Self-assembled monolayer as a pre-concentrating receptor for selective serotonin sensing

Area of Science:

• Electrochemistry
• Materials Science
• Biomedical Engineering

Background:

• Serotonin (5-hydroxytryptamine, 5-HT) is a crucial neurotransmitter.
• Accurate detection of 5-HT is vital for diagnosing neurological disorders.
• Existing detection methods often lack selectivity and sensitivity in complex matrices.

Purpose of the Study:

• To develop a novel sensing platform for selective pre-concentration and detection of serotonin (5-HT).
• To investigate the use of a mixed self-assembled monolayer (SAM) for enhanced serotonin capture.
• To validate the detection of 5-HT in physiological samples.

Main Methods:

• Formation of a captopril/thiophenol (Capt/TP) mixed SAM on a gold electrode.
• Selective pre-concentration of 5-HT via complex formation.
• Detection using Anodic Stripping Differential Pulse Voltammetry (ASDPV) and Electrochemical Impedance Spectroscopy (EIS).

Main Results:

• The Capt/TP SAM selectively captured 5-HT molecules.
• Detection limits achieved were 1.2 nM (EIS) and 28 nM (ASDPV).
• Successful determination of 5-HT in physiological matrices containing common interfering substances.

Conclusions:

• The Capt/TP SAM provides an effective medium for selective serotonin pre-concentration.
• ASDPV and EIS offer sensitive and reliable methods for 5-HT detection.
• This platform demonstrates potential for clinical applications in neurotransmitter analysis.