Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 92, Issue -, Pages 42-49Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2011.11.023
Keywords
Studded graphite; Silver nanoparticles; CPE; Heme proteins; Peroxide; Nitrite
Funding
- Instituto Egipcio de Estudios Islamicos en Espana
- University of Cadiz
- Junta de Andalucia [FQM249, P08-FQM-04006]
- Ministerio de Ciencia e Innovacion of Spain
- FEDER [CTQ2010-19058]
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The impregnation of graphite grains with silver nanoparticles (AgNPs) is proposed for making a novel carbon paste electrode (CPE). The resulting material promotes direct electron transfer and direct biocatalysis of embedded heme protein. It is demonstrated that the impregnation of graphite grains with AgNPs of 16-25 nm, incorporated in a CPE, can promote measurable bio-electrochemical phenomena involving hemoglobin and myoglobin. Unlike other biosensors prepared with simple carbon, those based on carbon grains studded with AgNPs show well-defined and quasi-reversible voltammetric peak with heterogeneous electron transfer rate k(s) of approximately 0.037 +/- 0.007 and 0.013 +/- 0.005 s(-1) for hemoglobin and myoglobin, respectively. The embedded proteins also retain their bio-catalytical activity for hydrogen peroxide and nitrite reduction with linear ranges of 0.5-3000 mu M and 30-150 mu M, sensitivities of 73.6 +/- 0.6 nA mu M-1 and 5.72 +/- 0.11 nA mu M-1, and detection limits close to 0.08 mu M and 5.80 mu M, for these two analytes respectively. These results support the viability of this preliminary approach for the development of advanced third-generation biosensors. (C) 2011 Elsevier B.V. All rights reserved.
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