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The aim of this study was to investigate the optimal conditions for increasing the growth yield of Bacillus subtilis SRCM102046, a strain possessing potential biopreservative properties. B. subtilis SRCM102046 showed remarkable antibacterial activity against a wide range of bacterial foodborne pathogens that cause serious food spoilage, as well as high antioxidant capacity. Response-surface methodology (RSM) was used to optimize medium composition to enhance B. subtilis SRCM102046 biomass. The effects of 14 different components on biomass production were investigated and three significant positive factors, molasses, sucrose, and peptone, were selected as the main factors for improving biomass based on a Plackett-Burman design (PBD). Next, we optimized the concentrations of these three factors using a central composite design. The predicted optimized concentrations were 7 g/L molasses, 7 g/L sucrose, and 2 g/L peptone. The coefficient of determination (R, 0.9755) for the model and probability value showed that our model was highly significant. Finally, an overall approximate 9-fold increase in dry cell weight yield (22.03 g/L) was achieved using the optimized medium compared with the non-optimized medium (2.47 g/L). Furthermore, we confirmed that the antibacterial activity and antioxidant activity also increased by 140% and 100.41%, respectively. These research is expected to be useful data for the production of food preservatives by establishing optimal conditions for increasing the growth yield of microorganisms possessing excellent antimicrobial activity.

Medium optimization for enhanced growth of Bacillus subtilis SRCM102046 possessing antibacterial activity using response-surface methodology