Scorilas A, Diamandis EP. Polyvinylamine-streptavidin complexes labeled with a europium chelator: a universal detection reagent for solid-phase time resolved fluorometric applications.
Clin Biochem 2000;
33:345-50. [PMID:
11018685 DOI:
10.1016/s0009-9120(00)00082-5]
[Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES
To describe the synthesis and characteristics of a new streptavidin-based universal detection reagent which is multiply labeled with the europium chelate of 4,7-bis(chlorosulfophenyl)-1, 10-phenanthroline-2,9-dicarboxylic-acid (BCPDA).
METHODS AND RESULTS
Polyvinylamine (PVA) was first labeled with biotin(b) and then with BCPDA to create (b)(x)-PVA-(BCPDA)(y). By mixing controlled amounts of this complex with streptavidin (SA) and a fixed amount of Eu(3+), we were able to produce the conjugate (SA)(z)-(b)(x)-PVA(BCPDA)(y)-Eu(3+). This conjugate is reactive, highly fluorescent, and stable for at least 12 months. It was used to develop model solid-phase time-resolved fluoroimmunoassays for biotinylated mouse IgG and prostate specific antigen (PSA). Detection limits achieved were around 1 to 2 ng/L ( approximately 3 x 10(-18) moles/assay).
CONCLUSIONS
A new universal detection reagent was synthesized, which can be used in combination with biotinylated reagents (e.g., antibodies, DNA probes, etc.) for the development of highly sensitive solid-phase time-resolved fluorescence-based assays.
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