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首页> 外文期刊>Bioprocess and Biosystems Engineering >Batch xylitol production by candida guilliermondii FTI 20037 from sugarcane bagasse hemicellulosic hydrolyzate at controlled pH values
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Batch xylitol production by candida guilliermondii FTI 20037 from sugarcane bagasse hemicellulosic hydrolyzate at controlled pH values

机译:在控制的pH值下,甘蔗假丝酵母半纤维素水解产物由念珠菌FTI 20037批量生产木糖醇

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摘要

Batch fermentation of sugarcane bagasse hemicellulosic hydrolyzate by the yeast Candida guilliermondii FTI 20037 was performed using controlled pH values (3.5, 5.5, 7.5). The maximum values of xylitol volumetric productivity (Q p=0.76 g/l h) and xylose volumetric consumption (Q_s=1.19 g/l h) were attained at pH 5.5. At pH 3.5 and 7.5 the Q_p value decreased by 66 and 72%, respectively. Independently of the pH value, Y_(x/s) decreased with the increase in Y_(p/s) suggesting that the xylitol bioconversion improves when the cellular growth is limited. At the highest pH value (7.5), the maximum specific xylitol production value was the lowest (q_(pmax)=0.085 g/l h.), indicating that the xylose metabolism of the yeast was diverted from xylitol formation to cell growth.
机译:使用受控的pH值(3.5、5.5、7.5),通过古德酵母念珠菌FTI 20037对甘蔗渣半纤维素水解物进行分批发酵。在pH 5.5下达到木糖醇体积生产率(Q p = 0.76g / l h)和木糖体积消耗(Q_s = 1.19g / l h)的最大值。在pH 3.5和7.5下,Q_p值分别降低了66%和72%。 Y_(x / s)与pH值无关,随Y_(p / s)的增加而降低,这表明当细胞生长受到限制时,木糖醇的生物转化率会提高。在最高pH值(7.5)下,最大的木糖醇比生产值最低(q_(pmax)= 0.085 g / l h。),表明酵母的木糖代谢从木糖醇形成转移到细胞生长。

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