Synergie between molecular imprinted polymer based on solid-phase extraction and quartz crystal microbalance technique for 8-OHdG sensing

Biosens Bioelectron. 2008 Dec 1;24(4):742-7. doi: 10.1016/j.bios.2008.06.058. Epub 2008 Jul 12.

Abstract

Recently, the 8-hydroxy-2'-deoxyguanosine (8-OHdG) has been used as a marker to determine the oxidative stress. There is no any cheap and easy determination method based on chips and sensor systems for the determination of 8-OHdG. In this study, we have proposed imprinting methods for 8-OHdG recognition and determination using methacryloylamidohistidine-platinum(II) [MAH-Pt(II)] as a new metal-chelating monomer. The study includes the solid-phase extraction (SPE) of blood sample by a new 8-OHdG imprinted sorbent and the measurement of binding interaction of 8-OHdG imprinted quartz crystal microbalance (QCM) sensor via ligand interaction. 8-OHdG imprinted sorbent has prepared by bulk polymerization of MAH-Pt(II) and N-N'-methylenebisacrylamide. 8-OHdG imprinted sensor has prepared on a QCM chip coating the thiol pretreated Au electrode. At the end of these steps, a thin molecular imprinted polymer (MIP) film for the detection of 8-OHdG has developed and analytical performance of QCM sensor which has prepared using MIP was investigated. The affinity constant (K(a)) for 8-OHdG using MAH-Pt-based thin film has determined by using the Scatchard method. The average percentage recovery of 8-OHdG from plasma samples was found as 80% by using of 8-OHdG imprinted SPE material. At the last step, 8-OHdG level in several blood plasma has been determined by this improved QCM sensor. The obtained results confirmed that the 8-OHdG level in cancer patient's blood was significantly higher than in general subjects.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 8-Hydroxy-2'-Deoxyguanosine
  • Biosensing Techniques / instrumentation*
  • Biosensing Techniques / methods
  • Chelating Agents / chemistry
  • Crystallization / methods
  • Deoxyguanosine / analogs & derivatives*
  • Deoxyguanosine / analysis
  • Equipment Design
  • Equipment Failure Analysis
  • Micro-Electrical-Mechanical Systems / instrumentation*
  • Polymers / chemistry
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Solid Phase Extraction / instrumentation*
  • Solid Phase Extraction / methods
  • Surface Properties

Substances

  • Chelating Agents
  • Polymers
  • 8-Hydroxy-2'-Deoxyguanosine
  • Deoxyguanosine