首页> 外文期刊>Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies >Enhancing nemadectin production by Streptomyces cyaneogriseus ssp noncyanogenus through quantitative evaluation and optimization of dissolved oxygen and shear force
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Enhancing nemadectin production by Streptomyces cyaneogriseus ssp noncyanogenus through quantitative evaluation and optimization of dissolved oxygen and shear force

机译:通过定量评估和优化溶解氧和剪切力,通过定量评估和优化增强NEMADECTIN生产。

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摘要

In this study, effects of oxygen supply and shear stress on nemadectin production by Streptomyces cyaneogriseus ssp. noncyanogenus (S. cyaneogriseus) fermentation were investigated in shake flasks and 5-L bioreactors. Results showed sufficient dissolved oxygen level was essential for cells growth and nemadectin biosynthesis, while strong shear stress had negative impacts on both cell growth and nemadectin synthesis. Furthermore, when a combined paddle type was applied in culturing S. cyaneogriseus, the nemadectin production was increased by 23.6%. The influence of different agitation rates and paddle types on volumetric oxygen transfers coefficient (KLa) and shear stress were quantitatively studied through computational fluid dynamics simulation (CFD). The results of CFD revealed that high KLa as well as low shear stress co-existed under the combined impeller configuration at 650 rpm. This study is expected to be helpful to the scale-up of nemadectin fermentation and other stress-sensitive but high-oxygen-consumption filamentous microorganism.
机译:在这项研究中,氧气供应和剪切应力对细胞霉菌SSP的NemAdectin产生的影响。在摇瓶和5-L生物反应器中研究了非胞菌菌(S. cyaneogriseus)发酵。结果表明,足够的溶解氧水平对于细胞生长和NemAdectin生物合成至关重要,而强烈的剪切应力对细胞生长和NemAdectin合成具有负面影响。此外,当在培养S. mananeogriseus培养的组合桨式型时,Nemadectin产量增加了23.6%。通过计算流体动力学模拟(CFD)定量地研究了不同搅拌速率和桨叶类型对体积氧转移系数(KLA)和剪切应力的影响。 CFD的结果揭示了高KLA以及在650rpm的组合叶轮构型下共存的低剪切应力。预计该研究将有助于NemAdectin发酵和其他应激敏感但高氧消耗丝状微生物的扩大。

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