不同杀菌方法对蛋清物化性质的影响-论文.pdf

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1、生三连Vo1．35，．No．11，2014不同杀菌方法对蛋清物化性质的影响范金波’，王瑞环，周素珍’，吕长鑫’。冯叙桥(1．渤海大学食品科学研究院，辽宁省食品安全重点实验室，辽宁锦州121013；2．中国农业大学，食品科学与营养工程学院，北京100083)摘要：本研究以蛋清液为基质，接种大肠杆菌、沙门氏菌和金黄色葡萄球菌后，比较了高密度CO(DPCD)、高压脉冲电场(PEF)及热处理对这三种菌的杀灭效果以及对蛋清液物化性质的影响，结果表明：对于大肠杆菌和沙门氏茵，DPCD的杀菌效果最佳；热处理杀灭三种细茵达到2-3个对数值，效果优于PEF处

2、理；未处理蛋清液货架期为2d左右，而经过DPCD、PEF和热处理杀菌后，可分别延长蛋清液的货架期至2O、12、14d。DPCD、PEF和热处理也使得蛋清液的物化性质发生一定程度的变化。DPCD处理显著降低了蛋清液的pH及凝胶强度，并且使其电导率大大增加；PEF处理提高了蛋清液的黏度，降低了其凝胶强度，而热处理对其物化性质影响最大，降低了蛋清液的黏度，显著提高了其凝胶强度。关键词：热处理，高密度CO，高压脉冲电场，蛋清液，杀菌Theefectofdifferentsterilizationmethodsonthephysicalandchem

3、icalpropertiesofeggwhiteliquidFANJin—bo，WANGRui—huan，ZHOUSu—zhen，LVChang—xin，FENGXu—qiao，(1．FoodScienceResearchInstituteofBohaiUniversity，FoodSafetyKeyLabofLiaoningProvince，Jinzhou121013，China；2．CollegeofFoodScienceandNutritionalEngineering，ChinaAgriculturalUniversity，Beri

4、ng100083，China)Abstract：Eggwhitewaschosenasasubstrate，inoculatedwithEcoil，SalmonellaandStaphylococcusaureus，andthencomparedthebactericidaleffectsandthechangesofphysicochemicalpropertiesofeggwhiteaftertreatedrespectivelybydensephaseCO2(DPCD)，pulsedelectricalfields(PEF)，andt

5、hermaltreatment．Afterthedeterminationofrelevantindicators．theconclusionscouldbedrawnasfollows：DPCDhadachievedthebestbactericidalefectforEcoilandSaImonel&．ThermaItreatmentcouldreduce2to3logarithmofbacteria．andthebactericidalefectwasbetterthanPEFtreatment．Theshelf—lifeofuntr

6、eatedeggwhitelastedonly2days，whiletheshelf—lifeofeggwhitetreatedbyDPCD．PEF，andthermaltreatmentcombinedwithcoldstoragewereextendedto20days，12daysand14days．DPCD，PEFandheattreatmentalsomadethephysicalandchemicalpropertiesofeggwhitechangeonacertainextent．ThepHvalueandgelstreng

7、thofeggwhitewassignificantlyreducedbyDPCDtreatment，whilethiskindoftreatmeritgreatlyincreaseditselectricalconductivity．PEFtreatmentincreasedtheviscosityofeggwhite，butreduceditsgelstrength．Comparedwiththefresheggwhite，theeffectofheattreatmentonthechangeofphysicalandchemicaIp

8、ropertieswasthelargest，andthiskindoftreatmentreducedtheviscositybutsignificantlyincreased