Glycated Albumin Detection Using Electrochemical Aptasensor for Screening and Monitoring of Diabetes Mellitus

A simple electrochemical aptasensor was developed for the detection of glycated albumin (GHSA) using ssDNA aptamer that selectively binds to GHSA as a recognition element. The biotinylated ssDNA aptamer was immobilized on a streptavidin-modified screen-printed carbon electrode (SPCE). The changes of interfacial features of the electrode surface, which were based on the aptamer-GHSA interaction, were probed in the presence of the redox Fe(CN)6 3- using square wave voltammetry (SWV) measurements (Fig 1). The results showed that limit of detection of our sensor was 3 µg/ml, with a calibration curve to the range of 16 mg/ml. The aptasensor showed high selectivity for GHSA over other molecules that is usually available in the blood. Our aptasensor was successfully applied to detect GHSA in serum samples, which demonstrated the higher levels of GHSA concentrations in diabetes than normal persons. These indicate that our electrochemical aptasensor has a potential for diagnosis and monitoring of diabetes mellitus. Figure 1