Nonenzymatic all-solid-state coated wire electrode for acetylcholine determination in vitro.

Area of Science:

• Electrochemistry
• Biosensors
• Analytical Chemistry

Background:

• Acetylcholine is a critical neurotransmitter involved in various physiological processes.
• Accurate detection of acetylcholine is essential for neurological research and diagnostics.
• Existing acetylcholine sensors often face limitations in stability, selectivity, or non-enzymatic operation.

Purpose of the Study:

• To develop and characterize a nonenzymatic, all-solid-state coated wire electrode for acetylcholine detection.
• To evaluate the performance of the electrode in terms of sensitivity, selectivity, stability, and applicability in biological matrices.

Main Methods:

• Fabrication of a coated wire electrode using poly(3,4-ethylenedioxythiophene) (PEDOT/PSS) as a conducting polymer.
• Incorporation of heptakis(2,3,6-tri-Ο-methyl)-β-cyclodextrin as an ionophore in the selective membrane.
• Electrochemical characterization of the electrode's performance across varying pH, temperature, and acetylcholine concentrations.

Main Results:

• The electrode demonstrated stable operation within a pH range of 6.5-8.5 and temperature range of 15-40°C.
• A wide linear concentration range (10⁻⁵–10⁻¹ M) for acetylcholine was achieved with a sensitivity of 54.04±1.70 mV/decade.
• A low detection limit of 5.69±1.06 µM was obtained, with good selectivity, reproducibility, and stability.
• Successful application in detecting acetylcholine in rat brain homogenate was confirmed.

Conclusions:

• The developed nonenzymatic acetylcholine electrode offers a promising alternative for sensitive and selective neurotransmitter detection.
• The all-solid-state, coated wire design enhances stability and simplifies practical application.
• This sensor shows potential for real-time monitoring of acetylcholine in complex biological samples.