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J Environ Sci Health B ; 53(4): 229-236, 2018 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-29319411

RESUMO

The aim of this study was to develop a cantilever nanobiosensor for atrazine detection in liquid medium by immobilising the biological recognition element (tyrosinase vegetal extract) on its surface with self-assembled monolayers using gold, 16-mercaptohexadecanoic acid, 1-ethyl-3-[3-dimethylaminopropyl] carbodiimide hydrochloride/n-hydroxysuccinimide. Cantilever nanobiosensors presented a surface compression tension increase when atrazine concentrations were increased, with a limit of detection and limit of quantification of 7.754 ppb (parts per billion) and 22.792 ppb, respectively. From the voltage results obtained, the evaluation of atrazine contamination in river and drinking water were very close to those of the reference sample and ultrapure water, demonstrating the ability of the cantilever nanobiosensor to distinguish different water samples and different concentrations of atrazine. Cantilever nanosensor surface functionalization was characterised by combining polarisation modulation infrared reflection-absorption spectroscopy and atomic force microscopy and indicating film thickness in nanometric scale (80.2 ± 0.4 nm). Thus, the cantilever nanobiosensor developed for this study using low cost tyrosinase vegetal extract was adequate for atrazine detection, a potential tool in the environmental field.


Assuntos
Atrazina/análise , Técnicas Biossensoriais , Monofenol Mono-Oxigenase/metabolismo , Nanotecnologia , Água Potável/química , Contaminação de Alimentos/análise , Ouro/química , Herbicidas/análise , Imidas/química , Limite de Detecção , Musa/química , Musa/enzimologia , Ácidos Palmíticos/química , Extratos Vegetais/química , Propilaminas/química , Rios/química , Propriedades de Superfície
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