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首页> 外文期刊>Bioprocess and Biosystems Engineering >Synthesis of vanillic acid using whole cell nitrilase of wild and mutant Gordonia terrae
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Synthesis of vanillic acid using whole cell nitrilase of wild and mutant Gordonia terrae

机译:野生和突变体Gordonia terrae全细胞腈水解酶合成香草酸

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摘要

The resting cells of Gordonia terrae mutant E9 having enhanced nitrilase activity were used for biotransformation of 4-hydroxy-3-methoxybenzonitrile into vanillic acid. The maximum conversion was observed in 0.1 M phosphate buffer (pH 8.0), using 60 mM substrate and 0.75 mg(DCW) resting cells in 1 mL reaction at 40 A degrees C. K (m) of the whole cell nitrilase of wild and mutant strains of G. terrae for this substrate were 20 and 16.6 mM, and V (max) were 0.19 and 0.95 , respectively. Fed batch reaction for transformation of 4-hydroxy-3-methoxybenzonitrile using whole cell nitrilase of wild G. terrae resulted in 2.36 g of vanillic acid in 5 h with a catalytic and volumetric productivity of 0.78 and 4.72 gL(-1)h(-1), respectively. The whole cell nitrilase of G. terrae mutant E9 resulted in higher catalytic and volumetric productivity, i.e., 1.68 and 10 gL(-1)h(-1). A total 5.04 g of vanillic acid with 99 % purity were accumulated in 100 mL of reaction after 5 h.
机译:具有增强的腈水解酶活性的Gordonia terrae突变体E9的静息细胞用于将4-羟基-3-甲氧基苄腈生物转化为香草酸。在40 A的野生环境和突变体全细胞腈水解酶的K(m)中,使用60 mM底物和0.75 mg(DCW)静息细胞在1 mL反应液中,在0.1 M磷酸盐缓冲液(pH 8.0)中观察到最大转化率。该底物的G.terrae菌株为20和16.6mM,V(最大)分别为0.19和0.95。美联储分批反应,使用野生G.terra的全细胞腈水解酶转化4-羟基-3-甲氧基苄腈,在5小时内产生2.36 g香草酸,催化和容积生产率分别为0.78和4.72 gL(​​-1)h(- 1)。 G.terrae突变体E9的全细胞腈水解酶导致较高的催化和体积生产率,即1.68和10 gL(-1)h(-1)。 5小时后,在100 mL反应中累积了5.04 g纯度为99%的香草酸。

著录项

  • 来源
    《Bioprocess and Biosystems Engineering》 |2016年第1期|67-73|共7页
  • 作者单位

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

    Himachal Pradesh Univ, Dept Biotechnol, Summer Hill Shimla 171005, Himachal Prades, India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nitrilase; Mutant; 4-hydroxy-3-methoxybenzonitrile; Vanillic acid;

    机译:腈水解酶;突变剂;4-羟基-3-甲氧基苄腈;香草酸;

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