Highly sensitive capacitance-based nitrite sensing using polydopamine/AuNPs-modified screen-printed carbon electrode

Area of Science:

• Electrochemistry
• Materials Science
• Food Science

Background:

• Regulatory bodies set limits for food additives like nitrite to ensure consumer safety.
• Nitrite is used in processed meats to inhibit bacterial growth and degradation.
• Developing sensitive detection methods for nitrite is essential for food quality control.

Purpose of the Study:

• To develop a sensitive and versatile method for nitrite detection using electrochemical techniques.
• To utilize the redox properties of polydopamine and gold nanoparticles for enhanced sensing.
• To validate the sensor's performance in real-world food samples.

Main Methods:

• Fabrication of a sensor using electrochemically deposited polydopamine (pDA) on gold nanoparticle (AuNP)-modified screen-printed electrodes (SPCE).
• Utilizing redox capacitance spectroscopy to detect nitrite ions based on changes in redox distribution.
• Testing the sensor's linear response range and limit of detection for nitrite.

Main Results:

• The developed sensor demonstrated a linear response for nitrite detection from 10 to 500 μM.
• Achieved a low limit of detection of 1.98 μM (S/N = 3).
• Successfully analyzed nitrite levels in processed meat samples with good recovery rates.

Conclusions:

• The AuNPs/pDA modified SPCE sensor is a promising tool for sensitive and routine nitrite detection.
• The redox capacitance spectroscopy approach offers a versatile method for ion sensing.
• This technology can contribute to enhanced food safety monitoring and quality assurance.