代谢
口服给药的迷迭香酸(7)在大鼠尿液中含有七种代谢物,通过光谱和化学数据鉴定为:反式-咖啡酸4-O-硫酸酯(1)、反式-m-香豆酸3-O-硫酸酯(2)、反式-阿魏酸4-O-硫酸酯(3)、反式-咖啡酸(4)、m-羟基苯丙酸(5)、反式-m-香豆酸(6)以及未改变的迷迭香酸(7)。口服给药迷迭香酸48小时后,尿液中1-7的总累积排泄量约为给药剂量的31.8%。另一方面,在胆汁中并未发现归因于迷迭香酸的代谢物。因此,可以得出结论,口服给药的迷迭香酸主要通过尿液排泄,而不是胆汁,代谢过程中包括酯键的断裂、选择性的对位脱羟基作用、甲基化和硫酸结合。代谢物2、3、5和6也出现在血浆中。
The urine of rats administered rosmarinic acid (7) orally contained seven metabolites, which were identified as trans-caffeic acid 4-O-sulfate (1), trans-m-coumaric acid 3-O-sulfate (2), trans-ferulic acid 4-O-sulfate (3), trans-caffeic acid (4), m-hydroxyphenylpropionic acid (5), trans-m-coumaric acid (6), and unchanged rosmarinic acid (7) by spectroscopic and chemical data. The total cumulative amount of 1-7 excreted in the urine 48 h after the oral administration of rosmarinic acid was approximately 31.8% of the dose administered. On the other hand, the metabolites attributed to rosmarinic acid could not be found in the bile. Orally administered rosmarinic acid may thus be concluded to be excreted in the urine rather than in the bile, with cleavage of ester bonds, selective para-dehydroxylation, methylation, and sulfate-conjugation. Metabolites 2, 3, 5, and 6 were also detected in the plasma.
来源:Hazardous Substances Data Bank (HSDB)