Journal
ANALYTICA CHIMICA ACTA
Volume 548, Issue 1-2, Pages 205-210Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2005.05.058
Keywords
amperometric enzyme immunosensor; gold nanoparticles (nano-Au); hepatitis B; horseradish peroxidase (HRP)
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An amperometric immunosensor based on the gold nanoparticles (nano-Au) and horseradish peroxidase (HRP)-modified gold electrode for the determination of hepatitis B surface antigen (HBsAg) has been developed. The novelty of the methodology was the first use of the HRP, instead of bovine serum albumin (BSA), to block the possible remaining active sites of the gold nanoparticles monolayer, avoid the nonspecific adsorption and amplify the response of the antigen-antibody reaction at the same time. Tests performed with this immunosensor showed good linearity and sensitivity when it was evaluated on several clinical samples. The system was optimized to realize a reliable determination of HBsAg in the range of 2.56-563.2 ng/ml with a detection limit of 0.85 ng/ml. Moreover, the proposed sensor was comparable to BSA-blocked immunosensor in terms of the linearity and sensitivity. (c) 2005 Elsevier B.V. All rights reserved.
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