4.7 Article

An electrochemical DNA-based biosensor to study the effects of CdTe quantum dots on UV-induced damage of DNA

Journal

MICROCHIMICA ACTA
Volume 182, Issue 9-10, Pages 1715-1722

Publisher

SPRINGER WIEN
DOI: 10.1007/s00604-015-1502-z

Keywords

DNA-based biosensor; Quantum dots; CdTe nanoparticles; UV-C radiation; DNA damage; Gel electrophoresis

Funding

  1. Scientific Grant Agency VEGA of the Slovak Republic [1/0361/14]
  2. Competence Centre for SMART Technologies for Electronics and Informatics Systems and Services - Research & Development Operational Programme from the ERDF [ITMS 26240220072]
  3. National Scholarship Programme of the Slovak Republic for the Support of Mobility of Students, PhD students, University Teachers, Researchers and Artists (Teodora Ignat) [8632]

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A DNA-based biosensor is presented that can be applied to the detection of DNA damage caused by UV-C radiation (254 nm) in the presence of CdTe quantum dots (QDs). The sensor is composed of a glassy carbon electrode whose surface was modified with a layer of dsDNA and another layer of CdTe QDs. The response of this sensor is based on (a) the intrinsic anodic signal of the guanine moiety in the DNA that is measured by square-wave voltammetry, and (b) the cyclic voltammetric response of the redox indicator system hexacyanoferrate(III/II). Depending on the size of the QDs, they exert a significant effect on the rate of the degradation of dsDNA by UV-C light, and even by visible light. Time-dependent structural changes of DNA include opening of the double helix (as indicated by an increase in the redox response of the guanine moiety due to easy electron exchange with the electrode when compared to the original helix state and by an increase in the voltammetric peak current of the hexacyanoferrate(III/II) anion after degradation of the negatively charged DNA backbone on the electrode). The effects of QDs were verified for salmon sperm DNA and calf thymus DNA, and further corroborated by experiments in which DNA solutions were irradiated in the presence of QDs.

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