A NEW APPROACH TO IMMUNOCHEMICAL DETERMINATION OF BRASSINOSTEROIDS
Abstract
For the first time, reagents have been synthesized and a technique has been developed for a lanthanide immunofluorometric assay of phytohormonal steroids of 24-epicastasterone and 24-epibrassinolide. A low-molecular-weight conjugate of the brassinosteroid and an Eu3+ complexonate was synthesized by the reaction of 24-epicastasterone-6-(O-carboxymethyl) oxime N-succinimide ester with the europium salt of the diethylenetriaminepentaacetic acid N1-(aminoethyl)amide. A protein conjugate with a high specific fluorescent activity was the product of a simultaneous acylation of primary amino groups in albumin with activated esters of carboxyl derivatives of 24-epicastasterone and an Eu3+ complexonate. Using the high-molecular weight conjugate in an immunochemical system, a linear relationship was obtained between a fluorescent signal of labeled 24-epiсastasterone bound to immobilized antibodies and 24-epibrassinolide concentration in the range of 1 to 300 nM.
About the Authors
A. L. SAUCHUKBelarus
O. S. KUPRIENKO
Belarus
R. P. LITVINOVSKAYA
Belarus
O. V. SVIRIDOV
Belarus
V. A. KHRIPACH
Belarus
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