Statistical optimization of acetoin production using corn steep liquor as a low-cost nitrogen source by bacillus subtilis CICC 10025

Abstract

This chapter investigates the effect of some selected nitrogen sources (corn steep liquor— CSL, yeast extract, and beef extract) on the bioproduction of a selected flavor—acetoin (AC) from glucose—with a view to optimize its production. The results revealed that by using a cheap nitrogen source, corn steep liquor, the yield of acetoin is similar to those of the extracts of yeast and beef. Furthermore, it was shown that by using the Box-Behnken design, the optimum parameters such as glucose concentration, corn steep liquor, and inoculum size to maximize the concentration of acetoin produced are 78.40 g/L, 15% w/v, and 2.70% v/v, respectively. The validated concentration of acetoin produced in a triplicate analysis, 10.70 g/L, was 0.06% less than the predicted value. The results of this study may encourage the development of cost-effective nutritional use of corn steep liquor for bioproduction of acetoin on an industrial scale.