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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. SAUCHUK
Институт биоорганической химии НАН Беларуси, Минск
Belarus


O. S. KUPRIENKO
Институт биоорганической химии НАН Беларуси, Минск
Belarus


R. P. LITVINOVSKAYA
Институт биоорганической химии НАН Беларуси, Минск
Belarus


O. V. SVIRIDOV
Институт биоорганической химии НАН Беларуси, Минск
Belarus


V. A. KHRIPACH
Институт биоорганической химии НАН Беларуси, Минск
Belarus


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ISSN 1561-8323 (Print)
ISSN 2524-2431 (Online)