Graphene oxide modified single-use electrodes and their application for voltammetric miRNA analysis

Area of Science:

• Electrochemistry
• Biosensors
• Nanomaterials

Background:

• MicroRNAs (miRNAs) play crucial roles in cellular processes and disease development.
• miRNA-34a is implicated in the pathogenesis of Alzheimer disease.
• Development of sensitive and selective detection methods for miRNAs is essential.

Purpose of the Study:

• To develop and characterize a novel electrochemical biosensor for the detection of miRNA-34a.
• To investigate the application of graphene oxide (GO) modified pencil graphite electrodes (PGEs) for miRNA monitoring.
• To explore DNA-RNA hybridization for specific miRNA recognition.

Main Methods:

• Modification of pencil graphite electrodes (PGEs) with graphene oxide (GO).
• Electrochemical characterization using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM).
• Voltammetric monitoring of miRNA-34a using differential pulse voltammetry (DPV) with DNA-RNA hybridization.

Main Results:

• Successful modification of PGEs with GO was confirmed.
• The developed CA/GO/PGE biosensor demonstrated sensitive detection of miRNA-34a.
• Optimization of GO concentration, DNA probe concentration, and miRNA-34a concentration was achieved.
• The biosensor exhibited good selectivity for miRNA-34a.

Conclusions:

• Graphene oxide modified pencil graphite electrodes offer a promising platform for electrochemical miRNA detection.
• The developed biosensor provides a sensitive and selective method for monitoring miRNA-34a.
• This approach holds potential for early diagnosis and monitoring of Alzheimer disease.