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ID:39675612
大小:723.25 KB
页数:6页
时间:2019-07-09
《干燥方法对细菌纤维素膜特性及结构的影响》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、干燥方法对细菌纤维素膜特性及结构的影响12,*任泽祺,张东杰(1.黑龙江省实验中学,黑龙江哈尔滨150001;2.黑龙江八一农垦大学食品学院,黑龙江大庆163000)摘要:本文主要通过测定膜的厚度、吸水率、水蒸气透过率、透光率、力学性能等指标,研究三种干燥方法(直接干燥法、冷冻干燥法和匀浆后干燥法)对木醋杆菌制备的细菌纤维素膜特性的影响,并利用红外光谱、电镜扫描等设备分析细菌纤维素膜的结构。结果表明:干燥方法明显影响细菌纤维素膜的特性,冷冻干燥法制备的膜厚度值、吸水率和水2蒸气透过率分别为0.47mm、88.14%、53.28g/mh,均显
2、著高于其他两种样品(p<0.05);直接干燥法制备的膜的拉伸强度为46.7MPa、冷冻干燥法制备的细菌纤维素膜的断裂伸长率为4.48%,显著性高于其他两者(p<0.05);直接烘干样品的透光性最好,且直接烘干样品和匀浆后干燥样品的透光率同波长呈正相关;直接干燥法、冷冻干燥法和匀浆后干燥法孔隙率分别为35.21%、69.27%、8.91%,且差异性显著(p<0.05)。细菌纤维素膜的扫描电镜结果显示:冷冻干燥样品结构松散、存在孔洞结构,直接烘干和匀浆后干燥样品结构较为紧致、孔洞较小,且扫描电镜结果与孔隙率结果相一致。红外光谱分析结果表明:三种
3、样品均具有纤维素特征吸收峰,但峰尖锐程度和面积的大小受干燥方法影响较大。因此,干燥方法直接影响细菌纤维素膜的结构,从而影响膜的特性。关键词:干燥方法,细菌纤维素膜,特性,结构Effectofdryingmethodonpropertiesandstructureofbacterialcellulosefilm12,*RENZe-qi,ZHANGDong-jie(1.HeilongjiangExperimentalHighSchool,Harbin150001,China;2.HeilongjiangBayiAgriculturalRecla
4、mationUniversity,CollegeofFoodScience,Daqing163000,China)Abstract:Effectsofdryingmethods(directdrying,freezedrying,andhomogenizationdrying)ontheproperties(thickness,waterabsorptionwatervaporpermeability,lighttransmittance,mechanicalproperties,andsoon)ofbacterialcellulosefi
5、lmpreparedbyAcetobacterxylinuswereinvestigatedbymeasuringthethickness,waterabsorption,watervaporpermeability,lighttransmittanceandmechanicalpropertiesoffilmsstudied.ThefilmwaspreparedbyAcetobacterxylinus.Meanwhile,thestructureofbacterialcellulosefilmwasanalyzedutilizingbyi
6、nfraredspectroscopyandscanningelectronmicroscopy(SEM)inordertorevealthemechanismofdryingmethodtothefilmproperties.Therewasasignificanteffectofdryingmethodonthepropertiesofbacterialcellulosefilms.Thethickness,waterabsorptionandwatervaporpermeabilityoffreezedryingfilmwere0.4
7、7mm,288.14%and53.28g/m,respectively,whichwereapparentlyhigherthanthatoftheotherfilms(p<0.05).Thetensilestrengthofthedirectdryingfilmwas46.7MPa,andthebreakelongationofthefreezedryingfilmwas4.48%,whichwereapparentlyhigherthanthatoftheotherfilms(p<0.05).Thelighttransmittanceo
8、fdirectdryingfilmwasbest,andtherewasapositivecorrelationbetweenthelighttransmittanceandwa
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