Effect of bile salts and bile acids on human gastric mucosal epithelial cells

Objective：To explore the effect of bile salt and bile acid on cultured eternalized human gastric mucosa epithelium GES-1 cells. Methods：Cultured eternalized human gastric mucosa epithelium GES-1 cells were treated with media containing 6 different kinds of bile salts and 3 different kinds of bile acids and their mixture with different concentrations： GCDC（glycochenodeoxychoμte）, GDC （glycodeoxychoμte）, GC（glycochoμte）, TCDC（taurochenodeoxychoμte）, TDC（taurodeoxychoμte）, TC （taurochoμte）, LCA （lithocholicacid）, CA（cholic acid）, DCA（deoxycholic acid）（50 μ mol/L,250 μ mol/L,500 μ mol/L,1000 μ mol/L）, DY（mixture of bile salts） and DS（mixture of bile acids）（250 μ mol/L,500 μ mol/L,1000 μ mol/L,1500 μ mol/L, 2000 μ mol/L）, in comparison with the control group（in normal media without bile salts and bile acids）. Cell proliferation was assessed by MTT（3-[4,5-Dimethylthiaolyl]-2,5- diphenyl-tetrazolium bromide） assay for 72 hours with different concentrations and the apoptotic cells were assayed by flow cytometry （FCM） with Annex V-FITC conjugated with propidium iodide（PI） staining for 24 hours with different concentrations（1500,2000 μt mol/L）. Results：There was no significant difference in morphology and cell proliferation in GC group after 24-72 h. Low concentration（50 μ mol/L） of GCDC, GDC, TCDC, TDC and TC accelerated gastric epithelial cell growth in a dosage-time dependent manner. At middle concentration （250-500 μ mol/L）, it showed positive effect after 24-48 h, while negative effect after 72 h. At high concentration（1000 μ mol/L）, it accelerated gastric epithelial cell growth after 24h and show consistent inhibition even leading to necrosis after 48-72 h. LCA and CA showed a positive effect on the concentration of 50 μ mol/L after 24-72 h, while 250-1000 μ mol/L showed a trend towards apoptosis after 24-72 h. At 50-500 μmol/L, DCA showed proliferation after 24 h and apoptosis after 48-72 h, but showed necrosis after 24-72 h at 1000 μmol/L. DY and DS could facilitate normal gastric mucosa epithelial cell growth at low concentration （250-500 μ mol/L）, however at 1000-2000 μ mol/L the trend shifted from apoptosis to necrosis. FCM with Annexin-V conjugated with PI staining revealed that GCDC, GDC, GC, TCDC, TDC, TC, LCA, CA, DCA, DY and DS induced apoptosis of human gastric mucosal epithelial cells. They were all significantly higher than that of the control（P 〈 0.05）, but there was no significant difference in GC group （P 〉 0.05）. The bile salts induced apoptosis in a time-dose-dependent manner. Conclusion：Our results suggested that bile acid and bile salt is the trigger of injury in human gastric mucosal epithelial cells.

Alleviative effects of Bacillus coagulans strains on irritable bowel syndrome-unraveling strain specificity through physiological and genomic analysis

The high intraspecies heterogeneity of Baciillus coagulans leads to significant phenotypic differences among different strains.Thus,6 B.coagulans strains were tested in the present study using an irritable bowel syndrome(IBS)animal model to determine whether the IBS-alleviating effects of B.coagulans strains are strain-specific.The results of this study showed that the ingestion of B.coagulans GBI-30,6086,and B.coagulans CCFM1041 significantly alleviated IBS symptoms in mice.In contrast,other B.coagulans strains showed no or limited alleviating effects on IBS symptoms.According to our experimental results,the two main common features of these strains were as follows:1)The resistance of vegetative cells to bile salts,and 2)ability to synthesize specific lipids and secondary metabolites.Screening strains based on these two indicators may greatly reduce costs and provide a basis for mining new functional B.coagulans strains.Our results also suggest that administration of B.coagulans could significantly regulate microbiota dysbiosis in animal models.Moreover,the close relationships between the gut microbiota,gut microbiota metabolites,and IBS were further confirmed in this study.

