Electrochemical detection of HbA1c, a marker [correction of maker] for diabetes, using a flow immunoassay system

Area of Science:

• Analytical Chemistry
• Biomedical Engineering
• Clinical Diagnostics

Background:

• Hemoglobin A1c (HbA1c) is a key biomarker for long-term glycemic control in diabetes.
• Accurate and accessible monitoring of HbA1c is crucial for effective diabetes management.
• Existing methods for HbA1c detection can be complex and time-consuming.

Purpose of the Study:

• To develop an on-chip electrochemical flow immunoassay for sensitive HbA1c detection.
• To integrate boronate-affinity chromatography for efficient separation of HbA1c.
• To create a potential point-of-care testing (POCT) device for glycated protein monitoring.

Main Methods:

• Development of an electrochemical flow system utilizing anti-human hemoglobin IgG labeled with ferrocene monocarboxylic acid (Fc-IgG).
• On-chip separation of HbA1c using a column packed with boronate-activated agarose beads.
• Electrochemical detection of Fc-IgG-HbA1c immunocomplexes after elution with sorbitol.

Main Results:

• Successful separation of HbA1c from non-glycated hemoglobin and free antibodies.
• Linear correlation observed between increased current and HbA1c concentration up to 500 µg/ml.
• Demonstrated feasibility of the assay using hemolysate samples.

Conclusions:

• The developed on-chip electrochemical flow immunoassay system effectively detects HbA1c.
• Boronate-affinity chromatography enhances assay specificity and efficiency.
• This technology provides a foundation for novel POCT devices for diabetes monitoring.