Using ionic liquids in whole-cell biocatalysis for the nucleoside acylation

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• 作者：Meiyan Yang ; Hui Wu ; Yan Lian ; Xiaofeng Li ; Yao Ren ; Furao Lai…
• 关键词：Biocatalysis ; Whole ; cells ; Ionic liquid ; Nucleoside ester ; Regioselectivity
• 刊名：Microbial Cell Factories
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：13
• 期：1
• 全文大小：1,621 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology
  Applied Microbiology
  Environmental Engineering/Biotechnology
  
• 出版者：BioMed Central
• ISSN：1475-2859

文摘

Background The use of biocatalysts has become an increasingly attractive alternative to traditional chemical methods, due to the high selectivity, mild reaction conditions and environmentally-friendly processes in nonaqueous catalysis of nucleosids. However, the extensive use of organic solvents may generally suffer from sever drawbacks such as volatileness and toxicity to the environment and lower activity of the biocatalyst. Recently, ionic liquids are considered promising solvents for nonaqueous biocatalysis of polyhydroxyl compounds as ILs are environmental-friendly. Results In this research, we developed new IL-containing reaction systems for synthesis of long chain nucleoside ester catalyzed by Pseudomonas fluorescens whole-cells. Various ILs exerted significant but different effects on the bio-reaction. And their effects were closely related with both the anions and cations of the ILs. Use of 10% [BMI][PF6]/THF gave high reaction efficiency of arabinocytosine laurate synthesis, in which the initial rate, product yield and 5-regioselectivity reached 2.34?mmol/L·h, 81.1% and >99%, respectively. Furthermore, SEM analysis revealed that ILs can alter the cell surface morphology, improve the permeability of cell envelopes and thus facilitate the mass transfer of substrates to the active sites of cell-bound enzymes. Conclusion Our research demonstrated the potential of ILs as promising reaction medium for achieving highly efficient and regioselective whole-cell catalysis.