کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9743732 | 1491198 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Femtomolar immunoassay based on coupling gold nanoparticle enlargement with square wave stripping voltammetry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The enhancement in sensitivity for an electrochemical immunoassay by the autocatalytic deposition of Au3+ onto gold nanoparticles has been studied. By coupling the autocatalytic deposition with square-wave stripping voltammetry, enlarged gold nanoparticles labeled on goat anti-rabbit immunoglobulin G (GaRIgG-Au) and, thus, the rabbit immunoglobulin G (RIgG) analyte could be determined quantitatively. A variety of variables, such as concentration of AuCl4â, the reducing agent used, the duration of autocatalytic deposition, and parameters for the stripping analysis were optimized. From a calibration graph over a broad dynamic range of concentrations (1-500 pg mLâ1; R2 = 0.9975) a very low detection limit, 0.25 pg mLâ1 (1.6 fM), which is three orders of magnitude lower than that obtained by a conventional immunoassay using the same gold nanoparticle labels was obtained; this finding confirms applicability and effectiveness of our method of enhancing the sensitivity of gold nanoparticle label-based sandwich immunoassays. The reliability of this method was confirmed by the rather low values of RSD (2.82%, n = 11; 2.44%, n = 9) obtained for assays of a blank solution and for 0.02 ng mLâ1 RIgG solution, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 538, Issues 1â2, 4 May 2005, Pages 159-164
Journal: Analytica Chimica Acta - Volume 538, Issues 1â2, 4 May 2005, Pages 159-164
نویسندگان
Kuo-Tang Liao, Hsuan-Jung Huang,