Sensitive detection of endocrine disrupters using ionic liquid--single walled carbon nanotubes modified screen-printed based biosensors.
Talanta
; 85(4): 2007-13, 2011 Sep 30.
Article
en En
| MEDLINE
| ID: mdl-21872052
ABSTRACT
Simple and low cost biosensor based on screen-printed electrode for sensitive detection of some alkylphenols was developed, by entrapment of HRP in a nanocomposite gel based on single-walled carbon nanotubes (SWCNTs) and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF(6)]) ionic liquid. Raman and FTIR spectroscopy, CV and EIS studies demonstrate the interaction between SWCNTs and ionic liquid. The nanocomposite gel, SWCNT-[BMIM][PF(6)] provides to the modified sensor a considerable enhanced electrocatalytic activity toward hydrogen peroxide reduction. The HRP based biosensor exhibits high sensitivity and good stability, allowing a detection of the alkylphenols at an applied potential of -0.2V vs. Ag/AgCl, in linear range from 5.5 to 97.7 µM for 4-t-octylphenol and respectively, between 5.5 and 140 µM for 4-n-nonylphenol, with a response time of about 5s. The detection limit was 1.1 µM for 4-t-octylphenol, and respectively 0.4 µM for 4-n-nonylphenol (S/N=3).
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Impresión
/
Técnicas Biosensibles
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Nanotubos de Carbono
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Disruptores Endocrinos
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Líquidos Iónicos
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Talanta
Año:
2011
Tipo del documento:
Article
País de afiliación:
Rumanía