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Sensitive determination of estriol-16-glucuronide using surface plasmon resonance sensing
Xiuqian Jiang1, Mark Waterland, Len Blackwell
1Institute of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.
Steroids
|May 26, 2009
Summary
A novel surface plasmon resonance (SPR) biosensor enables sensitive detection of estriol-16-glucuronide (E3-16G) without sample pretreatment. Gold nanoparticles enhance sensitivity, achieving detection as low as 14 pg/mL in minutes.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biotechnology
Background:
- Accurate quantification of estriol-16-glucuronide (E3-16G), a key estriol metabolite, is crucial for clinical diagnostics.
- Existing methods for E3-16G detection often involve complex and time-consuming sample preparation.
- Development of rapid, sensitive, and user-friendly detection assays is highly desirable.
Purpose of the Study:
- To develop a simple, highly sensitive immunoassay for quantifying low levels of E3-16G in liquid media.
- To utilize a surface plasmon resonance (SPR) biosensor for real-time, label-free detection.
- To enhance the assay's sensitivity using gold nanoparticles and assess the stability of the developed biosensor.
Main Methods:
- Conjugation of E3-16G to ovalbumin (OVA) via an oligoethylene glycol (OEG) linker to form E3-16G-OEG-OVA conjugates.
- Immobilization of E3-16G-OEG-OVA onto a carboxymethyl dextran-coated sensor chip for inhibition immunoassay development.
- Application of a rabbit anti-sheep primary antibody and gold nanoparticles as labels to enhance detection sensitivity.
- Optimization of the SPR biosensor for rapid detection and regeneration cycles.
Main Results:
- A limit of detection (LOD) of 76 pg/mL was initially achieved with the SPR biosensor.
- The assay sensitivity was significantly improved to 14 pg/mL using gold nanoparticle enhancement.
- The enhanced assay provided quantitative results for E3-16G in aqueous samples within 7.5 minutes.
- The immobilized E3-16G-OEG-OVA surface demonstrated high stability, with no significant loss of binding capability after over 1000 cycles.
Conclusions:
- The developed SPR biosensor offers a simple, rapid, and highly sensitive method for E3-16G quantification.
- Gold nanoparticle enhancement dramatically improves the assay's limit of detection.
- The biosensor's robustness and reusability reduce research costs and facilitate practical applications.
- This immunoassay is suitable for the quantitative evaluation of low estriol metabolite levels in various liquid samples.
