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A new strategy to enhance polysialic acid production by controlling sorbitol concentration in cultivation of Escherichia coli K235

机译:通过控制山梨醇在大肠杆菌K235中的培养来提高多唾液酸产量的新策略

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Polysialic acid (PSA) is a new pharmaceutical material used in control release of protein drugs and as scaffold material in biomedical applications. It is also a vital source of sialic acid and its derivatives. In this paper,?we demonstrated that the substrate sorbitol has significant effect on bacterial growth and PSA formation in cultivation of?Escherichia coli?K235. Lower sorbitol concentration favored bacterial growth but retards PSA formation in the fed-batch fermentation. Higher sorbitol concentration stimulated PSA formation but inhibited bacterial growth in the batch fermentation. Sorbitol concentration gradient experiment revealed that PSA formation was seriously limited as sorbitol concentration was lower than?20 g/L, while bacterial growth was obviously inhibited as the sorbitol concentration higher than 40 g/L. A new strategy of controling sorbitol concentration in a range of 20 - 40 g/L in the broth during the fermentation process increased PSA yield by 20%.
机译:聚唾液酸(PSA)是一种新的药物材料,用于控制蛋白质药物的释放,并在生物医学应用中用作支架材料。它也是唾液酸及其衍生物的重要来源。在本文中,我们证明了底物山梨醇对培养大肠杆菌K235时细菌生长和PSA形成具有显着影响。较低的山梨醇浓度有利于细菌生长,但在分批补料发酵中会延迟PSA的形成。在分批发酵中,较高的山梨糖醇浓度可刺激PSA的形成,但会抑制细菌的生长。山梨糖醇浓度梯度实验表明,当山梨糖醇浓度低于20 g / L时,PSA的形成受到严重限制;而当山梨糖醇浓度高于40 g / L时,细菌的生长受到明显抑制。在发酵过程中,将肉汤中山梨醇浓度控制在20-40 g / L范围内的新策略可将PSA产量提高20%。

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