کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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745591 | 894423 | 2009 | 7 صفحه PDF | دانلود رایگان |
A well-defined amphiphilic diblock copolymer, poly [N-(2-methacryloyloxyethyl) pyrrolidone]-block-poly [glycidyl methacrylate] (PNMP-b-PGMA), was applied to immobilize hemoglobin (Hb) in a simple procedure. The characterization of PNMP-b-PGMA/Hb film was demonstrated by ultraviolet–visible (UV–vis) spectra, atomic force microscopy (AFM), and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of Hb in PNMP-b-PGMA film have been investigated and a pair of well-defined and nearly reversible cyclic voltammetric peaks for the protein heme Fe(III)/Fe(II) redox couples were observed at about −0.409 V (vs. SCE) in pH 7.0 phosphate buffer solution (PBS). The results showed that the PNMP-b-PGMA film improved the protein loading with the retention of bioactivity and greatly promoted the direct electron transfer between Hb and electrode surface. This PNMP-b-PGMA/Hb film modified electrode also exhibited high electrocatalytic effects towards reduction of nitric oxide (NO). These results indicated the potential applicability of the films as new types of third-generation biosensors or bioreactors based on direct electrochemistry of the proteins.
Journal: Sensors and Actuators B: Chemical - Volume 138, Issue 1, 24 April 2009, Pages 244–250