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《广州市售泡菜乳酸菌的分离及其特性分析-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、142广东农业科学2015年第9期广州市售泡菜乳酸菌的分离及其特性分析郭衍彪,赵亚玲,蔡俊鹏,。(1.华南理工大学轻工与食品学院,广东广州510641;2.华南理工大学生物科学与T程学院,广东广州510006)摘要:从广州随机市售的泡菜中分离出14株乳酸菌(LAB),并对其溶血性、产生物胺(组胺、酪胺和苯乙胺)、39株不同来源致病菌的抗菌活性、耐酸性、耐胆汁盐等特性进行分析。结果表明:14株乳酸菌在羊血血平板上均不溶血,即一溶血;且均不产组胺(组胺、酪胺和苯乙胺);该14株乳酸菌对39株致病菌表现出不同的抗菌活性,其中P1、P2、Pll菌株
2、抑菌活性较强,分别对34、33、33株表现出抗菌’浯『生,并且P2(上清液)对l3株致病菌达到了最强抑菌活性(+++,抗菌直径>15mm),为达到最强抑菌活性率最高的菌株;耐酸试验表明,P2能耐pH2.5和pH3.5的酸性环境,而其他两株(Pl和Pl1)不耐此酸度;在耐胆汁盐特性方面,P2和Pll能耐受浓度为0.5%、1.0%和1.5%的胆汁盐浓度,而P1不耐受这些胆汁盐浓度。16SrDNA部分序列分子鉴定表明,P2为唾液乳杆菌(相似度为99%)。关键词:乳酸菌;抗菌潘I生;耐酸;耐胆盐;唾液乳杆菌中图分类号:TS255.54文献标识码:A
3、文章编号:1004—874X(2015)09—0142—07l■S0I■atJl00nann■Cn0aractJeri⋯sticsoinl-act·i■caci·dlbacteriafromGuangzhoupicklesGUOYan-biao,ZHAOYa—ling。CAIJun—peng'(1.CollegeofLightIndustryandFoodSciences,SouthChinaUniversityofTechnology,Guangzhou510641,China;2.CollegeofBiosciencesandBioen
4、gineering,SouthChinaUniversityofTechnology,Guangzhou510006,China)Abstract:Inthepresentstudy,14strainsoflacticacidbacteria(LAB)wereisolatedfronGuangzhoupickleswhichwererandomlyboughtfromlocalmarket.Theirinducinghemolysis,producingbiogenicamine(histamine,tyramineandphenyleth
5、ylamine),antimicrobialactivityagainst39differentsourcesofpathogens,acidtolerance,biletoleranceeta1.wereinvestigated.Resultsshowedthatnoneofthe14testedstrainsinducedhemolysisonsheeDbloodagar(一hemolytic);andtheyproducednobiogenicamine(histamine,tyramineandphenylethylamine);t
6、he14isolatedLABstrainshaddifferentantimicrobialactivityagainst39differentpathogens,amongthem,P1,P2andPllhadthestrongerantimicrobialactivity,theyshowed34/39,33/39and33/39positiveantimicrobialactivities,respectively,moreover,P2(cell—freesupernatants)showedthestrongestantimic
7、robialactivity(+++,diameterofinhibitionzone>15mm)on13pathogens,whichwasthehighestgrowthinhibitoryrateofall;concerningacidtoleranceresults,P2strainsshowedacidtoleranceatpH2.5andpH3.5,whiletheothertwostrains(P1andP11)didnot;withrespecttobiletolerance,P2andP11showedbiletolera
8、nceatthebiledensityof0.5%,1.0%and1.5%.whileP1didnot.Finally,analysisofpartial16SrDNAdemon
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