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Flow injection fluorescence immunoassay for gentamicin using sol-gel-derived mesoporous biomaterial
Huang-Hao Yang1, Qing-Zhi Zhu, Hui-Ying Qu
1Department of Chemistry, The Key Laboratory of Analytical Sciences of MOE, Xiamen University, People's Republic of China.
Analytical Biochemistry
|September 18, 2002
Summary
This study introduces mesoporous sol-gel biomaterials for flow-injection immunoassays. This novel approach enables rapid and reusable detection of gentamicin, offering excellent correlation with HPLC analysis.
Area of Science:
- Biomaterials Science
- Analytical Chemistry
- Immunosensing
Background:
- Sol-gel derived mesoporous materials offer unique properties for biomaterial applications.
- Flow-injection immunoassay systems require robust and reusable bioreactors.
- Gentamicin detection is crucial in various clinical and environmental settings.
Purpose of the Study:
- To develop a novel immunoaffinity column using sol-gel derived mesoporous biomaterials for gentamicin detection.
- To evaluate the performance of the developed system in terms of sensitivity, reusability, and speed.
- To compare the results with established analytical techniques like High-Performance Liquid Chromatography (HPLC).
Main Methods:
- Immobilization of anti-gentamicin antibody within a mesoporous sol-gel matrix using tetramethoxysilane and poly(ethylene glycol).
- Development of an immunoaffinity column for flow-injection immunoassay.
- Competitive assay format using fluorescein isothiocyanate-labeled gentamicin.
- Regeneration of antibody binding sites using a 5 x 10(-3) mol/L NaOH solution.
Main Results:
- The sol-gel material exhibited minimal non-specific adsorption and no antibody leaching under harsh elution conditions.
- The developed immunoassay system allowed for rapid, single assays within 10 minutes without sample preconcentration.
- The system demonstrated high reusability, with the immunoreactor functioning effectively for up to 20 cycles.
- A working range of 250-5000 ng/mL and a detection limit of 200 ng/mL were achieved for gentamicin.
- Excellent correlation was observed between the results from the developed method and HPLC analysis.
Conclusions:
- Sol-gel derived mesoporous biomaterials are effective for developing reusable immunoaffinity columns in flow-injection immunoassay systems.
- This novel approach provides a sensitive, rapid, and cost-effective method for gentamicin detection.
- The developed system shows significant potential for routine analysis and surpasses the performance of some existing immunoassay techniques.