Journal
ANALYTICAL LETTERS
Volume 49, Issue 4, Pages 556-567Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00032719.2015.1075133
Keywords
Didodecyldi methylammonium bromide; electrochemistry; hemoglobin; platinum nanoparticles
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Funding
- National Natural Science Foundation of China [21405019]
- Natural Science Foundation of Anhui Province [1408085QB39]
- Natural Science Foundation of Colleges and Universities in Anhui Province [KJ2011A210]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates of China [AH201310371024, AH201410371001]
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The electrochemistry of didodecyldimethylammonium bromide and polyvinylpyrrolidone-protected platinum nanoparticles was characterized with immobilized hemoglobin on a glassy carbon electrode. Platinum nanoparticles with an average diameter of 3nm were prepared and showed excellent stability with polyvinylpyrrolidone. Hemoglobin/polyvinylpyrrolidone-platinum/didodecyldimethylammonium bromide films on glassy carbon allowed more rapid, direct electron transfer between the protein and electrode than on an unmodified electrode. The hemoglobin/polyvinylpyrrolidone-platinum/didodecyldimethylammonium bromide/glassy carbon electrode was reversible with better sensitivity than hemoglobin/didodecyldimethylammonium bromide or hemoglobin/polyvinylpyrrolidone-platinum film electrodes. The modified electrode offered good sensitivity for oxygen and hydrogen peroxide, as well as long-term stability, good reproducibility, and excellent selectivity. The electrode response was linear with hydrogen peroxide concentrations from 0.020 to 0.240 mu mol/L with a detection limit of 0.010 mu mol/L. The apparent Michaelis-Menten constant was 0.107mmol/L.
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