Abstract
Twenty-five strains of lactic acid bacteria (LAB) isolated from South Indian traditional fermented foods Kallappam batter, Koozh and Mor Kuzhambu. Further 6 strains were selected based on their antimicrobial activity. They were identified according to morphological, biochemical and physiological criteria. Identification by 16S rDNA sequence homology of the isolates revealed the presence of Weissella paramesenteroides, Lactobacillus plantarum and Lactobacillus fermentum. Lactobacillus plantarum AS1 showed maximum antimicrobial activity among 6 strains and this strain was chosen for biopreservation. When male Albino Wistar rats were fed with L. plantarum AS1 (approx. 109 cells/mL for a month), there was no sign of any illness and they were on par with control rats in terms of weight gain/week. In the L. plantarum AS1–treated group, there was reduction in the populations of indigenous microflora of coliforms, yeast and molds; however, the lactobacilli population increased comparatively. L. plantarum AS1 was able to retain its normal growth in the presence of increasing concentration of bile salt in the MRS and it also tolerated the artificial gastric juice simulating the condition inside the stomach where it was viable for 24 h with bacterial count of 6.079 logCFU/mL. L. plantarum AS1 reduced the cholesterol in the MRS broth by 57.3%. Hence, all these properties established it as an effective probiont. L. plantarum AS1 found to be an effective biopreservative in cheese, where it decreased the population of Salmonella typhi by 2.95 log cycles.
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This work was supported by a grant from Department of Biotechnology (DBT), India. R.S.K. was supported by an ICMR fellowship.
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Satish Kumar, R., Ragu Varman, D., Kanmani, P. et al. Isolation, Characterization and Identification of a Potential Probiont from South Indian Fermented Foods (Kallappam, Koozh and Mor Kuzhambu) and Its Use as Biopreservative. Probiotics & Antimicro. Prot. 2, 145–151 (2010). https://doi.org/10.1007/s12602-010-9052-5
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DOI: https://doi.org/10.1007/s12602-010-9052-5