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Development of colloidal gold-based immumochromatographic assay for the rapid detection of medroxyprogesterone acetate residues in biological materials

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A competitive colloidal gold-based immunoassay in lateral-flow format for the rapid detection of medroxyprogesterone acetate (MPA) in biological materials was developed. A nitro-cellulose membrane strip was separately coated with goat anti-rabbit IgG (control line) and MPA hapten-OVA conjugate (test line). Anti-MPA polyclonal antibody labelled with colloidal gold particles was first incubated with MPA. The limit of detection for lateral flow was 5 ng g-1 for detecting an MPA standard solution, and the limit of detection was 10 ng mL-1 for detecting the MPA spiked in pig urine and 10 ng g-1 for spiked in pig liver. The results were confirmed by high-performance liquid chromatography tandem mass spectrometry (HPLC/MS/MS) and indicated that there was a good agreement between both methods (R2 = 0.976). The assay time for the test was less than 5 min, suitable for rapid testing on site.
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Keywords: Colloidal gold-based immunoassay; Lateral-flow; MPA

Document Type: Research Article

Affiliations: School of Food Science and Technology, Southern Yangtze University, JiangSu Province, China

Publication date: April 1, 2007

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