High-fat-induced intestinal permeability dysfunction associated with altered fecal bile acids

AIM： To investigate whether high-fat-feeding is associ- ated with increased intestinal permeability via altera- tions in bile acid metabolism.METHODS： Male C57BI/6J mice were fed on a high-fat （n = 26） or low-fat diet （n = 24） for 15 wk. Intestinal permeability was measured from duodenum, jejunum, ileum and colon in an Ussing chamber system using 4 kDa FITC-labeled dextran as an indicator. Fecal bile ac- ids were analyzed with gas chromatography. Segments of jejunum and colon were analyzed for the expression of farnesoid X receptor （FXR） and tumor necrosis factor

Experimental study on the relationship of bile acids and myocardium damage in obstructive jaundice

AIM To investigate the morphologic changes of the myocardium and its relationship to serum bile acids in obstructive jaundice. METHODS Part Ⅰ: 35 rats were randomly assigned to three groups: Group Ⅰ (BDL1, n =11), the common bile duct (CBD) was ligated and severed and killed after one week. Group Ⅱ (BDL2, n =11), the CBD was ligated and severed and killed after two weeks. Group Ⅲ (SO, n =13), the CBD was simply isolated. The hearts were taken for morphologic studies and blood was taken to determine the total serum bile acids (TAB). Part Ⅱ: 13 rats received gastric intubation of 10% 4ml/kg of sodium cholate, and their serum TBA and the morphologic changes of the heart were examined. RESULTS One to two weeks after the CBD was ligated and severed, the mitochondrium of the myocardium was damaged and the serum TBA obviously increased. When the rats were administered sodium cholate to make their peak blood concentration close to the average blood concentration in BDL2, their myocardium was damaged in a similar degree. CONCLUSION The myocardium was damaged in obstructive jaundice and the endogenous bile acids was one of the factors.

Cloning of Bile Salt Hydrolase Gene and Its Expression in Lactic Acid Bacteria

According to the sequence of the bile salt hydrolase （BSH） gene of Bifidobacterium and the restriction enzyme cutting sites of expression vector pNZ8148, primers were designed and the bile salt hydrolase （BSH） gene was gotten from Bacillus bifidus ATCC 29521 by PCR. BSH gene was inserted into lactic acid bacteria expression vector pNZ8148 to construct the recombinant pNZ8148-BSH. The recombinant pNZ8148-BSH was transferred into lactic acid bacteria NZ9000 with electrotransformation method. And the recombinant which could express BSH protein was obtained. It was identified by SDS-PAGE electrophoresis and activity verification. The result could provide a rationale reference for expressing BSH in lactic acid bacteria.

Bile acids in serum and bile of patients with cholesterol gallstone

IM To analyze serum bile acids and biliary lipids of patients with cholesterol gallstone(CS) and explore the relationship between deoxycholic acid (DCA) and CS disease.METHODS Analysis of bile acids in serum was done with gaschromatography in two groups: CS group (n=151) and control group (n=256). Serum bile acids and biliary lipids were also studied in 90 matched samples..RESULTS The serum DCA was 0955μmol/L±0078μmol/L in CS group, which was more than that of control group (0696μmol/L±0047μmol/L), P<001. The ratio of DCA/chenodeoxycholic acids (CDCA) was 176±030 in CS group, about two times that in control group (092±014). The mole percent of DCA in bile was positively related to cholesterol saturation index (CSI) (P<001) and the mole percent of CDCA in bile negatively to CSI (P=001). There was correlation between the mole percent of DCA, CDCA and cholic acid in bile and in serum.CONCLUSION It is suggested that DCA is lithogenic and the increased amount of DCA or the ratio of DCA/CDCA in serum may be one of the features of cholesterol gallstone patients.

拉曼积分球光谱仪对盐水溶液中B(OH)_(3)的定量分析

不同溶液体系中硼的赋存形态及其化学分布规律一直以来是研究者关注的重点,它对深入开展硼酸盐溶液结构化学、过饱和非平衡态以及硼酸盐矿物沉积机制等研究具有重要的指导意义。针对目前拉曼光谱仪对溶液中硼氧配阴离子官能团响应信号弱、灵敏度低,不利于定量化视角阐述硼氧配阴离子间的作用机理等问题,研究了拉曼积分球光谱仪对硼酸溶液的定量分析方法,运用DOE部分因子实验设计,阐述了NaCl、MgCl_(2)、KCl和MgSO_(4)等共存盐类之间的交互作用对B(OH)_(3)拉曼定量分析的影响规律,建立了盐水溶液中B(OH)_(3)的Raman回归模型。结果表明,拉曼积分球光谱仪可显著增大硼酸溶液的拉曼光谱强度,提高信噪比,检出限为常规拉曼光谱的70倍,在0~6 g·L^(-1)硼酸线性范围内相关系数为0.9991,测定相对误差为-2.5%;盐水溶液中B(OH)_(3)含量经回归方程校正后相对误差绝对值小于3%,可用于低浓度硼酸的准确定量分析,也为定量化探究盐卤复杂体系中多硼物种化学形态分布规律提供一定借鉴。

