A refined medium to enhance the antimicrobial activity

Postbiotic RS5, produced by Lactiplantibacillus plantarum RS5, has been identified as a promising alternative feed supplement for various livestock. This study aimed to lower the production cost by enhancing the antimicrobial activity of the postbiotic RS5 by improving the culture density of L. plantarum RS5 and reducing the cost of growth medium. A combination of conventional and statistical-based approaches (Fractional Factorial Design and Central Composite Design of Response Surface Methodology) was employed to develop a refined medium for the enhancement of the antimicrobial activity of postbiotic RS5. A refined medium containing 20 g/L of glucose, 27.84 g/L of yeast extract, 5.75 g/L of sodium acetate, 1.12 g/L of Tween 80 and 0.05 g/L of manganese sulphate enhanced the antimicrobial activity of postbiotic RS5 by 108%. The cost of the production medium was reduced by 85% as compared to the commercially available de Man, Rogosa and Sharpe medium that is typically used for Lactobacillus cultivation.

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FIG: Effects of different yeast extract concentrations on antimicrobial activity of postbiotic RS5 and biomass produced by L. plantarum RS5. (a) Antimicrobial activity profiles of postbiotic RS5 and (b) growth profile of L. plantarum RS5 in control MRS medium (x) and growth medium containing 11.89 g/L (85.49 mM N) (filled square), 27.84 g/L (200.18 mM N) (filled circle), 36.20 g/L (260.28 mM N) (filled triangle) and 44.55 g/L of yeast extract (320.32 mM N) (filled rhombus). Values presented are mean ± SEM, n = 3. Vertical bars represent SEM.

Hence, the refined medium has made the postbiotic RS5 more feasible and cost-effective to be adopted as a feed supplement for various livestock industries.

Ooi, M.F., Foo, H.L., Loh, T.C. et al. A refined medium to enhance the antimicrobial activity of postbiotic produced by Lactiplantibacillus plantarum RS5. Sci Rep 11, 7617 (2021). https://doi.org/10.1038/s41598-021-87081-6

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