Acetic acid production by the newly isolated Pseudomonas sp. CSJ-3

A fermentative acetic acid producing strain, named CSJ-3, was isolated from sludge and identified as Pseudomonas sp. on the basis of 16S rRNA gene analysis. The effects of cultivation conditions on the production of acetic acid by Pseudomonas sp. CSJ-3 were investigated in batch fermentation, and the maximum yield of acetic acid reached up to 0.49 % during 30 h cultivation under the optimum growth condition, including fermentation temperature of 37.0 ºC, fermentation pH of 4.50, ethanol concentration of 8 %, carbon source (glucose) amount of 10 g/L, and rotation speed of 120 r/min. When ultraviolet (UV) irradiation was used for the mutation in culture medium to improve the yield of acetic acid, the results showed that the yield of acetic acid reached up to 0.59 %. UV and FTIR confirmed that acetic acid was the major fermented product.