三种浸种剂对Na_(2)SO_(4)胁迫下小麦种子萌发期耐盐性的影响

为了解黄腐酸、褪黑素、水杨酸三种浸种剂对硫酸盐胁迫下小麦种子萌发期耐盐性的调节效应,分别采用不同浓度的黄腐酸(0.5、1.0和1.5 g·L^(-1))、褪黑素(0.01、0.05和0.10 mmol·L^(-1))、水杨酸(0.1、0.5和1.0 mmol·L^(-1))对小麦进行浸种处理,随后与未处理的小麦种子一并采用100 mmol·L^(-1)Na_(2)SO_(4)溶液培养,测定各处理下小麦种子萌发期的生长生理指标,并通过主成分分析综合评价其耐盐性。结果表明,0.5~1.5 g·L^(-1)的黄腐酸、0.01~0.10 mmol·L^(-1)褪黑素、0.1~0.5 mmol·L^(-1)水杨酸浸种均提升了小麦根系活力、体内抗氧化酶活性,降低了小麦体内超氧阴离子自由基(O_(2)^(-·))产生速率及丙二醛(MDA)含量,缓解了盐分对小麦种子萌发的胁迫程度,增强了小麦种子萌发期的耐盐性,促进了小麦的萌发生长。其中,1.5 g·L^(-1)的黄腐酸、0.10 mmol·L^(-1)的褪黑素以及0.5 mmol·L^(-1)的水杨酸浸种效果最优,分别使Na_(2)SO_(4)胁迫下小麦发芽势提升了27.25、21.25和13.25个百分点,发芽率提升了21.50、15.00和5.50个百分点,株高提升了45.45%、26.48%和13.64%,鲜重提升了18.25%、11.11%和8.73%,可作为小麦种子萌发期抵抗硫酸盐胁迫的较优浸种剂。

血浆胆汁酸在肝肿瘤中的差异分析及应用价值

目的分析原发性肝癌与转移性肝癌患者血浆胆汁酸水平及其与临床指标的相关性,并评估其联合AFP对于原发性肝癌的诊断价值。方法纳入2020年8月—2021年9月于上海中医药大学附属曙光医院就诊且具有组织病理学及影像学明确的75例原发性肝癌患者及79例转移性肝癌患者,采集外周血并分别分离血清及血浆,比色法及色谱法检测生化指标,电化学发光免疫分析法检测肿瘤标志物水平,高效液相色谱-串联质谱法检测胆汁酸含量。符合正态分布的计量资料两组间比较采用成组t检验,不符合正态分布的计量资料两组间比较采用Mann-Whitney U检验。相关性检验采用Spearman相关分析。临床诊断效能采用受试者工作特征曲线(ROC曲线)评估。结果原发性肝癌组患者TC、TG、LDL-C及载脂蛋白(Apo)B显著低于转移性肝癌组患者,差异均具有统计学意义(U值分别为1598、1255、909、889,P值均<0.05)。原发性肝癌组患者AFP显著高于转移性肝癌组患者,癌胚抗原(CEA)显著低于转移性肝癌组患者,差异均具有统计学意义(U值分别为1873、926,P值均<0.05)。原发性肝癌组患者总胆汁酸(TBA)、胆酸(CA)、鹅脱氧胆酸(CDCA)、熊脱氧胆酸(UDCA)、牛磺胆酸(TCA)、牛磺鹅脱氧胆酸(TCDCA)、甘氨胆酸(GCA)、甘氨鹅脱氧胆酸(GCDCA)、牛磺熊脱氧胆酸(TUDCA)、甘氨熊脱氧胆酸(GUDCA)均显著高于转移性肝癌患者,脱氧胆酸(DCA)显著低于转移性肝癌患者,差异均具有统计学意义(P值均<0.05)。总人群中TBA、CDCA、GCA、GCDCA、GUDCA、TCA、TCDCA及TUDCA含量与AFP水平呈显著正相关(P值均<0.05)。原发性肝癌患者中GCA、TCA、TCDCA及TUDCA含量与AFP水平呈显著正相关(P值均<0.05)。AFP+TCA+GCA+TCDCA联合检测的AUC为0.822(95%CI:0.746~0.898,P<0.0001),效能最高。结论原发性肝癌与转移性肝癌患者血浆胆汁酸含量具有显著差异,差异性胆汁酸与肝损伤及AFP升高密切相关,联合AFP对原发性肝癌具有更优的临床诊断价值。

