期刊
BIORESOURCE TECHNOLOGY
卷 177, 期 -, 页码 141-148出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.11.078
关键词
Poly-(gamma-glutamic acid); Membrane-integrated system; Ultrafiltration; Cell recycle; Continuous system
资金
- Department of Science and Technology, Government of India [SB/FTB/ETA-59/2013]
Experimental investigations were carried out on continuous and direct production of poly-(gamma-glutamic acid) in a hybrid reactor system that integrated conventional fermentative production step with membrane-based downstream separation and purification. Novelty of the integrated system lies in high degree of purity, conversion, yield and productivity of poly-(gamma-glutamic acid) through elimination of substrate-product inhibitions of traditional batch production system. This new system is compact, flexible, eco-friendly and largely fouling-free ensuring steady and continuous production of poly-(gamma-glutamic acid) directly from a renewable carbon source at the rate of 0.91 g/L/h. Cross-flow microfiltration membrane modules ensured almost complete separation and recycle of cells without much fouling problem. Well-screened ultrafiltration membrane module helped to concentrate poly-(gamma-glutamic acid) while ensuring recovery and recycle of 96% unconverted carbon source resulting in yield of 0.6 g/g along with high product purity. (C) 2014 Elsevier Ltd. All rights reserved.
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