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1、---------------------------------------------------------------范文最新推薦------------------------------------------------------殼聚糖-薰衣草精油復合膜的制備與表征摘要：本文研究了殼聚糖膜的制備，殼聚糖-薰衣草精油共混膜的制備，并對共混膜的含水量，水溶性，溶脹度，接觸角等性能進行了測定分析，以及力學性能和抑菌性等的測試。結果表明，1.5%的殼聚糖濃度成膜濃度較適宜；殼聚糖膜用中溫干燥(55℃)時的機械性能相對
2、較佳,用氫氧化鉀中和后的殼聚糖膜性能更好；共混體系中隨著薰衣草精油的濃度的增加,膜的水溶性，溶脹性減小，含水量也減小，而抗張強度和延伸率則變大。而抑菌試驗發(fā)現酸處理的殼聚糖膜的抑菌性比較強，而堿處理后的殼聚糖膜的抑菌效果要差一些，造成這種差異的原因可能是:在酸性條件下殼聚糖分子中的NH3+能與帶負電荷的細胞壁發(fā)生靜電吸附作用,這個過程有利于殼聚糖分子與微生物相結合,從而提高其抗菌性能。而在殼聚糖堿處理膜的制備過程中,堿處理會中和部分帶正電荷的氨基,27/27----------------------------------
3、-----------------------------范文最新推薦------------------------------------------------------導致其抗菌性能的降低。關鍵詞：殼聚糖膜；薰衣草精油；性能測定；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、------------------------------------------------------------范文最新推薦------------------------------------------------------water-solublefilms,swellingpropertydecreases,andwatercontentalsodecreased,whilethetensilestrengthandelongation.Bacteriostatictestfoundthatacidtre
7、atmentandantibacterialpropertiesofchitosanfilms,andchitosanfilmsafteralkalitreatmentofbacteriostaticeffectisless,thecauseofthisdifferencemightbe:chitosanmoleculesofNH3+underacidconditioncanoccurwiththenegativelychargedcellwallelectrostaticadsorption,theprocessisadv
8、antageoustothechitosanmoleculecombinedwithmicrobes,soastoimproveitsantibacterialproperties.Andintheprocessofthepreparationofchitosanfilmsalkalitr