细胞焦亡:连接肠道菌群与肝脏疾病的新桥梁

自肠-肝轴的概念被提出以来,已有大量研究着眼于探索肠道菌群和肝病之间的联系,但以细胞焦亡为枢纽,探究肠-肝串扰的内在机制的观点仍处于萌芽阶段。本文主要通过叙述了肠道菌群失调通过影响黏膜屏障的完整性和胆汁酸的代谢,诱导细胞焦亡,进而影响肝脏相关疾病的发生和进展的过程,并总结出肠道菌群失调通过诱导NLRP3/AIM2/Caspase-1依赖型、Caspase-4/11/GSDMD依赖型和Caspase-3/GSDME依赖型细胞焦亡以影响肝脏相关疾病的观点。希望通过建立细胞焦亡与肠-肝免疫串扰之间的联系,为未来肝病的诊治提供新的思路和靶点。

冷冻干燥对益生菌传代稳定性的影响

益生菌随着传代的进行,菌株的产酸能力、耐胆盐能力、耐酸能力和抗氧化能力产生变化。冷冻干燥是菌株常用的保藏方法,对菌体转录水平影响较大,能够临时改变菌株的多种特性。文章以植物乳杆菌M547、M621、M748、戊糖乳杆菌M750为研究对象,探究冷冻干燥对菌株传代稳定性的影响。结果表明,冷冻干燥影响菌株的耐胆盐稳定性,对产酸能力、耐酸能力、抗氧化能力无显著影响。

一株具有缓解酒精性肝损伤的发酵粘液乳杆菌及其功效评价研究

该研究从新疆奶疙瘩中分离鉴定一株发酵粘液乳杆菌(Limosilactobacillus fermentum)WHH2438,以商业菌株鼠李糖乳酪杆菌(Lacticaseibacillus rhamnosus)GG为对照,从抗氧化特性、改善肠道屏障功能、耐受性和黏附性等方面,进行体外功效评价。之后以C57BL/6 J小鼠为实验对象,使用液体酒精饲料建立慢性酒精性肝损伤模型,验证菌株的缓解酒精性肝损伤功能。结果显示,该发酵粘液乳杆菌清除DPPH自由基和羟自由基能力显著优于LGG,在保护肠道细胞和肠道屏障方面也有优秀的能力。通过酒精性肝损伤功能动物剂量效价实验,发现菌株WHH2438高剂量组和灭活组的血清谷丙转氨酶和谷草转氨酶相比模型组明显下降、肝脏甘油三脂和还原型谷胱甘肽下降且接近对照,总体有较明显的改善效果,说明该菌株降低酒精对肝脏的氧化损伤,延缓酒精性脂肪肝的形成,具有良好的缓解酒精性肝损伤功能。综上,发酵粘液乳杆菌WHH2438具有良好的缓解慢性酒精性肝损伤功能,且菌株特性优良,能顺利到达肠道,并黏附于肠道上皮细胞,发挥益生功效。

Influence of gut microbiome composition on effect variations of anti-cholesterol treatment among individual mice

This study investigated if the variation in the effect of anti-cholesterol(AC)treatment on individual mice are related to gut microbiome composition.The bile salt hydrolase(BSH)activity of 23 commercial fermented milk products was examined to select a fermented milk product for AC treatment.Mice were fed to different diets for 6 weeks:high-fat(60%of total calories from fat;D1),high-dietary fibre(20%cellulose;D2),and low-fat(17.2%of total calories from fat;D3)diets to change their gut microbiomes.Subsequently,faecal microbiome was transplanted(FMT)into mice treated with high cholesterol diet contained 2%cholesterol,followed by AC or non-AC(sterile tap water,STW)treatments.Control groups with normal(NC)and highcholesterol diets(PC)were prepared for both AC and STW treatment.All experimental groups were subjected to serum and liver cholesterol,cholesterol metabolism-related(CMR)gene expression,and intestinal microbiome analyses.D3-FMT mice showed the most significant enhancements in cholesterol ratio and decreased hepatic cholesterol levels with AC treatment.Moreover,upregulation of the Cyp7a1 gene expression was observed in this group.Furthermore,the intestinal microbiome analysis indicated higher abundances of BSH-producing Eubacterium,Bifidobacterium,and Parabacteroides in the D3-FMT+AC group compare to others,potentially contributing to increased bile acid synthesis.

