Optimization of bacterial cellulose production by Gluconacetobacter xylinus using carob and haricot bean

Bacterial cellulose (BC) can be used in medical, biomedical, electronic, food, and paper industries because of its unique properties distinguishing it from plant cellulose. BC production was statistically optimized by Gluconacetobacter xylinus strain using carob and haricot bean (CHb) medium. Eight parameters were evaluated by Plackett–Burman Design and significant three parameters were optimized by Central Composite Design. Optimal conditions for production of BC in static culture were found as: 2.5 g/L carbon source, 2.75 g/L protein source, 9.3% inoculum ratio, 1.15 g/L citric acid, 2.7 g/L Na2HPO4, 30 °C incubation temperature, 5.5 initial pH, and 9 days of incubation. This study reveals that BC production can be carried out using carob and haricot bean extracts as carbon and nitrogen sources, and CHb medium has higher buffering capacity compared to Hestrin and Schramm media. Model obtained from this study is used to predict and optimize BC production yield using CHb medium.