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首页> 外文期刊>Bioprocess and Biosystems Engineering >The effect of hydrodynamic stress on the growth of Xanthomonas campestris cultures in a stirred and sparged tank bioreactor
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The effect of hydrodynamic stress on the growth of Xanthomonas campestris cultures in a stirred and sparged tank bioreactor

机译：在搅拌和鼓泡的罐式生物反应器中水动力应力对油菜黄单胞菌培养物生长的影响

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摘要

The specific growth and the xanthan production rates by the bacterium Xanthomonas campestris under different shear levels in shake flasks and in a stirred and sparged tank bioreactor have been studied. The shake flask has been used as a reference for studying the shear effects. An effectiveness factor expressed by the ratio of the observed growth rate and the growth rate without oxygen limitation or cell damage was calculated in both modes of cultures. It was observed that the effectiveness factor was strongly dependent on the operational conditions. A strong oxygen transfer limitation at low stirring rates, indicated by a 54 % decrease in the effectiveness factor was observed. In contrast, at higher stirrer speed, cell damage was caused by hydrodynamic stress in the turbulent bulk of the broth, yielding again a decrease in the effectiveness factor values for stirrer speeds higher than 500 rpm. Cell morphological changes were also observed depending on the agitation conditions, differences in morphology being evident at high shear stress.
机译：已经研究了摇瓶中以及在搅拌和鼓入的罐式生物反应器中不同剪切水平下细菌黄单胞菌的生长和黄原酸的产生速率。摇瓶已被用作研究剪切效应的参考。在两种培养方式中，计算由观察到的生长速率与没有氧气限制或细胞损伤的生长速率之比表示的有效性因子。据观察，有效性因素在很大程度上取决于运行条件。在低搅拌速率下观察到了强的氧转移极限，这表明有效因子降低了54％。相反，在较高的搅拌器速度下，细胞的破坏是由肉汤湍流中的流体动力应力引起的，对于高于500 rpm的搅拌器速度，有效系数值再次降低。还根据搅拌条件观察到细胞形态变化，在高剪切应力下，形态差异明显。

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