کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9616797 | 48895 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Efficient immobilization of epoxide hydrolase onto silica gel and use in the enantioselective hydrolysis of racemic para-nitrostyrene oxide
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Efficient immobilization of epoxide hydrolase onto silica gel and use in the enantioselective hydrolysis of racemic para-nitrostyrene oxide Efficient immobilization of epoxide hydrolase onto silica gel and use in the enantioselective hydrolysis of racemic para-nitrostyrene oxide](/preview/png/9616797.png)
چکیده انگلیسی
Epoxide hydrolase from Aspergillus niger (E.C. 3.3.2.3) was immobilized by covalent linking to epoxide-activated silica gel under mild conditions. A very easy procedure allowed to prepare an immobilized biocatalyst with more than 90% retention of the initial enzymatic activity. Immobilized and free enzyme showed very similar behaviour with respect to the effect of pH on activity and stability. One benefit of immobilizing epoxide hydrolase from A. niger on silica gel was the enhanced enzyme stability in the presence of 20% DMSO. The kinetic resolution of racemic para-nitrostyrene oxide was investigated by using this new immobilized biocatalyst. The enantioselectivity of the enzyme was not altered by the immobilization reaction: both unreacted epoxide and formed diol were obtained with very high ee (99 and 92%, respectively). In addition, the biocatalyst could be easily separated from the reaction mixture and re-used for over nine cycles without any noticeable loss of enzymatic activity or change in the enantioselectivity extent. The activity of immobilized AnEH was retained for several months.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis B: Enzymatic - Volume 32, Issues 5â6, 1 March 2005, Pages 219-224
Journal: Journal of Molecular Catalysis B: Enzymatic - Volume 32, Issues 5â6, 1 March 2005, Pages 219-224
نویسندگان
Antonella Petri, Patrizia Marconcini, Piero Salvadori,