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Type: Artigo de periódico
Title: Ultrasensitive Biosensor For Detection Of Organophosphorus Pesticides Based On A Macrocycle Complex/carbon Nanotubes Composite And 1-methyl-3-octylimidazolium Tetrafluoroborate As Binder Compound
Author: Pereira N.D.M.
De Oliveira F.M.
Pereira N.R.
Verly R.M.
Souto D.E.P.
Kubota L.T.
Tanaka A.A.
Damos F.S.
Luz R.C.S.
Abstract: This work describes the highly sensitive detection of organophosphorus pesticides employing the cobalt(II) 4,4,4,4-tetrasulfo-phthalocyanine (CoTSPc) macrocycle complex, carbon nanotubes (CNT), and 1-methyl-3-octylimidazolium tetrafluoroborate (OMIM[BF4]). The technique is based on enzyme acetylcholinesterase (AChE) inhibition. The composite was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and amperometry. The AChE was immobilized on the composite electrode surface by cross-linking with glutaraldehyde and chitosan. The synergistic action of the CoTSPc/CNT/OMIM[BF4] composite showed excellent electrocatalytic activity, with a low applied potential for the amperometric detection of thiocholine (TCh) at 0.0 V vs. Ag/AgCl. The calculated catalytic rate constant, kcat, was 3.67 × 103 mol-1 L s-1. Under the optimum conditions, the inhibition rates of these pesticides were proportional to their concentrations in the ranges of 1.0 pmol L-1 to 1.0 nmol L-1 (fenitrothion), 2.0 pmol L-1 to 8.0 nmol L-1 (dichlorvos), and 16 pmol L-1 to 5.0 nmol L-1 (malathion). 2014.
Editor: Japan Society for Analytical Chemistry
Rights: aberto
Identifier DOI: 
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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