A selective LSPR biosensor for molecular-level glycated albumin detection

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Materials Science

Background:

• Glycated albumin (GA) is a critical biomarker for assessing long-term glycemic control in diabetes management.
• Conventional GA monitoring methods can be time-consuming and expensive.
• There is a need for rapid, sensitive, and cost-effective biosensors for diabetes monitoring.

Purpose of the Study:

• To develop and characterize a novel biosensor for the detection of glycated albumin (GA).
• To utilize localized surface plasmon resonance (LSPR) for signal transduction in GA detection.
• To evaluate the biosensor's sensitivity, specificity, and reusability for practical diabetes monitoring.

Main Methods:

• Fabrication of a biosensor using gold nanoparticles deposited on a quartz substrate via flame spray pyrolysis.
• Conjugation of DNA aptamers to the sensor surface for selective binding of GA.
• Utilizing LSPR to detect wavelength shifts upon GA binding, correlating to mean glucose levels over three weeks.
• Performing selectivity assays with various molecules and assessing sensor reusability.

Main Results:

• The biosensor demonstrated a detection limit of 0.1 μM for GA, within the physiological range (20-240 μM).
• High specificity was observed through selectivity experiments with diverse molecules.
• The biosensor showed promising reusability, indicating practical applicability.
• The LSPR-based detection correlated with patient glycation status, reflecting mean glucose levels over three weeks.

Conclusions:

• The developed LSPR biosensor offers a novel, sensitive, and specific method for detecting glycated albumin.
• The fabrication process and aptamer conjugation provide a robust platform for diabetes monitoring.
• This biosensor presents a promising, rapid, and inexpensive approach for enhanced diabetes diagnosis and management.