Electrochemical nucleic acid hybridization biosensor based on poly(L-Aspartic acid)-modified electrode for the detection of short oligonucleotide sequences related to hepatitis C virus 1a
| Autor: | Leman Çağdaş, Soner Donmez, Fatma Arslan, Halit Arslan |
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| Rok vydání: | 2019 |
| Předmět: |
Pencil graphite electrode
Hepatitis C virus Immobilized Nucleic Acids Oligonucleotides Biosensing Techniques Hepacivirus Electrochemistry medicine.disease_cause Biochemistry Nucleic acid thermodynamics Aspartic acid medicine Humans Electrodes Oligonucleotide Chemistry Nucleic Acid Hybridization General Medicine Electrochemical Techniques biochemical phenomena metabolism and nutrition Combinatorial chemistry Hepatitis C Electrode DNA Probes Peptides Biosensor Biotechnology |
| Zdroj: | Preparative biochemistrybiotechnology. 49(9) |
| ISSN: | 1532-2297 |
| Popis: | This work describes, for the first time, the fabrication of poly(L-aspartic acid) (PAA) film modified pencil graphite electrode (PGE) for the detection of hepatitis C Virus 1a (HCV1a). The presence of PAA on the electrode surface can provide free carboxyl groups for covalent binding of biomolecules. The PGE surface was first coated with PAA via electropolymerization of the L-aspartic acid, and avidin was subsequently attached to the PAA modified electrode by covalent attachment. Biotinylated HCV1a probes were immobilized on avidin/PAA/PGE via avidin-biotin interaction. The morphology of PAA/PGE was examined using a scanning electron microscope. The hybridization events were monitored with square wave voltammetry using Meldola's blue (MDB). Compared to non-complementary oligonucleotide sequences, when hybridization was carried out between the probe and its synthetic targets or the synthetic polymerase chain reaction analog of HCV1a, the highest MDB signal was observed. The linear range of the biosensor was 12.5 to 100 nM and limit of detection was calculated as 8.7 nM. The biosensor exhibited favorable stability over relatively long-term storage. All these results suggest that PAA-modified electrode can be used to nucleic acid biosensor application and electropolymerization of L-aspartic acid can be considered as a good candidate for the immobilization of biomolecules. |
| Databáze: | OpenAIRE |
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