Abstract
In this study, Lacticaseibacillus casei NCIM 5752, a new isolate has been explored for probiotic properties and has shown significant bile salt hydrolase activity and cholesterol-reducing activity (56.7 ± 0.27%) in the presence of bile salts. It also tested negative for the production of lecithinase and gelatinase, indicating its non-pathogenic nature. The test strain was able to tolerate pH of 2.0 and 3.0 with 63.42 and 94.7% of the cells survived after 3 h. L. casei showed auto-aggregation of 85.3% and surface hydrophobicity of 22.5% in xylene and 19.4% in hexane. Paneer whey was explored as a basic raw material for alternative media formulation for growing lactic acid bacteria. Paneer whey was found to contain lactose (4.15%), protein (0.42%), and rich in mineral content. Response surface methodology was employed to optimize the medium composition with three independent variables yeast extract (X1), dextrose (X2), and dipotassium hydrogen phosphate (X3), and the response-Y was set to biomass obtained in terms of log CFU/ml. They were supplemented to paneer whey medium for growing this strain. The second-order polynomial regression model predicted that the maximum cell mass production of 11.30 ± 0.5 log CFU/ml at optimal composition of 16.22 g/L of yeast extract, 19.31 g/L of dextrose, and 2.12 g/L of dipotassium hydrogen phosphate in paneer whey medium. Experiments were conducted to validate the RSM results, and the biomass achieved was 11.27 ± 0.50 log CFU/ml, which is in close agreement with the yield predicted by the RSM. By applying the fermentation strategy, the biomass was increased to 5.56 ± 0.34 g/L dry cell weight corresponding to 11.58 ± 0.24 log CFU/ml. The newly optimized media was significantly cost-effective and produced 26.45% more biomass than the conventional MRS media. This optimized media may find application for the large-scale biomass production of probiotics.
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Acknowledgments
The authors gratefully thank the Director of CSIR-CFTRI, Mysore, for providing facilities to carry out this work. One of the authors, MN, gratefully acknowledges RCB-DBT, New Delhi, for the award of DBT-JRF fellowship - DBT/JRF/15/AL/232. The author also thanks Mega-dairy, Mysuru, for providing paneer whey for experiments.
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This work was supported by the RCB-DBT (DBT/JRF/15/AL/232) Faridabad, India.
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MN: Investigation, writing, editing, and reviewing, NKR: RSM experimental design and statistical analysis of the RSM data, SD: conceptualization, supervision, editing, and reviewing. All the authors read and approved the final manuscript.
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Nanjaiah, M., Rastogi, N.K. & Devappa, S. Study of the probiotic properties of Lacticaseibacillus casei subsp. casei NCIM 5752 and the optimization of whey-based media for the production of its biomass using response surface methodology. 3 Biotech 14, 49 (2024). https://doi.org/10.1007/s13205-023-03899-z
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DOI: https://doi.org/10.1007/s13205-023-03899-z