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1、现代食品科技ModernFoodScienceandTechnology2013,Vol.29,No.12荔枝汁经乳酸菌发酵后营养品质的变化及贮藏稳定性研究1,21111,21,3郑欣,余元善,吴继军,徐玉娟,肖更生,程银棋(1.广东省农业科学院蚕业与农产品加工研究所,广东广州5106101)(2.江西农业大学生物科学与工程学院,江西南昌330045)(3.华中农业大学食品科学技术学院,湖北武汉430023)摘要:研究了荔枝汁分别经干酪乳杆菌、保加利亚乳杆菌和肠膜状明串珠菌发酵后及4℃贮藏期间乳
2、酸菌活菌数、主要营养品质和色泽的变化。研究表明:三种乳酸菌都能在荔枝汁中很好的生长,发酵12h后,活菌数均达到最大值(9.0个对数以上);三种菌对荔枝汁中糖和有机酸的转化和利用有明显差异,其中干酪乳杆菌和保加利亚乳杆菌发酵荔枝汁后产生了高达37.5g/L的胞外多糖;荔枝汁分别经三种乳酸菌发酵后,多酚和Vc含量均变化不显著,L*值均明显下降(P<0.05),且色泽变得更白。另外,三种菌发酵荔枝汁在4℃贮藏期间,没有明显的后发酵发生,但经过28d的低温贮藏后,肠膜状明串珠菌的活菌数下降到了7.0对数
3、以下,而干酪乳杆菌和保加利亚乳杆菌仅仅下降了不到0.5个对数。关键词:乳酸菌;发酵;荔枝汁;贮藏稳定性文章篇号:1673-9078(2013)12-2909-2914QualityChangesofLitchiJuiceafterFermentationandtheStabilityduringLow-temperatureStorageZHENGXin1,2,YUYuan-shan1,WUJi-jun1,XUYu-juan1,XIAOGeng-sheng1,2,CHENGYin-qi1,3(1
4、.Sericulture&Agri-foodResearchInstitute,GuangdongAcademyofAgriculturalSciences,Guangzhou510610,China)(2.CollegeofBioscience&Bioengineering,JiangxiAgriculturalUniversity,Nanchang330045,China)(3.CollegeofFoodScienceTechnology,HuaZhongAgriculturalUniver
5、sity,Wuhan430023,China)Abstract:Inthisstudy,litchijuicewasfermentedat30℃byprobioticsofLactobacilluscasei,LactobacillusbulgaricusandLeuconstocmesenteroides,andthechangesofmicrobialcountandqualityoffermentedlitchijuiceduringstorageat4℃werealsoinvestiga
6、ted.Resultsshowedthatthethreelacticacidbacteriagrewrapidlyinlitchijuice,andreceivedthehighestnumber(above9.0log)afterfermented12h.Thethreelacticacidbacteriashowedobviousdifferenceinutilizingsugarandorganicacidoflitchijuice,whereLactobacilluscaseiandL
7、actobacillusbulgaricusproducedasmuchas37.5g/Lexopolysaccharides.Moreover,after12hfermentation,thepolyphenolandVccontentsappearednosignificantchange(p>0.05).ButL*valuesweresignificantlydecrease(p<0.05),andthecolorbecamemorepaleinallfermentedlitchijuic
8、e.Duringstorageof28dat4℃,nofurtherfermentationwasfoundinallfermentedlitchijuice,butthenumberofLeuconostocmesenteroidesdroppedtolessthan7log,whereasLactobacilluscaseiandLactobacillusbulgaricusonlydecreased0.5log.Keywords:Lacticacidbacteria;fermentatio