海参微波冻干联合干燥工艺与机理研究

《海参微波冻干联合干燥工艺与机理研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、江南大学博士学位论文海参微波-冻干联合干燥工艺与机理研究姓名：段续申请学位级别：博士专业：农产品加工与贮藏工程指导教师：张慜20090301AbstractSeacucumber(Stichopusjaponicus)isalwayslookedonasadeliciousandexpensedishforitshighnutritionandtonicfunction，andhasveryhighcommercialvalue．Itisoneofthemostexpensivemarineproducts．Sincetheseacucumberc

2、anautolyzeafterleavingseawater,itiSdifficulttopreserveandtransport．Asaresult，morethan80％ofthefreshseacucumberallovertheworldiSprocessedtodehydratedproduct．Becausethemaincomponentofthebodywallofseacucumberiscollagen，dehydrationisdifficultanddeteriorationcanOCCUrduringprocess．Be

3、sides，thedriedproductrehydrationneedsabout3daysforincrustationofbodywallduringdryingprocess．Uptonow,mostofseacucumbersaredehydratedbytraditionaltechniquescalledsalt．dehydrationwhichneedtoaddsalt，boilagainandagainandexposetosolarradiationfor2—3days，andtheproductqualityispoor．An

4、otherusedtechniqueisfreezedryingwhichCanensureverywellproductquality,butneedsmorethan20hoursandtheenergyconsumptionWasveryhigh．Asaresut，anewhybriddryingtechnologybasedonfreezedryingwasintroducedtoreplacethetraditionalfreezedrying．Thenewdryingtechnologyneednotonlyensuregoodprod

5、uctqualitybutalsocostmuchlowerenergyconsumption．Inordertoreducedryingtimeoffreezedrying，atwo·stagecombineddryingtechnology，freezedrying—vaccummicrowavedyringwasused．Itwasfoundthatthenewtechnologycouldreduceabout40％ofdryingtimeoftraditionalfreezedryinganditsproductqualityWasclo

6、setofreezedrying．ConversionmoisturecontentofseacucumberWasthemostimportantparameterofthecombineddryingprocess，andtheoptimaldryingparametersweregottenbyareponsesurfaceanalysismethod．Sothecombineddryingtechnologycanreplacetraditionalfreezedrying，anditalsoCanbeusedtoupgradetheexi

7、xtingfreezedryingproductline．Inordertoreducedryingtimeoffreezedryingandimproveproductquality,microwavewasusedasheatingSOUrCeoffreezedrying，whichcouldbecalledone—stagemicrowavefreezedrying．ElectricfielddistributionofthedryingcavityWassimulatedbyfiniteelementmethod，andthusunifor

8、mheatingcouldbeensured．Relationshipbetweendischargepowerdensi