The concentration of abscisic acid in plants is regulated not only by biosynthesis, but also by metabolism. Abscisic acid is metabolized to phaseic acid via 8′-hydroxyabscisic acid, and phaseic acid is then converted to dihydrophaseic acid and its epimer. A quantitative analysis of these metabolites is important as well as that of abscisic acid to understand changes in the concentration of abscisic acid in plants. However, no internal standards of the metabolites suitable for quantitative analysis have been reported. We prepared 7′-deuterium-labeled phaseic acid with a deuterium content of 86%, using the equilibrium reaction between phaseic acid and 8′-hydroxyabscisic acid. 7′-Deuterium-labeled dihydrophaseic acids were obtained by reducing 7′-deuterium-labeled phaseic acid. The levels of the metabolites in plant organs were determined by using the deuterated metabolites as internal standards.
植物体内
脱落酸的浓度不仅受
生物合成的调节,也受新陈代谢的调节。
脱落酸通过 8′-羟基
脱落酸代谢为相思酸,相思酸再转化为双氢相思酸及其表聚物。对这些代谢物以及
脱落酸进行定量分析对于了解植物体内
脱落酸浓度的变化非常重要。然而,目前还没有适合定量分析的代谢物内标物的报道。我们利用
脱落酸与 8′-羟基
脱落酸的平衡反应制备了 7′-
氘标记的
脱落酸,其
氘含量为 86%。通过还原 7′-
氘标记的相酸,可获得 7′-
氘标记的二氢相酸。以氚标记的代谢物为内标,测定植物器官中代谢物的含量。