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Purpose : To enhance butyric acid production by solid-state fermentation with a hyper-producing mutant of Clostridium tyrobutyricum generated by random mutagenesis. Methods : Wild type C. tyrobutyricum was mutagenized with UV irradiation, nitrous acid, and ethidium bromide to obtain a hyper-producing strain. Various physiochemical parameters were optimized to increase the butyric acid yield. Results : The UV-induced mutant (C.T UV ) produced significantly higher concentrations of butyric acid than the wild type parent, nitrous acid-induced, and ethidium bromide-induced strains. C.T UV increased butyric acid production 1.4-fold more than the parent strain. Fermentation with C.T UV with 2.5 g of rice polishings (w/w), a 2 % inoculum volume (v/v), and a 48-h incubation period at 37°C under anaerobic conditions produced 11.63 mg/100 g of butyric acid. The addition of 0.6 % corn steep liquor as a nitrogen source increased the butyric acid concentration to 26.09 mg/100 g. Conclusion : These optimized fermentation parameters on a small scale can be used on a commercial scale to mass-produce butyric acid. Keywords : Butyric acid, Mutant, Clostridium tyrobutyricum , Mutagen, Solid-state fermentation

Enhanced production of butyric acid by solid-state fermentation of rice polishings by a mutant strain of Clostridium tyrobutyricum