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Updated: Feb 10, 2026

A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
MWCNT-Au-Pt hybrid nanocomposite-based electrochemical immunosensor for FGF-2 detection: a novel strategy for anxiety
Nil Su Çaylayik1, Vasfiye Hazal Özyurt2,3, Burak Ekrem Çitil4
1Faculty of Science, Chemistry Department, Mugla Sitki Kocman University, 48000, Kotekli, Mugla, Turkey.
Abstract:
The accurate diagnosis of anxiety disorders remains challenging, as current detection methods primarily rely on subjective questionnaires. In this study, a novel electrochemical biosensor for the detection of fibroblast growth factor-2 (FGF-2), a biomarker associated with anxiety disorders, was developed for the first time. The sensing principle was based on monitoring the impedimetric signal changes generated by the interaction between anti-FGF-2 and the FGF-2 antigen, using a carbon screen-printed electrode as the transducer. To enhance the sensitivity and overall performance of the biosensor, a multi-walled carbon nanotube-gold-platinum (MWCNT-Au-Pt) hybrid nanocomposite was incorporated into the immunosensor structure. Critical parameters-including the amount of MWCNT-Au-Pt, the concentration, incubation time, and temperature of anti-FGF-2, as well as the incubation time and temperature for the anti-FGF-2/FGF-2 interaction-were systematically optimized. Under optimized conditions, the developed impedimetric FGF-2 immunosensor exhibited a linear response in the range of 10-100 ng/mL, with a limit of detection of 1.01 ng/mL and a limit of quantification of 3.10 ng/mL. The specificity of the sensor was confirmed in the presence of potential interfering substances. For real sample analysis, human saliva samples (n = 30) were diluted appropriately and spiked with FGF-2 at concentrations of 20, 50, and 75 ng/mL. The obtained recovery values demonstrated that the developed impedimetric FGF-2 immunosensor is highly suitable for real-sample applications and holds significant potential as a reliable tool for the detection of anxiety disorders.
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