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1、海南大学毕业论文(设计)B:黄鳍肠道益生乳酸菌的筛选与鉴定学号:姓名:年级:2009级学院:海洋学院系别:水产系专业:水产养殖学指导教师:摘要黄鳍(Mponoptemsalbas)隶加合鲍冃、合鲍科、黄鳍亚科,为亚热带淡水角类,主要分布在亚洲的屮国、朝鲜、泰国、日本、印度尼西亚等国家,具有良好的药用保健功能,有很高的经济和营养价值。木文以黄鳞为研究对象,通过对其肠道菌群采用“先筛选后分离"的方法,旨在获得黄鳞肠道益生乳酸菌。结果获得3株菌株,命名为LB-1,LB-2,和LB・3,初步确定为乳酸菌。随后对三株乳酸菌进行抗逆性分析,结杲如下:
2、三株乳酸菌均可以在酸性和碱性条件下存活;胰蛋白酶对三株菌的存活率没有影响;在70°C的髙温中三株菌均有一定的耐受性。本文从黄鳍肠道中筛选出具有耐高温、抗酸和抗碱能力强的益生乳酸菌,以其作为黄鳍饲料添加剂应用于生产,以提高黄鳞机体的健康水平和机体的抗病力,从而为促进黄鳞养殖产业的健康发展奠定基础。关键词:黄鳞;肠道益生乳酸菌;筛选AbstractTherice-fieldEel(Monopterusalhus)amemberofthesynbranchiformes,synbranchidae,ricefieldeelsubfamily,i
3、sasubtropicalfreshwaterfishthatoccursmainlyinAsia,includingChina,Japan,Korea,Thailand,Indonesiaandothercountries.Thisfishhascertainpropertiesusefulformedicalpurposesandisalsoofveryhigheconomicandnutritionalvalue.Basedoneelastheresearchobject,throughtheintestinalflorawitht
4、hemethodofnseparationnafterfirstscreening,aimstoobtaineelslivelacticacidbacteriainthegut.theresultsobtainedfromthreestrains,andnamedtheLB-1,LB-2,andLB-3,initiallyidentifiedaslactobacillus,thenanalysisofthreestrainsoflacticacidbacteriaforStressresistance.Thisstudyyieldedth
5、efollowingresults:(1)AcidityResistance:The3strainsoflacticacidbacteriawereabletosurviveinacidicandalkalineconditions;(2)ParenzymeResistance:variationsinparenzymeshadnoeffectonthe3strainsofbacteria;(3)TemperatureResistance:The3strainsofbacteriawereabletotolerateupto70C.The
6、purposeofthisstudyistostudyisstudystrategiesofbuildingtherice-fieldeelsresistancetodiseasethroughnutritionaladditives.Thisstudywillstudysamplesofprobioticlacticacidbacteriaresistanttohightemperature,acidandalkalithatcommonlyoccurintheeel'sintestinaltract,inordertoifcertai
7、nfeedadditivescancombatbacterialgrowthandpromotehealthyeelgrowth.Keywords:Monopterusalbus;theintestinalprobioticlacticacidbacteria;selecte目录H'J311材料与方法11.1材料11.1.1试验动物11.1.2培养基21.1.3试剂21.1.4主要仪器设备21.2方法31.2.1样本的釆取31.2.2菌种的分离及初筛31.2.3乳酸菌的抗逆性试验42结果52.1乳酸菌筛选结杲52.2乳酸菌抗逆性实验结果7
8、1pH值对乳酸菌的影响72.2.2蛋白酶对三株乳酸菌存活率的彩响72.2.3高温对乳酸菌存活的影响83结论与讨论9致谢11参考文献12黄鳍肠道益生乳酸菌的筛选与鉴定刖S黄鳍(Mponoptem