The content of plant hormones (brassinosteroids) in oil samples from a number of oilfields in Belarus is determined using an enzyme immunoassay method. Brassinosteroids of the brassinolide, 24-epibrassinolide, and 28-homobrassinolide types have been found in fossil material for the first time. The brassinosteroid content of oil varies from 0.87 to 8.82 ng/g, which is comparable to their content in plant objects.

中文翻译：

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植物类固醇激素作为白俄罗斯泥盆纪油的独特成分

白俄罗斯多个油田的油样中植物激素（油菜素类固醇）的含量是使用酶免疫分析法测定的。油菜素内酯、24-表油菜素内酯和28-高油菜素内酯类型的油菜素内酯首次在化石材料中被发现。油中油菜素类固醇的含量从 0.87 到 8.82 ng/g 不等，这与它们在植物物体中的含量相当。