標題: Semi-quantitative determination of cationic surfactants in aqueous solutions using gold nanoparticles as reporter probes
作者: Kuong, Chi-Lap
Chen, Wei-Yu
Chen, Yu-Chie
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: gold nanoparticles;cationic surfactants;iron oxide particles;chemical sensor;SALDI MS
公開日期: 1-Mar-2007
摘要: Concentrations of cationic surfactants in aqueous solutions have been estimated on the basis of changes in the color of gold nanoparticles, used as reporter probes. We have shown that the colors of gold nanoparticles with anionic protective groups on their surfaces shift from red to indigo/purple and then back to red in a range of cationic surfactant solutions in which concentrations vary from very low to above the theoretical CMCs. The color changes occur near the theoretical CMCs, presumably because the presence of surfactant micelles in the solution prevents the gold nanoparticles from aggregating. We have used gold nanoparticles as reporter probes to determine the concentrations of cationic surfactants in products such as hair conditioners, which often contain large amounts of alkyltrimethylammonium halides. Although this approach can only provide an estimate, it can be performed simply by addition of a given amount of gold nanoparticles to a series of diluted solutions, without the need for instruments or labor-intensive procedures.
URI: http://dx.doi.org/10.1007/s00216-006-1046-5
http://hdl.handle.net/11536/5112
ISSN: 1618-2642
DOI: 10.1007/s00216-006-1046-5
期刊: ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume: 387
Issue: 6
起始頁: 2091
結束頁: 2099
Appears in Collections:Conferences Paper


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