Abstract
Iridin, one of the main bioactive components isolated from Belamcanda chinensis (L.) DC, exerts various pharmacological activities, such as anti-inflammation, antioxidant, and antitumor. However, the metabolism and pharmacokinetics of iridin are still unknown. After 100 mg/kg administration of iridin orally, the plasma, urine, and fecal bio-samples from Sprague–Dawley (SD) rats were collected and detected by ultrahigh-performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS). The pharmacokinetics of the major metabolite irigenin (aglycon of iridin) and a total of thirteen metabolites of iridin were identified, including five metabolites in plasma, ten metabolites in urine, and six metabolites in feces. The most principal metabolic pathway of iridin was glucuronidation after demethylation and was mediated by UDP-glucuronosyltransferases (UGTs) 1A7, 1A8, 1A9 and 1A10. This study highlights the first-time investigation of the metabolism of iridin in vivo, and the pharmacokinetics of irigenin (the major metabolite of iridin) in rats. These results provide robust evidence for further research and clinical application of iridin.
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