High sensitivity cardiac troponin I detection in physiological environment using AlGaN/GaN High Electron Mobility Transistor (HEMT) Biosensors

Indu Sarangadharan, Abiral Regmi, Yen Wen Chen, Chen Pin Hsu, Pei chi Chen, Wen Hsin Chang, Geng Yen Lee, Jen Inn Chyi, Shu Chu Shiesh, Gwo Bin Lee, Yu Lin Wang

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

In this study, we report the development of a high sensitivity assay for the detection of cardiac troponin I using electrical double layer gated high field AlGaN/GaN HEMT biosensor. The unique gating mechanism overcomes the drawback of charge screening seen in traditional FET based biosensors, allowing detection of target proteins in physiological solutions without sample processing steps. Troponin I specific antibody and aptamer are used as receptors. The tests carried out using purified protein solution and clinical serum samples depict high sensitivity, specificity and wide dynamic range (0.006–148 ng/mL). No additional wash or sample pre-treatment steps are required, which greatly simplifies the biosensor system. The miniaturized HEMT chip is packaged in a polymer substrate and easily integrated with a portable measurement unit, to carry out quantitative troponin I detection in serum samples with<2 µl sample volume in 5 min. The integrated prototype biosensor unit demonstrates the potential of the method as a rapid, inexpensive, high sensitivity CVD biomarker assay. The highly simplified protocols and enhanced sensor performance make our biosensor an ideal choice for point of care diagnostics and personal healthcare systems.

Original languageEnglish
Pages (from-to)282-289
Number of pages8
JournalBiosensors and Bioelectronics
Volume100
DOIs
StatePublished - 15 Feb 2018

Keywords

  • Electrical double layer gated AlGaN/GaN HEMT biosensor
  • High sensitivity cardiac Troponin I detection
  • Personal healthcare
  • Point of care diagnostics

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