期刊
PLOS ONE
卷 4, 期 2, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0004359
关键词
-
资金
- National Basic Research Program of China [2007CB707803]
- Chinese National Program for High Technology Research and Development [2006AA020102, 2007AA10Z360]
Background: The demand for lactic acid has been increasing considerably because of its use as a monomer for the synthesis of polylactic acid (PLA), which is a promising and environment-friendly alternative to plastics derived from petrochemicals. Optically pure L-lactic acid is essential for polymerization of PLA. The high fermentation cost of L-lactic acid is another limitation for PLA polymers to compete with conventional plastics. Methodology/Principal Findings: A Bacillus sp. strain 2-6 for production of L-lactic acid was isolated at 55 degrees C from soil samples. Its thermophilic characteristic made it a good lactic acid producer because optically pure L-lactic acid could be produced by this strain under open condition without sterilization. In 5-liter batch fermentation of Bacillus sp. 2-6, 118.0 g/liter of L-lactic acid with an optical purity of 99.4% was obtained from 121.3 g/liter of glucose. The yield was 97.3% and the average productivity was 4.37 g/liter/ h. The maximum L-lactic acid concentration of 182.0 g/liter was obtained from 30-liter fed-batch fermentation with an average productivity of 3.03 g/liter/ h and product optical purity of 99.4%. Conclusions/Significance: With the newly isolated Bacillus sp. strain 2-6, high concentration of optically pure L-lactic acid could be produced efficiently in open fermentation without sterilization, which would lead to a new cost-effective method for polymer-grade L-lactic acid production from renewable resources.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据