Plasmon-associated DNA genotyping based on crystalline assemblies of metallic carbon nanotubes

Author:

Grushevskaya H. V.1ORCID,Egorova V. P.2,Krylova N. G.3ORCID,Babenka A. S.4ORCID,Krylov G. G.1ORCID

Affiliation:

1. Physics Department, Belarusian State University, 4 Nezalezhnosti Ave., 220030 Minsk, Belarus

2. Belarusian State Pedagogical University, Sovetskaya Str. 18, 220030 Minsk, Belarus

3. Belarusian State Agrarian Technical University, 99 Nezalezhnasti Ave., 220012 Minsk, Belarus

4. Belarusian State Medical University, 83 Dzerzhinski Ave., 220116 Minsk, Belarus

Abstract

Sensitivity and selectivity of modern electrochemical genotyping methods are insufficient to detect a single-oligonucleotide mismatch in low-concentration native DNA samples. Novel methods of tuning, controlling, and monitoring plasmon modes are necessary to achieve attomolar and higher sensitivity for the modern graphene-based transducers of molecular signals. The electrochemical DNA assay is promising one for applications in the molecular diagnostics of tumors with the genome single-nucleotide polymorphism (SNP) for simultaneously discriminating both wild-type and mutant alleles of the gene in very small concentrations. We offer the plasmon-associated DNA-genotyping method based on the screening effects in assemblies of Raman-optically active conjugates comprising DNA and metallic carbon nanotubes. The impedimetric DNA sensors of non-Faradaic type based on the plasmonic screening effect can be more sensitive than the Raman optical transducer based on Raman DNA optical activity resulting in the plasmon resonance due to liability of the Raman transducer parameters to environmental influence.

Publisher

World Scientific Pub Co Pte Ltd

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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