Medium Optimization for Antifungal Active Substance Production from Streptomyces Lydicus Using Response Surface Methodology

Abstract

Response surface methodology was used to optimize the medium for antifungal active substance production from Streptomyces lydicus E12 in flask cultivation. Initially, the component factors, which influence antifungal substance production, were studied by varying one factor at a time. Starch, soybean cake powder, K₂HPO₄·3H₂O and MgSO₄·7H₂O were found to have a significant effect on the production of antifungal substances by the traditional design. Then, a Box–Behnken design was applied for further optimization. A quadratic model was found to fit antifungal active substance production. The analysis revealed that the optimum values of the tested variable were starch 84.96 g/L, soybean cake powder 4.13 g/L, glucose 5 g/L, MgSO₄·7H₂O 1.23 g/L, K₂HPO₄·3H₂O 2.14 g/L and NaCl 0.5 g/L. The test result of 67.44% antifungal inhibition agreed with the prediction and increased by 14.28% in comparison with the basal medium.

Keywords

Antifungal substances / Inhibition / Medium optimization / Response surface methodology / Streptomyces lydicus

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