Nedosekin DA, Brusnichkin AV, Luk'yanov AY, Eremin SA, Proskurnin MA. Heterogeneous thermal-lens immunoassay for small organic compounds: determination of 4-aminophenol.
APPLIED SPECTROSCOPY 2010;
64:942-948. [PMID:
20719060 DOI:
10.1366/000370210792081136]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
4-Aminophenol was selected as a model hapten for thermal-lens detection in a heterogeneous indirect immunoassay for small organic compounds. The assay is based on the competition of the free hapten and 4-aminophenol labeled with tetramethyl rhodamine isothiocyanate (TRITC) for rabbit anti-4-aminophenol antibodies (4-AP-GA-BSA) immobilized on a transparent poly(ethylene terephthalate) plate. The amount of the colored analyte was directly measured by thermal lensing at the plate surface. The developed method is specific for 4-aminophenol. The limit of detection is 2 x 10(-7) M, which corresponds to the absolute amount of 3 x 10(-11) mol of 4-aminophenol. The sensitivities of the developed thermal-lens and fluorescence-based measurements of the immunoassay under the same conditions are in good agreement with the expected and discussed theoretical sensitivities of photothermal and fluorescence measurements.
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