Highly efficient rice straw utilization for poly-(gamma-glutamic acid) production by Bacillus subtilis NX-2

摘要

Lignocellulosic biomass has been identified as an economic and environmental feedstock for future biotechnological production. Here, for the first time, poly-(gamma-glutamic acid) (PGA) production by Bacillus subtilis NX-2 using rice straw is investigated. Based on two-stage hydrolysis and characteristic consumption of xylose and glucose by B. subtilis NX-2, a co-fermentation strategy was designed to better accumulate PGA in a 7.5 L fermentor by two feeding methods. The maximum cumulative respective PGA production and PGA productivity were 73.0 +/- 0.5 g L-1 and 0.81 g L-1 h(-1) by the continuous feeding method, with carbon source cost was saved by 84.2% and 42.5% compared with glucose and cane molasse, respectively. These results suggest that rice straw, a type of abundant, low-cost, non-food lignocellulosic feedstock, may be feasibly and efficiently utilized for industrial-scale production of PGA. (C) 2015 Elsevier Ltd. All rights reserved.