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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Biomimetic sensor based on 5,10,15,20-tetrakis(pentafluorophenyl)-21H,23H-porphyrin iron (III) chloride and MWCNT for selective detection of 2,4-D

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Author(s):
Wong, Ademar [1] ; Taboada Sotomayor, Maria Del Pilar [1]
Total Authors: 2
Affiliation:
[1] State Univ Sao Paulo UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 181, p. 332-339, MAY 2013.
Web of Science Citations: 20
Abstract

Exploitation of the electronic properties of carbon nanotubes for the development of voltammetric and amperometric sensors to monitor analytes of environmental relevance has increased in recent years. This work reports the development of a biomimetic sensor based on a carbon paste modified with 5,10,15,20-tetrakis(pentafluorophenyl)-21H,23H-porphyrin iron (III) chloride (a biomimetic catalyst of the P450 enzyme) and multi-wall carbon nanotubes (MWCNT), for the sensitive and selective detection of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). The sensor was evaluated using cyclic voltammetry and amperometry, for electrochemical characterization and quantification purposes, respectively. Amperometric analyses were carried out at -100 mV vs. Ag/AgCl(KClsat), using a 0.1 mol L-1 phosphate buffer solution at pH 6.0 as the support electrolyte. Under these optimized analytical conditions, the sensor showed a linear response between 9.9 x 10(-6) and 1.4 x 10(-4) mol L-1, a sensitivity of 1.8 x 10(4) (+/- 429) mu A Lmol(-1), and limits of detection and quantification of 2.1 x 10(-6) and 6.8 x 10(-6) mol L-1, respectively. The incorporation of functionalized MWCNT in the carbon paste resulted in a 10-fold increase in the response, compared to that of the biomimetic sensor without MWCNT. In addition, the low applied potential (-100 mV) used to obtain high sensitivity also contributed to the excellent selectivity of the proposed sensor. The viability of the application of this sensor for analysis of soil samples was confirmed by satisfactory recovery values, with a mean of 96% and RSD of 2.1% (n = 3). (C) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/12296-6 - Bi-biomimetic systems based on nanoparticles and nanoporous materials to obtain high sensitive and selective methods for determination of pesticides and dyes
Grantee:Maria Del Pilar Taboada Sotomayor
Support type: Regular Research Grants