Silver Microdisc Array Electrode Chip for Urea Detection in Saliva Samples from Patients with Chronic Nephritis

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Biomedical Diagnostics

Background:

• Urea is a key biomarker for kidney and liver disorders.
• Current diagnostic methods often involve invasive blood sampling.
• Electrochemical urea detection in saliva is limited by inefficient material deposition on electrodes.

Purpose of the Study:

• To develop a highly sensitive and noninvasive electrochemical sensor for urea detection in saliva.
• To overcome limitations of traditional electrode fabrication methods for improved urea quantification.
• To establish a reliable platform for clinical diagnosis using saliva as a liquid biopsy.

Main Methods:

• Fabrication of a silver nanoparticle (AgNP)-integrated microdisc array electrode chip.
• In situ growth of AgNPs on polydopamine (PDA) arrays patterned via microcontact printing (μCP) on an indium tin oxide (ITO) substrate.
• Electrochemical analysis of urea in saliva samples.

Main Results:

• The AgNP microdisc array sensor demonstrated significantly higher sensitivity and material utilization compared to drop-cast electrodes.
• Enhanced mass transfer properties contributed to improved detection performance.
• The sensor exhibited superior selectivity and achieved reliable urea quantification in clinical saliva samples from nephritis patients.

Conclusions:

• The developed AgNP microdisc array electrode chip offers a promising noninvasive platform for sensitive urea determination.
• This technology has great potential for advancing clinical diagnosis through liquid biopsy applications.
• The sensor design overcomes limitations of traditional methods, enabling efficient and selective urea sensing.