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1、---------------------------------------------------------------范文最新推荐------------------------------------------------------壳聚糖-薰衣草精油复合膜的制备与表征摘要：本文研究了壳聚糖膜的制备，壳聚糖-薰衣草精油共混膜的制备，并对共混膜的含水量，水溶性，溶胀度，接触角等性能进行了测定分析，以及力学性能和抑菌性等的测试。结果表明，1.5%的壳聚糖浓度成膜浓度较适宜；壳聚糖膜用中温干燥(55℃)时的机械性能相对
2、较佳,用氢氧化钾中和后的壳聚糖膜性能更好；共混体系中随着薰衣草精油的浓度的增加,膜的水溶性，溶胀性减小，含水量也减小，而抗张强度和延伸率则变大。而抑菌试验发现酸处理的壳聚糖膜的抑菌性比较强，而碱处理后的壳聚糖膜的抑菌效果要差一些，造成这种差异的原因可能是:在酸性条件下壳聚糖分子中的NH3+能与带负电荷的细胞壁发生静电吸附作用,这个过程有利于壳聚糖分子与微生物相结合,从而提高其抗菌性能。而在壳聚糖碱处理膜的制备过程中,碱处理会中和部分带正电荷的氨基,27/27----------------------------------
3、-----------------------------范文最新推荐------------------------------------------------------导致其抗菌性能的降低。关键词：壳聚糖膜；薰衣草精油；性能测定；抑菌性4095Preparationandcharacterizationofchitosan-lavenderessentialoilcompositefilmsAbstract:Thispaperstudiesthepreparationofchitosanfilms,theprepa
4、rationofchitosan-lavenderessentialoilcompositefilms,andthecompositefilmswatercontent,watersoluble,swellingdegree,properties,suchascontactAnglewasdeterminedbyanalysis,andtestingofmechanicalpropertiesandantibacterialetc.Resultsshowthat1.5%oftheconcentrationofchitosan
5、asfilmsconcentrationissuitable;Chitosanfilmsofmediumtemperaturedry(55℃)duetomechanicalperformanceisrelativelypoor,afterusingpotassiumhydroxideandchitosanfilmsperformanceisbetter;Blendingsystemincreasedwiththeincreaseoftheconcentrationoflavenderessentialoil,27/27---
6、------------------------------------------------------------范文最新推荐------------------------------------------------------water-solublefilms,swellingpropertydecreases,andwatercontentalsodecreased,whilethetensilestrengthandelongation.Bacteriostatictestfoundthatacidtre
7、atmentandantibacterialpropertiesofchitosanfilms,andchitosanfilmsafteralkalitreatmentofbacteriostaticeffectisless,thecauseofthisdifferencemightbe:chitosanmoleculesofNH3+underacidconditioncanoccurwiththenegativelychargedcellwallelectrostaticadsorption,theprocessisadv
8、antageoustothechitosanmoleculecombinedwithmicrobes,soastoimproveitsantibacterialproperties.Andintheprocessofthepreparationofchitosanfilmsalkalitr
