Comparative Analysis of Pharmacokinetics and Metabolites of Three Main Terpenoids before and after Compatibility of Frankincense and Myrrh in Rats by UHPLC-MS

Background: 3-acetyl-11-keto-beta-boswellic acid (AKBA) and 11-keto-boswellic acid (KBA) are the main active components of frankincense as pentacyclic triterpenoids, which are designated by the European Pharmacopoeia 8.0 as the quality standard for the evaluation of Indian frankincense, 2-methoxy-8,12-epoxygermacra- 1(10),7,11-trien-6-one (MCS134) is a non-volatile sesquiterpene compound in myrrh. Objective: In this paper, the absorption pharmacokinetics and metabolites of AKBA, KBA and MCS134 after frankincense, myrrh and their compatibility were analyzed, elaborated their absorption and metabolism mechanism and provided the ideas for the research on the bioactive components of frankincense and myrrh compatibility in vivo. Methods: The area under the blood concentration time curve (AUC), half-life (t1/2) and drug clearance (CL) of AKBA, KBA and MCS134 in rats were analyzed by LC-TQ / MS. The metabolites of AKBA, KBA and MCS134 in rats were analyzed by ultra-high pressure liquid chromatography with a linear ion trap-high resolution Orbitrap mass spectrometry system (UHPLC-LTQ-Orbitrap-MS). Results: The results showed that AKBA, KBA and MCS134 reached the maximum plasma concentration at about 2 h, 2 h and 15 min, respectively. AUC0-tand t1/2of the three components increased in varying degrees after compatibility, and the clearance/ bioavailability (CL/F) decreased. AKBA, KBA and MCS134 were metabolized in phase I and phase II in rats, and there represented differences before and after compatibility. Conclusion: After the compatibility of frankincense and myrrh, the absorption of effective components was improved to some extent, and there were some differences in the metabolites in rats. The results provide ideas for elucidating the in vivoeffect mechanism of frankincense and myrrh.