Autori: Ana-Maria Gurban, Lucian Rotariu, Mihaela Baibarac, Ion Baltog, Camelia Bala
Editorial: Talanta, 85, p.2007-2013, 2011.
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 microM for 4-t octylphenol and respectively, between 5.5 and 140 microM for 4-n nonylphenol, with a response time of about 5s. 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: Single-walled carbon nanotubes, Ionic liquid, Screen-printed electrode, Alkylphenols