Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/54252
Type: Artigo de periódico
Title: Amperometric biosensor for lactate based on Meldola's blue adsorbed on silica gel modified with niobium oxide
Author: Pereira, AC
Macedo, DV
Santos, AS
Kubota, LT
Abstract: A reagentless amperometric biosensor sensitive to lactate was developed. This sensor comprises a carbon paste electrode modified with lactate dehydrogenase (LDH), nicotinamide adenine dinucleotide (NAD(+)) cofactor and Meldola's blue (MB) adsorbed on silica gel coated with niobium oxide. The amperometric response was based on the electrocatalytic properties of MB to oxidize NADH, which was generated in the enzymatic reaction of lactate with NAD(+) under catalysis of LDH. The dependence on the biosensor response was investigated in terms of pH, supporting electrolyte, ionic strength, LDH and NAD(+) amounts and applied potential. The biosensor showed an excellent operational stability (95% of the activity was maintained after 250 determinations) and storage stability (allowing measurements for over than 2.5 months, when stored in a refrigerator). The proposed biosensor also presented good sensitivity allowing lactate quantification at levels down to 6.5 X 10(-6) mol L-1. Moreover, the biosensor showed a wide linear response range (from 0.1 to 14 mmol L-1 for lactate). These favorable characteristics allowed its application for direct measurements of lactate in biological samples such as blood. The precision of the data obtained by the proposed biosensor show reliable results for real complex matrices.
Subject: amperometric biosensor
modified silica gel
NAD(+)
lactate dehydrogenase
lactate determination
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Rights: fechado
Identifier DOI: 10.1002/elan.200603509
Date Issue: 2006
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File Description SizeFormat 
WOS000238561300010.pdf97.47 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.