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聚乙烯壳聚糖-柠檬精油抗菌膜的制备及应用.docx

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聚乙烯壳聚糖-柠檬精油抗菌膜的制备及应用 Abstract: Inthisstudy,anovelantibacterialfilmwaspreparedbyblendingchitosan,polyethyleneandlemonessentialoil.ThefilmwascharacterizedusingdifferenttechniquesincludingFTIR,SEM,XRDandTGA.Theresultsshowedthattheadditionoflemonessentialoildidnotsignificantlyaffectthephysicalandthermalpropertiesofthefilm,butenhancedtheantibacterialactivityofthefilm.Thefilmexhibitedgoodantibacterialpropertiesagainstbothgram-positiveandgram-negativebacteria.Thepreparedfilmhaspotentialapplicationsinthefoodpackagingindustry. Introduction: Food-borneillnessesareamajorconcernworldwide,posingasignificantthreattopublichealthandsafety.Theseillnessesaremainlycausedbythepresenceofmicroorganismssuchasbacteria,viruses,andfungiinfood.Inrecentyears,therehasbeenanincreasingtrendtowardstheuseofnaturalantimicrobialsinfoodpackagingmaterialstoextendtheshelflifeoffoodproductsandreducetheriskoffood-borneillnesses.Onesuchagentisessentialoils,whichpossessantimicrobialpropertiesandhavebeenshowntobeeffectiveagainstvariousmicroorganisms. Chitosanisanaturalbiopolymerthathasbeenextensivelystudiedforitsantibacterialproperties.Itisderivedfromchitin,whichisthesecondmostabundantbiopolymeraftercellulose.Chitosanhasbeenusedinthefoodpackagingindustryduetoitsbiodegradabilityandbiocompatibility.However,chitosanalonehaslimitedantibacterialactivityagainstcertainmicroorganisms. Polyethyleneisawidelyusedpackagingmaterialduetoitslowcost,easeofprocessing,andgoodmechanicalproperties.However,itdoesnothaveanyinherentantibacterialproperties. Lemonessentialoilisanaturalplantextractthathasbeenshowntopossessstrongantibacterialactivityagainstvariousmicroorganisms.Itiscomposedofvariouscomponents,includinglimonene,β-pinene,andγ-terpinene. Inthisstudy,weaimedtoprepareanovelantibacterialfilmbyblendingchitosan,polyethylene,andlemonessentialoil.Thefilmwascharacterizedusingvarioustechniques,anditsantibacterialpropertieswereevaluatedagainstgram-positiveandgram-negativebacteria. Experimental: Materials: Chitosan(MW:70,000-90,000