基于超高效液相色谱-四极杆-静电场轨道阱高分辨质谱对天然牛黄和体外培育牛黄胆汁酸类成分的差异性分析

采用超高效液相色谱-四极杆-静电场轨道阱高分辨质谱(UHPLC-QE-Orbitrap MS)对天然牛黄和体外培育牛黄共18批样品进行分析,使用Compound Discoverer软件对胆汁酸类成分进行鉴定,结合化学统计学分析筛选不同类型牛黄的差异性成分。根据一级质谱精确质荷比和二级化合物碎片信息,鉴定了30个共有的胆汁酸类成分。聚类分析结果表明体外培育牛黄与产地呈现一致趋势,而天然牛黄的聚类趋势与产地无关。主成分分析载荷图显示胆酸、去氧胆酸等成分对主成分1的贡献较大,而甘氨鹅去氧胆酸、甘氨去氧胆酸、牛磺去氧胆酸等成分对主成分2的贡献较大。通过建立正交偏最小二乘法判别(OPLS-DA)模型,共筛选出11个胆汁酸类差异成分(VIP>1,P<0.05),其中胆酸在两组之间的含量差异最大。除了去氢胆酸和甘氨去氢胆酸,其余9个差异成分在体外培育牛黄中的相对含量均较高。研究结果可为天然牛黄和体外培育牛黄的物质基础、质量控制和资源开发应用提供理论参考。

酸汤中产酸酵母的筛选及性能测定

产酸酵母作为酸汤发酵过程中的优势菌株,是影响酸汤产品品质的关键因素。本文通过形态学、生理生化和分子生物学,对从酸汤样品中分离出的产酸菌株进行鉴定,并测定分析其产酸、耐酸和耐胆盐能力。结果表明,RS^(-1)4为盔状毕赤酵母(Pichia galeiformis),CS^(-1)6和CS^(-1)9为膜醭毕赤酵母(Pichia membranaefaciens),45、RS^(-1)3、RS^(-1)5、CS-21和CS-22为满洲毕赤酵母(Pichia manshurica)。其中,菌株45的产酸能力最强,总酸含量达到41.47 g·L^(-1),且8株酵母菌均能在pH值为1.5和牛胆盐浓度为0.70%的条件下生长,具有较高的耐酸性能和耐牛胆盐性能。本研究通过对酸汤中产酸酵母的筛选及其性能测定,为开发酸汤纯种发酵菌株和提升酸汤发酵产品品质提供理论支撑。

接线端子组件性能研究及失效分析

铝铜用接线端子是一种实现电气连接的元件,在线束组件中有着广泛的应用。由于其在使用中会长期经历严酷的环境应力和电应力,因而对其可靠性的要求较高。模拟铝铜用接线端子实际组装状态,对装配铝线和铜线的接线端子组件开展了密封防水性试验、短时耐受流试验和酸性盐雾试验等试验,对密封防水试验的典型失效样品进行了分析,找到了产品失效的原因,并为铝铜用接线端子的应用提出了建议。

Physiological and molecular biochemical mechanisms of bile formation

This review considers the physiological and molecular biochemical mechanisms of bile formation.The composition of bile and structure of a bile canaliculus,biosynthesis and conjugation of bile acids,bile phospholipids,formation of bile micellar structures,and enterohepatic circulation of bile acids are described.In general,the review focuses on the molecular physiology of the transporting systems of the hepatocyte sinusoidal and apical membranes.Knowledge of physiological and biochemical basis of bile formation has implications for understanding the mechanisms of development of pathological processes,associated with diseases of the liver and biliary tract.

