An enhanced glucose biosensor using charge transfer techniques.

Area of Science:

• Biosensors
• Electrochemistry
• Analytical Chemistry

Background:

• Ion-sensitive field-effect transistors (ISFETs) face limitations in detecting small glucose fluctuations due to low theoretical sensitivity and noise interference.
• Existing glucose sensing methods often struggle with signal amplification and achieving high signal-to-noise ratios.

Purpose of the Study:

• To develop and demonstrate an enhanced glucose biosensor using a charge transfer technique (CTTGS) for improved glucose detection.
• To overcome the limitations of ISFETs in measuring small ion fluctuations and amplifying signals.

Main Methods:

• The study employed an accumulation method with a (d-gluconate+H+) ion perception system within the CTTGS.
• Signal integration cycles were utilized to amplify sensing signals without external amplification.
• Experimental validation was performed using the developed CTTGS system.

Main Results:

• The CTTGS demonstrated high signal quality and amplification capabilities through "signal integration cycles".
• The sensor exhibited excellent performance with a large span (1445 mV), good reproducibility, and a sensitivity of 7.22 mV/mM.
• Compared to ISFETs, the CTTGS showed seven times higher sensitivity (7.22 mV/mM vs. 1 mV/mM) and a lower detection limit of 0.01 mM/L.

Conclusions:

• The CTTGS offers significant advantages over traditional ISFET glucose sensors, including high sensitivity, accuracy, and signal-to-noise ratio.
• The developed biosensor is suitable for clinical applications, with high linearity (R²=0.9999) and minimal non-linear error (+/-0.27%) for human glucose levels.
• The CTTGS shows promise for accurate and reliable blood glucose level monitoring.