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A novel multi-array immunoassay device for tumor markers based on insert-plug model of piezoelectric immunosensor
Bo Zhang1, Xue Zhang, Hui-hui Yan
1Department of Laboratory, Southwest Hospital, Third Military Medical University, Chongqing 400038, PR China. zbcq@yahoo.com.cn
Biosensors & Bioelectronics
|April 20, 2007
Summary
A new multi-array piezoelectric immunosensor device enables rapid and sensitive detection of key tumor markers like AFP, CEA, PSA, and CA125 in serum. This reusable device offers a reliable alternative for clinical diagnostics.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biosensing Technology
Background:
- Accurate and rapid detection of tumor markers is crucial for early cancer diagnosis and monitoring.
- Existing immunoassay methods can be time-consuming and require complex procedures.
- Development of sensitive and specific biosensors is essential for improving clinical laboratory diagnostics.
Purpose of the Study:
- To develop and characterize a novel multi-array piezoelectric (Pz) immunosensor device for quantitative detection of multiple tumor markers.
- To evaluate the performance of the Pz immunosensor in terms of sensitivity, specificity, reproducibility, and reusability.
- To assess the clinical applicability of the developed immunosensor by comparing its results with a standard method.
Main Methods:
- Fabrication of a multi-array Pz immunosensor using an insert-plug model and screw clamp apparatus.
- Independent oscillation of single immunosensors with high frequency stability in both air and liquid phases.
- Quantitative detection of alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), prostate specific antigen (PSA), and carcinoma antigen 125 (CA125) in human serum.
- Assessment of response characteristics including time-cost, reproducibility, and specificity.
- Comparison of results with chemiluminescence immunoassay (CLIA) using clinical samples.
Main Results:
- The Pz immunosensor demonstrated stable oscillation with frequency stability of +/-1 Hz (air) and +/-2 Hz (liquid).
- Detection ranges were established for AFP (20-640 ng/ml), CEA (1.5-30 microg/ml), PSA (1.5-40 ng/ml), and CA125 (5-150 IU/ml) with a coefficient of variance (CV) < 5%.
- No cross-reactivity was observed with other tumor markers in serum, indicating high specificity.
- Results from clinical samples showed good agreement with CLIA.
- The immunosensor was successfully regenerated and reused for three cycles without significant loss of activity.
Conclusions:
- The developed multi-array Pz immunosensor offers a rapid, sensitive, and specific method for detecting multiple tumor markers.
- The device exhibits excellent reproducibility, stability, and reusability, making it suitable for clinical applications.
- This Pz immunosensor presents a convenient and reliable alternative to existing methods for tumor marker detection in clinical laboratories.
