优良干酪发酵剂用菌株性能研究及其在切达干酪中的应用

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1、AbstractStudyontheCharacteristicsofStrainsofCheeseStarterCulturesanditsApplicationinCheddarCheeseCheddarisahardmaturecheeseandisoneofthemainvarietiesoftheworldcheeseproductionwhichisalsothemaximumcheeseintheworld’Spurchaseandconsumption．Comparedwithotherchees

2、e，Cheddar’SflavorismildwhichismoreeasilyacceptedbyChineseconsumers．WiththedevelopmentofChina’Sdairyindustryandthedietarystructureoptimization，cheeseconsumptiondemandisgrowing．InChina,cheeseindustrialproductionisinthedevelopmentstageandnearlyallthenaturecheese

3、onthemarketisimportedproduct，therefore，thedevelopmentofcheeseinduetryisimminent．Firstproblemwefacedtogetindustrialproductionistoobtainstable，goodperformancecheesestartercultures．Atpresent，foreigncompanieshadcompletedthehi【ghactivityofdirect·vat—strain，andmono

4、polizedthedomesticandforeignmarkets．Ourcountryisstillrelativelybackward．Thisexperimenthasstudiedtwoidentifiedlactococcuslactisstrains’fermentationcharacteristicswhichincludedacid-producingability,extracellularpolysaccharidepropertyandproteolyticactivity．Andhi

5、gh-densitymediumhasbeenimproved．Texture，protelysis，flavorcomponentsandsensoryevaluationofcheddarcheeseproducedwithsinglestrainandcombinationwithlactococcuslactissub．1actisKLDS4．0424andlactococcuslactissub．cremorisKLDS4．0326strainswereevaluatedduringripening．T

6、heexperimentalresultsshowthat：KLDS4．0424isthemainacidproducingstrain；Comparedwiththecommercialstartercultures，theextracellularpolysaccharidepropertyandproteolyticactivityoflaboratorystrainsarerelativelyweak．Wheywasused弱thebasicmediumforlactococcuslactis，added

7、yeastextract，caseinenzymatichydrolysteandcalciumcarbonatetoincreaseviablecount．Thesinglefactortestsresultsshowthat：viablecountofKLDS4．0424respectivelyreachedthehighestlevelatcalciumcarbonate59／L，yeastextract129n—andcaseinenzymatichydrolyste129／L；viablecountof

8、KLDS4．0326respectivelyreachedthehighestlevelatcalciumcarbonate69／m，yeastextract129／Landcaseinenzymatichydrolyste129／L．Basedontheresultsofsinglefactortests，determinetheresponsecenterpointt