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Coumarins are the major active compounds of APR extract including columbianetin, columbianetin acetate, osthole, and columbianadin. The<jats:italic> in vivo<\/jats:italic> behavior of the four major coumarins of APR has not been systematically reported. A feasible and reliable ultra-performance liquid chromatography (UPLC) method was established and validated for the quantification of the above four coumarins in rat various tissues (including heart, liver, spleen, lung, kidney, uterus, ovary, and muscle) after oral administration of APR extract. The separation was implemented on a Waters ACQUITY BEH C18 column (4.6 mm \u00d7 100 mm, 1.7 <jats:italic>\u03bc<\/jats:italic>m) with gradient mobile phase comprising acetonitrile-water (with 1mM formic acid) at a flow rate of 0.3 mL\/min. The tissue homogenate samples were prepared by liquid-liquid extraction with ethyl acetate. The calibration curves were linear in the range of 1.6-20000 ng\/mL for four coumarins with the lower limit of quantitation of 1.6 ng\/mL in rat tissues. The intraday and interday precisions and recoveries were all within 80-100% with the relative standard deviations (RSDs) which were all less than 10.9%. The method was successfully applied to the tissue distribution research after oral administration of 6.0 g\/kg APR extract to rat. The results revealed that the tissues distributions of four coumarins were in the liver, followed by the ovary, uterus, kidney, lung, heart, spleen, and muscle.<\/jats:p>","DOI":"10.1155\/2019\/2365697","type":"journal-article","created":{"date-parts":[[2019,2,7]],"date-time":"2019-02-07T18:34:50Z","timestamp":1549564490000},"page":"1-8","source":"Crossref","is-referenced-by-count":10,"title":["The Tissue Distribution of Four Major Coumarins after Oral Administration of Angelicae Pubescentis Radix Extract to Rats Using Ultra-High-Performance Liquid Chromatography"],"prefix":"10.1155","volume":"2019","author":[{"given":"Yuanyuan","family":"Ge","sequence":"first","affiliation":[{"name":"Tianjin Key Laboratory of Phytochemistry and Pharmaceutical Analysis, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, China"},{"name":"Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, 300193, 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