文献类型：期刊文献

英文题名：Colorimetric assay for sulfate using positively-charged gold nanoparticles and its application for real-time monitoring of redox process

作者：Zhang, Min[1];Liu, Yu-Qiang[1];Ye, Bang-Ce[1]

机构：[1]E China Univ Sci & Technol, Lab Biosyst & Microanal, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：136

期号：21

起止页码：4558

外文期刊名：ANALYST

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000295727900027)】；

基金：This work was financially supported by NSF21075040, the Shanghai 11XD1401900, 09JC1404100 and the Fundamental Research Funds for the Central Universities.

语种：英文

摘要：A flexible nanoparticle-based sulfate assay is demonstrated in which the positively-charged gold nanoparticles (cysteamine-AuNPs) act as indicator. The aggregation of cysteamine-AuNPs is selectively induced by sulfate, which allows the rapid colorimetric sensing of sulfate without any precipitant, sample preparation and specific instruments. In this work, the cysteamine-AuNPs probe has been successfully applied to the colorimetric detection of sulfate and demonstrates superior sensitivity with a detection limit of sulfate of similar to 50 ppb. A surprise finding is that the proposed probe can achieve the goal of real-time monitoring and translating a redox process into an appreciable color change via the aggregation of nanoparticles. This is a novel application of a positively-charged AuNPs-based nanoprobe for sulfate detection, kinetic study of the redox process, and opens up new opportunities for design of more novel colorimetric strategies and expansion of AuNPs-based application in different fields.