Abstract

Field-effect-based devices are becoming a basic structural element in a new generation of microbiosensors. Reliable molecular characterization of DNA and/or RNA is of paramount importance for disease diagnostics and to follow up alterations in gene expression profiles. The use of such devices for point-of-need diagnostics has been hindered by the need of standard or real-time PCR amplification procedures. The present work focuses on the development of a tantalum pentoxide (Ta2O5) based sensor for the real-time label free detection of DNA amplification via loop mediated isothermal amplification (LAMP) allowing for quantitative analysis of the cMYC proto-oncogene. The strategy based on the field effect sensor was tested within a range of 1 x 10(8)-10(11) copies of target DNA, and a linear relationship between the log copy number of the initial template DNA and threshold time was observed allowing for a semi-quantitative analysis of DNA template. The concept offers many of the advantages of isothermal quantitative real-time DNA amplification in a label free approach and may pave the way to point-of-care quantitative molecular analysis focused on ease of use and low cost.
Original languageEnglish
Pages (from-to)50-55
Number of pages6
JournalBiosensors & Bioelectronics
Volume52
Issue numberNA
DOIs
Publication statusPublished - 15 Feb 2014

Keywords

  • DNA
  • LAMP
  • Isothermal amplification
  • EIS
  • Ion sensitive field effect sensors
  • Tantalum pentoxide
  • qRT-PCR
  • Real time
  • c-Myc
  • Cancer
  • Label free

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