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Sensitive detection of endocrine disrupters using ionic liquid – Single walled carbon nanotubes modified screen-printed based biosensors

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Ana-Maria Gurban, Lucian Rotariu, Mihaela Baibarac, Ioan Baltog, Camelia Bala

Editorial: Talanta, 85 (4), p.2007-2013, 2011.

Rezumat:

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][PF6]) ionic liquid.
Raman and FTIR spectroscopy, CV and EIS studies demonstrate the interaction between SWCNTs and
ionic liquid. The nanocomposite gel, SWCNT–[BMIM][PF6] 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
−0.2 V vs. Ag/AgCl, in linear range from 5.5 to 97.7 M for 4-t-octylphenol and respectively, between
5.5 and 140 M for 4-n-nonylphenol, with a response time of about 5 s. The detection limit was 1.1 M
for 4-t-octylphenol, and respectively 0.4 M for 4-n-nonylphenol (S/N = 3).

Cuvinte cheie: clinical and biological chemistry, environmental analysis, geochemistry, and materials science

URL: http://www.elsevier.com/locate/talanta