Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 75, Issue 1, Pages 88-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2009.08.016
Keywords
Surface enhancement effect; Mesoporous silica; Electrochemistry; Dopamine; Detection
Funding
- Foundation of Wenzhou Science & Technology Bureau [Y20060241]
- Zhejiang Province Extremely Key Subject Building Funding Pharmacology and Biochemical Pharmaceutics
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Mesoporous silica nanoparticles (meso-SiO(2)) were synthesized and used to modify the sui face of carbon paste electrode (CPE). The surface properties of CPE and meso-SiO(2)/CPE were examined Compared with the unmodified CPE, meso-SiO(2)/CPE remarkably enhances the peak currents of K(3)[Fe(CN)(6)] The effective surface areas of CPE and meso-SiO(2)/CPE were calculated to be 0.042 cm(2) and 0 208 cm(2), indicating that meso-SiO(2) possesses notable sui face enhancement effect Moreover, the electrochemical behaviors of dopamine (DA) were examined At the meso-SiO(2)/CPE, the oxidation signals of DA greatly increase, and the oxidation potential shifts negatively, suggesting that meso-SiO(2)/CPE exhibits catalytic activity to DA Based on this, a sensitive and simple electrochemical method was developed for the detection of DA The linear range is from 04 mu M to 25 mu M, and the limit of detection is as low as 0 1 mu M (C) 2009 Elsevier B V All rights reserved
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