陆地棉膜结合脂肪酸去饱和酶基因家族的全基因组鉴定及表达分析

膜结合脂肪酸去饱和酶(fatty acid desaturase,FAD)是生物合成不饱和脂肪酸的关键酶。本研究以陆地棉基因组数据为基础,利用生物信息学方法对棉花FAD基因家族进行全基因组鉴定和进化分析。结果表明,陆地棉基因组中共含有37个FAD基因,进化分析发现这些基因分为4个亚家族,各亚家族成员数量不一,但相同亚家族成员含有相似的基因结构和保守基序。共线性分析发现28对复制基因全为片段复制基因,且都经历了严格的纯化选择作用。此外,在陆地棉FAD基因的启动子区域,发现了丰富的响应植物激素信号和逆境胁迫的顺式作用元件。转录组分析表明,陆地棉FAD基因家族响应干旱和盐胁迫,定量PCR分析表明施加外源褪黑素显著影响了FAD基因的表达。本研究结果为进一步解析FAD家族基因的功能奠定了基础。

黏豆包发酵液中乳酸菌分离鉴定及其益生性能

从农家自然发酵黏豆包谷物发酵液中分离乳酸菌,对菌株进行鉴定,并对益生性能进行研究。利用梯度稀释法从黏豆包中筛选获得6株乳酸菌,经形态学分析并结合16S rRNA序列分析分别为棒状乳杆菌(Lactobacillus coryniformis)、植物乳杆菌(Lactobacillus plantarum)、短杆菌(Levilactobacillus brevis)、发酵乳杆菌(Lactobacillus fermentans)、清酒乳杆菌(Latilactobacillus sakei)和曲氏乳杆菌(Lactobacillus curvatus)。对菌株的益生性能评价结果表明:菌株HSDF3(曲氏乳杆菌)的抗逆性和耐酸性能较好,pH3.0的环境中存活率为100%;耐盐测试中,菌株HSDF9(清酒乳杆菌)的耐盐效果最好,在盐含量10%的MRS肉汤中仍可存活,活菌数可达8.93×106 CFU/mL;耐胆盐测试中,菌株HSDF12(棒状乳杆菌)存活率最高,在0.3%胆盐浓度的MRS肉汤培养基中培养3 h之后的存活率为7.171%;耐人工胃液测试中,经过3 h的模拟胃液培养之后,菌株HSDF3(曲氏乳杆菌)的存活率最高,达到82.91%;耐人工肠液测试中,经过6 h的模拟肠液培养之后,HSDF12(棒状乳杆菌)存活率最高,达到93.42%;抗生素敏感性试验中,菌株HSDF15(短杆菌)对四环素、羧苄西林、头孢氨苄、米诺环素、头孢唑啉、氨苄西林、头孢拉定等抗生素均敏感。

华南虎源乳酸菌的分离筛选及体外益生特性

乳酸菌对动物肠道健康具有非常重要的作用。为了筛选出具有益生特性的优良菌株,对健康华南虎(Panthera tigris amoyensis)粪便中的乳酸菌进行分离培养、纯化及鉴定,并通过研究菌株对大肠埃希氏杆菌(Escherichia coli)、金黄色葡萄球菌(Staphylococcus aureus)、沙门氏菌(Salmonella sp.)和迟钝爱德华氏菌(Edwardsiella tarda)的抑菌性及菌株的耐酸、耐胆盐、溶血性和对24种药敏纸片的耐药性,对菌株生物学特性进行评价。结果显示:共分离得到78株乳酸菌,其中15株具有较好的抑菌性能,对以上4种致病菌的抑菌圈均大于15 mm,含6株罗伊氏乳杆菌(Lactobacillus reuteri,22YY08、22DC20、22XX19、22Hui09、22LL14和22XX03)、3株卷曲乳杆菌(L. crispatus,22HH02、22YY13和22YY09)、2株动物乳杆菌(Ligilactobacillus animalis,22Hui15、22LL07)、1株戊糖片球菌(Pediococcus pentosaceus,22DC18)、1株黏膜乳杆菌(Lactobacillus mucosae,22DC10)、1株约氏乳杆菌(L. johnsonii,22DC09)和1株格氏乳球菌(Lactococcus garvieae,GaL110)。通过进一步试验筛选出8株乳酸菌,在pH=2.5和胆盐浓度为0.1%时表现出较好的耐酸、耐胆盐性能,均不产生溶血性,但其中3株罗伊氏乳杆菌22Hui09、22YY08和22LL14对多种药物耐药,其他菌株对多种药物敏感。本试验筛选获得的3株罗伊氏乳杆菌(22DC20、22XX03和22XX19)、1株戊糖片球菌(22DC18)和1株格氏乳球菌(GaL110)有希望作为具有益生特性的菌株应用到华南虎益生菌制剂的开发。