کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
59156 1419420 2016 12 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
A magnetic biocatalyst based on mussel-inspired polydopamine and its acylation of dihydromyricetin
ترجمه فارسی عنوان
بیوکاتالیست مغناطیسی بر اساس polydopamine الهام گرفته از صدف و آسیلاسیون آن dihydromyricetin
کلمات کلیدی
اکسید آهن مغناطیسی؛ نانوذرات؛ Polydopamine؛ قارچ Aspergillus niger لیپاز؛ Dihydromyricetin؛ آسیلاسیون
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی

A support made of mussel-inspired polydopamine-coated magnetic iron oxide nanoparticles (PD-MNPs) was prepared and characterized. The widely used Aspergillus niger lipase (ANL) was immobilized on the PD-MNPs (ANL@PD-MNPs) with a protein loading of 138 mg/g and an activity recovery of 83.6% under optimized conditions. For the immobilization, the pH and immobilization time were investigated. The pH and thermal and storage stability of the ANL@PD-MNPs significantly surpassed those of free ANL. The ANL@PD-MNPs had better solvent tolerance than free ANL. The secondary structure of free ANL and ANL@PD-MNPs was analyzed by infrared spectroscopy. A kinetic study demonstrated that the ANL@PD-MNPs had enhanced enzyme-substrate affinity and high catalytic efficiency. The ANL@PD-MNPs was applied as a biocatalyst for the regioselective acylation of dihydromyricetin (DMY) in DMSO and gave a conversion of 79.3%, which was higher than that of previous reports. The ANL@PD-MNPs retained over 55% of its initial activity after 10 cycles of reuse. The ANL@PD-MNPs were readily separated from the reaction system by a magnet. The PD-MNPs is an excellent support for ANL and the resulting ANL@PD-MNPs displayed good potential for the efficient synthesis of dihydromyricetin-3-acetate by enzymatic regioselective acylation.

Graphical AbstractThe preparation of polydopamine-coated magnetic iron oxide nanoparticles (PD-MNPs), Aspergillus niger lipase (ANL) immobilization on PD-MNPs, and the catalytic activity of ANL@PD-MNPs for dihydromyricetin (DMY) acylation were studied.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Catalysis - Volume 37, Issue 4, April 2016, Pages 584–595
نویسندگان
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