Wang Xiuyun

Associate Professor   Supervisor of Master's Candidates

Gender:Female

Alma Mater:琦玉工业大学

Degree:Doctoral Degree

School/Department:化学学院

Discipline:Analytical Chemistry. Chemical Biology

Business Address:化学楼432

Contact Information:xiuyun@dlut.edu.cn

E-Mail:xiuyun@dlut.edu.cn


Paper Publications

Gold nanoparticles dissolution based colorimetric method for highly sensitive detection of organophosphate pesticides

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Indexed by:期刊论文

First Author:Wu, Shuo

Correspondence Author:Wu, S (reprint author), Dalian Univ Technol, Sch Chem, Dalian 116023, Peoples R China.

Co-author:Li, Dandan,Wang, Jiamian,Zhao, Yanqiu,Dong, Shujie,Wang, Xiuyun

Date of Publication:2017-02-01

Journal:SENSORS AND ACTUATORS B-CHEMICAL

Included Journals:SCIE、EI

Volume:238

Page Number:427-433

ISSN No.:0925-4005

Key Words:Dissolution of gold nanoparticles; Colorimetric analysis; Organophosphrous pesticide; Point-of-care; Paper device

Abstract:A simple and sensitive colorimetric method is developed for organophosphrous pesticides (OPs) analysis based on the enzymatic hydrolysis reaction of acetylcholinesterase and the dissolution of gold nanoparticles (AuNPs) in Au3+-cetyltrimethylammonium bromide (Au3+-CTAB) solution. In the absence of OPs, the enzymatic hydrolysis product, thiocholine, would reduce Au3+ and protect the AuNPs from dissolution by the Au3+-CTAB. In the presence of OPs, however, the activity of AChE is inhibited, which could not or could only produce a small amount of thiocholine to consume the Au3+. In this case, the large amount of residual Au3+ dissolves the AuNPs and decreases both the concentration and size of the AuNPs, thus leading to an obvious red-to-light pink or red-to-colorless color change. Under optimal conditions, the colorimetric method could indicate the presence of OPs, with the concentration down to 0.7 ppb. After loading AuNPs on a cellulose paper, an AuNPs-coated dipstick is developed for the detection of OPs, which is highly sensitive with an observable limit of detection of 35 ppb. Practical sample analyses in tap water, apple washing solution, and sea water indicate the colorimetric method has acceptable accuracy and good stability, even in the system containing 5 M of NaCl. Regarding these merits, the as-proposed method could be applied for the point-of-care analysis of OPs in complex systems. (C) 2016 Elsevier B.V. All rights reserved.

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在日本埼玉工业大学获得博士学位,在日本东京工业大学从事产学官连携研究员(博士后)研究2年,现就职于大连理工大学 化学学院 硕士生指导教师,副教授。