Ferrocene-labelled electroactive aptamer-based sensors (aptasensors) for glycated haemoglobin

Xue Qing Feng, Yi Ju, Wei-Tao Dou, Qing Li, Zhong-Gan Jin, Xiao-Peng He, Tony James, Bang-Ce Ye

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

Abstract

Glycated haemoglobin (HbA1c) is a diagnostic biomarker for type 2 diabetes. Traditional analytical methods for haemoglobin (Hb) detection rely on chromatography, which requires significant instrumentation and is labour-intensive; consequently, miniaturized devices that can rapidly sense HbA1c are urgently required. With this research, we report on an aptamer-based sensor (aptasensor) for the rapid and selective electrochemical detection of HbA1c. Aptamers that specifically bind HbA1c and Hb were modified with a sulfhydryl and ferrocene group at the 3′ and 5′-end, respectively. The modified aptamers were coated through sulfhydryl-gold self-assembly onto screen printed electrodes, producing aptasensors with built in electroactivity. When haemoglobin was added to the electrodes, the current intensity of the ferrocene in the sensor system was reduced in a concentration-dependent manner as determined by differential pulse voltammetry. In addition, electrochemical impedance spectroscopy confirmed selective binding of the analytes to the aptamer-coated electrode. This research offers new insight into the development of portable electrochemical sensors for the detection of HbA1c
Original languageEnglish
Article number7077
JournalMolecules
Volume26
Issue number23
Early online date23 Nov 2021
DOIs
Publication statusPublished - 1 Dec 2021

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