Document Detail


Chemically surface-modified carbon nanoparticle carrier for phenolic pollutants: Extraction and electrochemical determination of benzophenone-3 and triclosan.
MedLine Citation:
PMID:  18471480     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chemically surface-modified (tosyl-functionalized) carbon nanoparticles (Emperor 2000 from Cabot Corp.) are employed for the extraction and electrochemical determination of phenolic impurities such as benzophenone-3 (2-hydroxy-4-methoxybenzophenone) or triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol). The hydrophilic carbon nanoparticles are readily suspended and separated by centrifugation prior to deposition onto suitable electrode surfaces and voltammetric analysis. Voltammetric peaks provide concentration information over a 10-100microM range and an estimated limit of detection of ca. 10microM (or 2.3ppm) for benzophenone-3 and ca. 20microM (or 5.8ppm) for triclosan. Alternatively, analyte-free carbon nanoparticles immobilized at a graphite or glassy carbon electrode surface and directly immersed in analyte solution bind benzophenone-3 and triclosan (both with an estimated Langmuirian binding constants of K approximately 6000mol(-1)dm(3) at pH 9.5) and they also give characteristic voltammetric responses (anodic for triclosan and cathodic for benzophenone-3) with a linear range of ca. 1-120microM. The estimated limit of detection is improved to ca.5microM (or 1.2ppm) for benzophenone-3 and ca. 10microM (or 2.3ppm) for triclosan. Surface functionalization is discussed as the key to further improvements in extraction and detection efficiency.
Authors:
Lorena Vidal; Alberto Chisvert; Antonio Canals; Elefteria Psillakis; Alexei Lapkin; Fernando Acosta; Karen J Edler; James A Holdaway; Frank Marken
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-11
Journal Detail:
Title:  Analytica chimica acta     Volume:  616     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-05-12     Completed Date:  2008-07-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  28-35     Citation Subset:  IM    
Affiliation:
Departamento de Química Analítica, Nutrición y Bromatología, Universidad de Alicante, P.O. Box 99, E-03080, Alicante, Spain.
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MeSH Terms
Descriptor/Qualifier:
Benzophenones / analysis*
Carbon / chemistry*
Electrochemistry
Electrodes
Nanoparticles / chemistry*
Particle Size
Sensitivity and Specificity
Surface Properties
Triclosan / analysis*
Water Pollutants / analysis*
Chemical
Reg. No./Substance:
0/Benzophenones; 0/Water Pollutants; 131-57-7/oxybenzone; 3380-34-5/Triclosan; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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