前处理方式对预腌萝卜果胶酶活性和脆度的影响.pdf

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1、三艺}蔓求Z．33，No．202012前处理方式对预腌萝卜果胶酶活性和脆度的影响汪欣，汪立平·，吴正钧，艾连中，赵勇(1．上海海洋大学上海水产品加工及贮藏工程技术研究中心，上海201306；2．光明乳业股份有限公司乳业生物技术国家重点实验室，上海600597)摘要：以白萝1、为材料．研究了热风干燥、热烫和高盐预腌渍等泡菜常用的前处理方式对其果胶酶活性的影响．同时观察原料脆度变化。实验表明，在模拟秋季室外晾晒条件即30℃热风干燥条件下，萝l、果胶酶活性先升高后降低，同时萝卜脆度也有不同程度下降，跟失水量密切相关，萝卜最佳失水量为35％．此时脆度下降约4

2、5％．果胶酶活性降低约20％；在热烫条件下，温度越高，萝果胶酶活性降低越快，最佳热烫条件为6OcC、10min，此时原料脆度降低15％．果胶酶活性降低约27％；盐浓度对果胶酶活性的影响有显著影响，在低浓度盐条件下(NaCI<4％)，盐腌渍对酶活有促进作用，在高浓度盐条件下(NaC

3、>6％)，盐腌渍对果胶酶酶活有显著抑制作用。综合考虑前处理方式对萝卜原料果胶酶活性的抑制和脆度的影响，高盐预腌渍效果更好、关键词：干燥，热烫，果胶酶，脆度Effectofpretreatmentmethodtopickledradishesontheactivityofpe

4、ctinaseandbrittlenessWANGXin，WANGLi-ping’’，WUZheng-jUII2，AILian—zhongz,ZHAOYong(1．ShanghaiEngineeringResearchCenterofAquaticProductProcessing，ShanghaiOceanUniversity，Shanghai201306，China2．BrightDairyStateKeyLaboratoryofDairyBiotechnology，Shanghai600597，China)Abstract：Radisheswe

5、reusedasrawmaterialtostudyonthreecommonlypretreatmentmethodsincludingheated—airdrying，blanchingandhigh-saltpickling．activitiesofpectinaseandbrittlenesswereinvestigated．Theresultshowedthat，intheconditionsof30ochot—airwhichimitatedtheoutsidetemperatureinautumn．activitiesofpectina

6、seofradishesroseatbeginningandthendeclined．thebrittlenessofradishesdeclinedtoo．changeswerecloselyrelatedtothewaterloss．1osing35％waterwastheoptimumcondition．asaresultofthatthebrittlenessdawnto45％andthetheactivityofpectinasefalt20％．Differentconditionsofblanchinghadanenormousimpac

7、tontheactivitiesofpectinaseTheresultindicatedthattheoptimumconditionwas6O℃．remaining10mjn，undertheseconditions．asaresultofthatthebrittlenessdawnto15％andtheactivityofpectinasefelI27％SodiumconcentrationhadsignificanteffectontheactivityofpectinaseInthelow—saltcondition(NaC／<4％)，pi

8、cklingcouldincreasetheactivityofpectinase，inthehigh—saltcondition(NaCI>6％)，picklingcouldreducetheactivityofpectinase．Thesefactorstakentogether，pretreatmentmethodsinfluencedontheactivityofpectinaseandbrittleness．Giventheinfluenceontheactivityofpectinaseandbrittlenessbydifferentp

9、retreatmentmethods，high-saltpicklinginthebeginningwast