Screening and Identification of Cholesterol-lowering Lactic Acid Bacteria and Evaluation of Their Probiotic Characteristics
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    Abstract:

    Objective: The aim of the study was to screen lactic acid bacteria(LAB) with high cholesterol-lowering ability and great probiotic properties, from fermented food and infant feces. Methods: 102 LAB strains were collected from 20 infant feces, 8 traditional fermented pickles and 4 Jinhua ham samples. The cholesterol-lowering ability of strain ZY08 and I631, tested by gas chromatography method, was significantly higher than that of standard strain (ATCC 43121) (P<0.05), and were identified by 16S rDNA sequencing. The acid tolerance, bile salt tolerance, antibiotic sensitivity and antimicrobial activity of the two strains were evaluated. Results: Two probiotic strains with high cholesterol-lowering ability were screened: Lactobacillus plantarum ZY08 and Lactobacillus fermentans I631, and the cholesterol reduction rates were 67.45% and 63.19%, respectively. After incubation at pH 1.5 and 3.0 for 6 h, the viable bacteria numbers of strains ZY08 and I631 were greater than 6 lg (CFU/mL); the two strains had a certain tolerance to 3, 5 and 10 g/L bile salt and the tolerance to bile salt was over 80% (3 g/L bile salt); they were sensitive to the 8 kinds of antibiotics (penicillin, ampicillin, cefazolin, amikacin, gentamicin, erythromycin, sulfamethoxazole, chloramphenicol), and had no potential threat to human health. The fermentation supernatant of these two strains had a certain inhibitory effect on four intestinal pathogenic bacteria (Staphylococcus aureus, Listeria monocytogenes, Escherichia coli O157∶H7, Salmonella typhimurium). Conclusion: Lactobacillus plantarum ZY08 and Lactobacillus fermentans I631 with probiotic potential were obtained in this experiment, which could provide a source of strains for development and research of functional dairy products.

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  • Online: January 12,2021
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