Abstract
Objective: To evaluate a novel surface plasmon resonance (SPR) system for the direct measurement of tumor marker carbohydrate antigen 15-3 (CA15-3) in human saliva. Design and methods: We measured the presence of the tumor marker carbohydrate antigen 15-3 (CA15-3) in human saliva using 2 different surface plasmon resonance (SPR) systems. To compare the sensitivity of an SPR biosensor based on thin-film Au/ZnO and the Biacore SPR system, we prepared CA15-3 samples in saliva and analyzed intensity responses to the samples at various concentrations of CA15-3. Results: The linear detection range of CA15-3 in human saliva with the SPR system based on thin-film Au/ZnO was 2.5-20. U/mL (the cut-off point in cancer patients is around 4. U/mL). The linear range with the Biacore SPR system was 40-300. U/mL. Conclusions: These results show that thin-film Au/ZnO-based SPR systems have higher sensitivity and can be used for measuring the levels of CA15-3 in human saliva without concentrating the samples.
Original language | English |
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Pages (from-to) | 1689-1693 |
Number of pages | 5 |
Journal | Clinical Biochemistry |
Volume | 45 |
Issue number | 18 |
DOIs | |
State | Published - 12 2012 |
Externally published | Yes |
Keywords
- Biacore SPR
- Gold/zinc oxide
- Saliva carbohydrate antigen 15-3
- Surface plasmon resonance