3株益生菌体外降胆固醇能力及体内降血脂效果评价

为探讨动物双歧杆菌LPL-RH、长双歧杆菌TTF及植物乳杆菌LPL-1作为降血脂益生菌的潜力,测定3株益生菌的体外胆固醇脱除率和胆盐水解酶活力,同时以益生菌灌胃高脂饮食大鼠6周后测定大鼠血脂含量变化。研究结果表明:菌株LPL-RH、TTF、LPL-1的体外胆固醇脱除率分别为23.8%、24.5%、20.9%,无显著差异(P0.05);且3株菌均有胆盐水解酶活性。菌株LPL-RH、TTF、LPL-1干预分别使高脂大鼠血清胆固醇含量分别降低17.3%、11.4%、10.1%;血清甘油三酯含量降低19.1%、16.8%、11.5%;血清低密度脂蛋白胆固醇含量降低24.0%、20.0%、10.0%;血清高密度脂蛋白胆固醇含量升高10.3%、5.2%和1.7%。综合而言,3株益生菌在体内对高脂饮食大鼠血脂有调节作用,均有开发为降血脂益生菌的潜力,其中动物双歧杆菌LPL-RH的体内降脂能力最为突出。

Cholesterol-Lowering Ability in Vitro and Hypolipidemic Effect in Vivo of Three Probiotic Strains

This study aimed to investigate the hypolipidemic potential of Bifidobacterium animalis LPL-RH, B. longum TTF and Lactobacillus plantarum LPL-1. The cholesterol-lowering ability and bile salt hydrolase activity were determined. Then, the effect of probiotic intervention on blood lipids in high-fat diet fed SD rats was examined. The results showed that the cholesterol removal rates of B. animalis LPL-RH, B. longum TTF and L. plantarum LPL-1 were 23.8%, 24.5% and 20.9%, respectively, with no significant differences among them. All three probiotics had bile salt hydrolase activity. The assays in vivo showed that intervention with LPL-RH, TTF and LPL-1 decreased serum cholesterol by 17.3%, 11.4% and 10.1%, triglycerides by 19.1%, 16.8% and 11.5%, and low-density lipoprotein cholesterol by 24.0%, 20.0% and 10.0%, and increased high-density lipoprotein cholesterol by 10.3%, 5.2% and 1.7% in hyperlipidemia rats, respectively. In summary, the three strains have the potential to be developed as lipid-lowering probiotics, with B. animalis LPL-RH having the best lipid-lowering ability.