Journal
ANALYTICAL BIOCHEMISTRY
Volume 549, Issue -, Pages 157-163Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ab.2018.03.023
Keywords
Hepatitis B; Genosensor; Electrochemical detection; Gold nanoparticles
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq-306309/2015-7]
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG/TEC) [PPM-00378-12]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
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This work describes different approaches for the detection of hepatitis B virus (HBV) genomic DNA, using electrochemical and optical techniques. The platforms consisted of a single-stranded DNA probe (HEPB1S), specific to HBV, grafted on a gold electrode modified with reduced graphene oxide or gold nanoparticles. Differential pulse voltammetry analysis indicates that the addition of HBV genomic DNA caused an increase of about 1.4 times in the current peak value, when compared to the negative control. It was observed a linear dependence with the log HBV-genomic DNA concentration and the electrochemical biosensor detected until 7.65 pg mu L-1 of the target. Electrochemical impedance spectroscopy measurements showed an increase of about 2 times in the charge transfer resistance, after the addition of HBV genomic DNA. Assays using colloidal suspension of gold nanoparticles showed a shift of the peak wavelength, linearly proportional to the HBV-genomic DNA concentration, with a detection limit of 0.15 ng mu L-1. The applicability of the gold nanoparticles for clinical samples was tested with success in the blood plasma. All the approaches used in this work were effective in detecting genomic DNA or blood plasma in positive samples for HBV.
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