通过无氧呼吸培养高细胞密度培养
Marte Mølsæter Maråk1, Ricarda Kellermann1, Linda Liberg Bergaust2
1Faculty of Biotechnology, Chemistry and Food Science, Norwegian University for Life Sciences, Ås, Norway.
Microbial cell factories
|November 26, 2024
概括
这项研究展示了一种新的pH-stat方法,用于使用脱化进行高细胞密度培养,达到20g/L的Paracoccus denitrificans. 二氧化碳的积累被认为是优化这种无氧细菌生长方法的关键挑战.
科学领域:
- 生物技术是生物技术.
- 微生物培养 微生物培养
- 无氧呼吸是一种无氧呼吸.
背景情况:
- 氧气限制阻碍了传统的有氧高细胞密度培养 (HCDC).
- 脱化提供了一个使用酸盐 (NO3-) 作为电子受体的替代方案.
- 使用酸 (HNO3) 的新型pH-stat方法可以避免在脱过程中盐的积累.
研究的目的:
- 评估一种新的pH-stat脱法对细菌HCDC的可行性.
- 以无氧方式培养模型菌株Paracoccus denitrificans的高密度.
- 确定挑战并优化无氧高细胞密度培养.
主要方法:
- 使用葡萄糖和酸盐进行Paracoccus denitrificans的食批量种植.
- 使用酸 (HNO3) 的pH-stat系统进行pH控制.
- 监测细胞干重量,微量元素吸收和中间代谢物积累.
主要成果:
- 与低密度培养物相比,实现了20g细胞干重L-1,增长速度较慢.
- 确定二氧化碳 (CO2) /碳酸 (H) 积累是抑制pH和有限HNO养的主要原因.
- 证明不平衡的电子流可以导致有毒中间体的积累,而营养物质的限制会导致聚酸酸盐的积累.
结论:
- 这项研究通过pH-stat脱化提供了无氧HCDC的概念证明.
- 二氧化碳的积累是优化方法的一个重大障碍.
- 精心平衡葡萄糖和酸 (HNO3) 对于高效的脱化至关重要.
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