Artículos de revistas
Ultrasensitive Biosensor For Detection Of Organophosphorus Pesticides Based On A Macrocycle Complex/carbon Nanotubes Composite And 1-methyl-3-octylimidazolium Tetrafluoroborate As Binder Compound
Registro en:
Analytical Sciences. Japan Society For Analytical Chemistry, v. 31, n. 1, p. 29 - 35, 2015.
9106340
2-s2.0-84924256859
Autor
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.
Institución
Resumen
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. 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