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Type: Artigo de periódico
Title: Determination of phenolic compounds based on co-immobilization of methylene blue and HRP on multi-wall carbon nanotubes
Author: Santos, AS
Pereira, AC
Sotomayor, MDRT
Tarley, CRT
Duran, N
Kubota, LT
Abstract: This work evaluated an amperometric biosensor based on multi-wall carbon nanotubes (MWCNT), chemically modified with methylene blue (Met) and horseradish peroxidase (HRP), for detection of phenolic compounds. The dependences of the biosensor response due to the enzyme immobilization procedure, HRP amounts, pH and working potential were investigated. The amperometric response for catechol using the proposed biosensor showed a very wide linear response range (1 to 150 mu mol L-1), good sensitivity (50 nA cm(-2) mu mol(-1) L), excellent operational stability (after 300 determinations the response remained at 97%) and very good storage stability (lifetime > 3 months). Based on all these characteristics, it is possible to affirm that the material is promising for phenol detection due to its good electrochemical response and enzyme stabilization. The biosensor response for various phenolic compounds was investigated.
Subject: multi-wall carbon nanotubes
methylene blue
horseradish peroxidase
phenolic compounds
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Citation: Electroanalysis. Wiley-v C H Verlag Gmbh, v. 19, n. 5, n. 549, n. 554, 2007.
Rights: fechado
Identifier DOI: 10.1002/elan.200603759
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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