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投稿时间:2015-01-09
投稿时间:2015-01-09
中文摘要: 利用高通量生物反应器,以在线监测的 pH 为直接反馈补料信号,以葡萄糖、氨水和硫酸铵混合溶液为流加液 进行补料发酵生产 L-赖氨酸。当流加液中葡萄糖含量均为 360 g/L 时,对流加液中硫酸铵添加量、氨水添加量和发酵培 养基接种量进行了单因素优化,确定一段式流加培养最佳条件为氨水添加量 180 mL/L、硫酸铵添加量 40 g/L、接种量为 5 mL/45 mL 培养基。分段式补料培养研究结果表明,在赖氨酸发酵的不同阶段采用不同配比的流加液进行分段式培养 可以进一步提高赖氨酸的产酸浓度,同时降低残糖和残铵氮含量。三段式 pH 反馈补料发酵可以将赖氨酸产酸浓度提 高到(56.85±0.98)g/L,与二段式和一段式相比分别提高 8.65 %和 23.64 %。
中文关键词: L-赖氨酸 分段式pH反馈补料发酵 高通量生物反应器
Abstract:L-lysine fed-batch fermentations were carried out in high throughput bioreactors, and pH was used as a direct feedback signal to feed the solution mixed with glucose, ammonia water and ammonium sulfate. The single factor optimization experiments on addition amount of ammonia water, ammonium sulfate and inoculation quantity, when glucose level in feeding liquid was 360 g/L, were developed. The best composition of one section fermentation feeding liquid was ammonia water 180 mL/L, ammonium sulfate 40 g/L and inoculation quantity 5 mL/45 mL. The results of phased fed-batch showed that the yield of L-lysine was increased meanwhile the level residual sugar and ammonium was decreased, when feeding liquid with different composition was used at different fermentation stages. The production was enhanced by (56.85±0.98) g/L at the end of tri-section pH feedback fed-batch fermentation, which was increased by 8.65 % and 23.64 % respectively compared with bisection and one section styles.
文章编号:201606042 中图分类号: 文献标志码:A
基金项目:国家973计划项目子课题(2013CB733901);国家863计划项目子课题(2014AA021201);中粮集团技术开发研究项目(2013-C2-T011);中粮集团技术开发研究项目(2013-C2-T010)
作者 | 单位 |
梁恒宇1,林海龙1,孙际宾2,卢宗梅3,陈博1,孙村民2 | 1.中粮营养健康研究院,北京 100020;2.中国科学院 天津工业生物技术研究所,天津 300308;3.中粮生物化学(安徽)股份有限公司,安徽 蚌埠 233010 |
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