Sensitive Electrochemical Capsaicin Sensor Based on a Screen Printed Electrode Modified with Poly(sodium...

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Sensing

Background:

• Capsaicin detection is crucial for food safety and quality control.
• Developing sensitive and selective electrochemical sensors is an active research area.
• Functionalized graphite electrodes offer promising platforms for electrochemical sensing applications.

Purpose of the Study:

• To construct a sensitive capsaicin sensor using a poly(sodium 4-styrenesulfonate) functionalized graphite modified screen printed electrode (PSS-Grp/SPE).
• To investigate the electrochemical performance of the PSS-Grp/SPE for capsaicin detection.
• To compare the performance of PSS-Grp/SPE with poly(diallyldimethylammonium chloride) functionalized graphite (PDDA-Grp/SPE).

Main Methods:

• Synthesis of PSS-Grp and PDDA-Grp via sonication.
• Characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis spectroscopy.
• Electrochemical sensing of capsaicin using differential pulse stripping voltammetry (DPSV).

Main Results:

• PSS-Grp/SPE exhibited a significantly higher current density (33 μA cm⁻²) compared to PDDA-Grp/SPE (1.5 μA cm⁻²) in 50 μM capsaicin.
• Capsaicin showed better interaction with the strong negative charges on the PSS-Grp/SPE surface.
• Direct electrochemical sensing of capsaicin was successfully achieved.

Conclusions:

• The PSS-Grp/SPE is a highly sensitive platform for capsaicin detection.
• The strong negative charge of PSS-Grp enhances the electrochemical response for capsaicin.
• This sensor offers a promising approach for direct electrochemical sensing of capsaicin.