Biochemical Engineering Journal - ARCA: Home

[Pages:15]Biochemical Engineering Journal 110 (2016) 43?50

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Biochemical Engineering Journal

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Regular article

A gold nanoparticle piezoelectric immunosensor using a recombinant antigen for detecting Leishmania infantum antibodies in canine serum

Joilson Ramos-Jesus a,b, Lain Carlos Pontes-de-Carvalho c, Stella M. Barrouin Melo d, Neuza M. Alc?ntara-Neves e, Rosa F. Dutra a,

a Biomedical Engineering Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235 Recife, Pernambuco, Brazil b Biodiversity and Biotechnology Research Group, Federal University of Piau? - UFPI, Parna?ba, Brazil c Gonc? alo Moniz Research Center, Salvador, Bahia, Brazil d Department of Veterinary, Federal University Bahia, Salvador, Brazil e Department of Biointeraction, Federal University of Bahia, Salvador, Bahia, Brazil

article info

Article history: Received 22 July 2015 Received in revised form 27 December 2015 Accepted 29 January 2016 Available online 1 February 2016

Keywords: Immunosensor Quartz crystal microbalance Leishmaniasis Leishmania infantum

a b s t r a c t

Visceral leishmaniasis (VL) is a severe systemic and infectious disease potentially fatal when undiagnosed or untreated. So far, accurate diagnosis is still a problem, especially in endemic areas and in the tracking and screening of asymptomatic dogs, which are good reservoirs and main host in urban areas. Recombinant antigens based on DNA technology have provided more reliable serological diagnostics since the specificity can be achieved easier than using whole extracts. This work reports a sensitive piezeolectric immunosensor for anti-Leishamnia antibodies based on rLci2B recombinant antigens immobilized on quartz crystal electrode. The electrode surface was assembled by a nafion film recovered by gold nanoparticles (AuNPs) to promote a greater amount of rLci2B due to the increase of surface area and stability on bonds. The immunosensor distinguished the positive VL canine serum showing a good linearity (r = 0.989; p ................
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