprovidingthepackagingsystemadditionalfunctionsthatdonotexistiginally.How

8、everconcernsonconsumerhealthenvironmentalissuesleadresearcherstodeveloptheactivefoodpackagingsbasedonbiodegradablematerialsnaturalsubstances.Chitosananaturalcarbohydratecopolymer[b(14)2acetaoaglucoseb(14)2aminoaglucoseun

9、its]yieldedfromdeacetylationofchitin[polyb(14)Nacetyl2aglucosamine]isabiodegradablenontoxicbiocompatiblepolysacide.Duetoitsantimicrobialactivitychitosanhasagreatpotentialfapplicationsinantimicrobialpackaging(Aider2010Dut

10、taTripathiMehrotraVsconezFlesCamposAlvaradoKanattCherpositivered)b(negativebluepositiveyellow)weremeasured.AstardplateCX2064wasusedasstard.Thetotalcoldifference(DE)chroma(C)werecalculatedasfollows:222LbaE???????22baC??wh

11、ereDLLstardLsampleDaastardasampleDbbstardbsample.ThecolparametervaluesofthestardplateareL94.52a0.86b0.68.Fivemeasurementsweretakenoneachfilmoneatthecenterfouraroundtheperimeter.2.3.4.Watersolubility(WS)TheWSofthefilmswas

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