The invention provides a method for producing lactic acid Streptococcus bovis, including SEQ NO.1 the nucleotide sequences shown below, as well as the S.bovis separation method: 1) liquid enrichment culture preparation containing soluble starch, and its high temperature sterilization after deaeraing seal cooling, adjusting pH to 6.5 to 6.8 to 2); according to the acquisition of anaerobic bacteria source sterile 1:30 ~ 70 and the proportion of step 1) in preparation of the enrichment medium in liquid mixed anaerobic culture container, 37 DEG C to shake culture for at least 24 hours after the erection of anaerobic culture vessel, to static culture for at least 24 hours; 3) was prepared from culture medium. High temperature sterilization after deaeraing cooling in the anaerobic environment, adjusting pH to 6.5 to 6.8 pouring plate; 4) out of step 2) in the culture vessel in sediment, coated on the isolation plate, under anaerobic conditions 37 to 39 DEG C light training 24 to 36 hours, pick the surface wet A colony of colonies with lustrous, creamy white colonies. The method is simple, efficient and selective.
【技术实现步骤摘要】
一种产乳酸牛链球菌及其分离方法
本专利技术涉及一种牛链球菌,尤其涉及一种能够利用淀粉发酵产出混合酸的产乳酸牛链球菌,以及该菌的体外分离方法,属于微生物
技术介绍
牛链球菌(Streptococcusbovis)是瘤胃主要的乳酸产生菌,在饲喂高精料饲粮导致瘤胃乳酸中毒的重要诱因。从反刍动物瘤胃中分离培养牛链球菌,研究其发酵产酸通路及主要影响因素将为寻找抑制其乳酸产生的方法(如:抑制型添加剂的研发等)提供理论参考,从而在生产上达到通过调控牛链球菌乳酸的产生来缓解反刍动物瘤胃乳酸中毒的目的。另外,利用牛链球菌产生混合酸的特点,可以将分离的瘤胃源牛链球菌用于反刍动物青贮饲料发酵,改进单纯使用乳酸菌作为发酵菌株的单一化的发酵模式。目前,有关牛链球菌的研究主要集中在检测瘤胃酸中毒情况下牛链球菌菌群数量变化情况。Wang,etal.研究结果发现,牛链球菌的数量在瘤胃酸中毒后剧增,直接揭示了其在诱导瘤胃酸中毒中的关键作用(WangH,PanX,WangC,etal.Effectsofdifferentdietaryconcentratetoforageratioandthiaminesupplementationontherumenfermentationandruminalbacterialcommunityindairycows[J].AnimalProductionScience,2015,55(2):189-193)。国外,特别是欧洲国家借助于高效的细菌库资源共享平台,研究开发了诸如莫能菌素等有效杀灭瘤胃牛链球菌的抗生素制剂(McGuffeyRK,Ric ...
【技术保护点】
一种产乳酸牛链球菌,其特征在于,所述产乳牛链球菌的核苷酸包括如序列表中SEQ NO.1所示之序列。
【技术特征摘要】
1.一种产乳酸牛链球菌,其特征在于,所述产乳牛链球菌的核苷酸包括如序列表中SEQNO.1所示之序列。2.一种如权利要求1所述的产乳酸牛链球菌的分离方法,其特征在于,主要包括如下步骤:(1)制备富集培养基液:以水为溶质,向其中加入质量比为1.0%蛋白胨,0.5%酵母提取物,1.0%牛肉提取物,1.0%可溶性淀粉,0.2%K2HPO4,0.1%吐温80,0.02%MgSO4·7H2O,0.005%MgSO4·H2O,0.2%柠檬酸铵,0.5%C2H3NaO2,并向其中加入终浓度为20mg/L的刃天青钠,在将配置的富集培养基液高温灭菌除氧后密封冷却,调节pH为6.5到6.8;(2)菌源稀释:将无菌厌氧采集的菌源按照1:30~70的比例与步骤(1)中所制备获得的富集培养基液混合于厌氧培养容器中,于37℃震荡培养至少24小时后,竖立厌氧培养容器,继续静置培养至少24小时;(3)制备固体分离培养基:以水为溶质,向其中加入质量比为1.0%蛋白胨,0.5%酵母提取物,1.0%牛肉提取物,1.0%可溶性淀粉,0.2%K2HPO4,0.1%吐温80,0.02%MgSO4·7H2O,0.005%MgSO4·H2O,0.2%柠檬酸铵,0.5%C2H3NaO2,并向其中加入1.5%琼脂糖,在将配置的分离培养基高温灭菌除氧后在厌氧环...
【专利技术属性】
技术研发人员:王洪荣,陈连民,王梦芝,喻礼怀,罗阳,沈宜钊,丁洛阳,
申请(专利权)人:扬州大学,
类型:发明
国别省市:江苏,32
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