A new analytical cell for carbohydrate analysis with a maintenance-free reference electrode.

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Biomedical Engineering

Background:

• Traditional electrochemical cells often require regular maintenance, particularly for reference electrodes.
• Reference electrode filling solutions can introduce junction potentials, affecting measurement accuracy.
• pH fluctuations can impact the stability and reproducibility of electrochemical measurements, especially for carbohydrate analysis.

Purpose of the Study:

• To introduce a novel electrochemical cell for carbohydrate analysis.
• To develop and evaluate a completely maintenance-free reference electrode for electrochemical applications.
• To improve the reproducibility and reliability of carbohydrate measurements by mitigating pH-related interferences.

Main Methods:

• Construction of a three-electrode electrochemical cell using a gold working electrode, stainless steel counter electrode, and a solid-state palladium reference electrode.
• Utilization of PEEK, Kel-F, and Teflon for fluid-path cell components.
• Implementation of a control module with a three-pulse waveform for selectable potentials, pulse durations, and adjustable signal acquisition delay.

Main Results:

• The solid-state palladium reference electrode demonstrated complete maintenance-free operation.
• The pH-sensitive reference electrode effectively compensated for pH shifts, enhancing the reproducibility of measurements.
• The electrochemical cell performed reliably for over 2700 injections of a glucose standard across 6 weeks without any maintenance.

Conclusions:

• The developed electrochemical cell offers a robust and reliable platform for carbohydrate analysis.
• The maintenance-free, pH-compensating palladium reference electrode significantly advances electrochemical sensing technology.
• This system provides a versatile and stable solution for long-term, unattended electrochemical monitoring.