Control of cell growth rate by sugar feeding based on CO2 production rate

Mutsumi Takagi, Fumihiro Ishimura, Isao Fujimatsu
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引用次数: 1

Abstract

Sugar feeding based on the CO2 production rate was investigated for the control of the cell growth rate during cephalosporin C fermentation in which sugar concentration was the growth limiting factor. The rates of cell growth and sugar consumption were apparently influenced by the sugar feed rate, as the sugar concentration in the broth was kept at approximately 1 g/l during the cultivation. The ratio of the CO2 production rate to the sugar consumption rate was maintained almost constant after 40 h cultivation. Stepwise alteration in sugar feed rate after the culture time of 50 h caused a change in the CO2 production rate within 15 min. These results indicated that the CO2 production rate could be used as an effective parameter of sugar consumption and cell growth rates. Consequently, a control strategy was developed that involved the control of sugar feed rate so that a CO2 production rate profile corresponded to a preset standard profile. For the half the usual amount of inoculum, the sugar feeding control system enabled the cell concentration to increase faster to that in the usual inoculum. The cell concentration deviation during exponential growth phase among several batches, decreased to half using this sugar feeding control system compared to the culture without such control. These results indicated that the sugar feeding control system developed in this report was found to be efficient for control of cell growth.

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以CO2产率为基础,通过喂糖控制细胞生长速率
在头孢菌素C发酵过程中,以糖浓度为生长限制因子,研究了以CO2产率为基础投糖控制细胞生长速率的方法。在培养过程中,培养基中的糖浓度保持在1 g/l左右,细胞的生长速率和糖的消耗明显受到糖投喂率的影响。培养40 h后,CO2产率与糖耗率之比基本保持不变。在培养50 h后,逐渐改变投糖量,可在15 min内引起CO2产率的变化。这些结果表明CO2产率可以作为糖消耗和细胞生长速度的有效参数。因此,开发了一种控制策略,包括控制糖的进料速率,使CO2的生产速率曲线符合预设的标准曲线。在通常接种量的一半的情况下,糖的饲喂控制系统使细胞浓度比通常接种量增加得更快。与不加糖控制的培养相比,加糖控制的细胞在指数生长阶段的浓度偏差减少了一半。这些结果表明,本研究开发的糖摄食控制系统对控制细胞生长是有效的。
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