An Immunosensor for the Detection of ULBP2 Biomarker

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Biomarkers

Background:

• Pancreatic cancer (PC) is a deadly disease with high mortality rates.
• UL16 binding protein 2 (ULBP2) is identified as a potential biomarker for PC detection.
• Development of sensitive and reliable diagnostic tools for PC is crucial.

Purpose of the Study:

• To develop a simple, reliable, and inexpensive immunosensor for ULBP2 antigen detection.
• To investigate the impact of sensor array configuration and zinc oxide (ZnO) nanoparticles on immunosensor sensitivity.

Main Methods:

• Immobilization of ULBP2 antibody onto screen-printed carbon electrodes (SPCEs).
• Comparison of three sensor configurations: simple SPCE, SPCE array (1x2, 1x3), and ZnO nanoparticle-modified SPCE (ULBP2-ZnO/SPCE).
• Impedance spectrum measurements were used to evaluate immunosensor performance.

Main Results:

• The ULBP2-ZnO/SPCE immunosensor demonstrated significantly higher sensitivity (18 times) compared to the simple SPCE.
• The ULBP2-ZnO/SPCE exhibited a low limit of detection (1 pg/mL), high sensitivity, excellent linearity (R² = 0.98), and good stability.
• Sensor array configurations improved signal-to-noise ratio and sensitivity, but less effectively than ZnO modification.

Conclusions:

• Both ZnO nanoparticle modification and sensor array configurations enhance immunosensor sensitivity for ULBP2 detection.
• The ULBP2-ZnO/SPCE immunosensor is the most effective configuration for detecting ULBP2 antigens.
• This developed immunosensor shows potential for early pancreatic cancer diagnosis.