Extended gate field-effect transistor biosensors for point-of-care testing of uric acid

Weihua Guan, Mark A. Reed

    Research output: Chapter in Book/Report/Conference proceedingChapter

    1 Scopus citations

    Abstract

    An enzyme-free redox potential sensor using off-chip extended-gate field effect transistor (EGFET) with a ferrocenyl-alkanethiol modified gold electrode has been used to quantify uric acid concentration in human serum and urine. Hexacyanoferrate (II) and (III) ions are used as redox reagent. The potentiometric sensor measures the interface potential on the ferrocene immobilized gold electrode, which is modulated by the redox reaction between uric acid and hexacyanoferrate ions. The device shows a near Nernstian response to uric acid and is highly specific to uric acid in human serum and urine. The interference that comes from glucose, bilirubin, ascorbic acid, and hemoglobin is negligible in the normal concentration range of these interferents. The sensor also exhibits excellent long term reliability and is regenerative. This extended gate field effect transistor based sensor is promising for point-of-care detection of uric acid due to the small size, low cost, and low sample volume consumption.

    Original languageEnglish (US)
    Title of host publicationMethods in Molecular Biology
    PublisherHumana Press Inc.
    Pages189-203
    Number of pages15
    DOIs
    StatePublished - Jan 1 2017

    Publication series

    NameMethods in Molecular Biology
    Volume1572
    ISSN (Print)1064-3745

    All Science Journal Classification (ASJC) codes

    • Molecular Biology
    • Genetics

    Fingerprint Dive into the research topics of 'Extended gate field-effect transistor biosensors for point-of-care testing of uric acid'. Together they form a unique fingerprint.

    Cite this