Abstract
The pharmacokinetic properties of dihydroquercetin (DHQ) were studied after single and repeated (for 3 days) administration to rats in the form of a starch suspension at a dose of 25 mg/kg. Blood samples were collected using a permanent catheter in the jugular vein in 2, 5, 10, 20, and 30 min and in 1, 2, 4, and 6 h after administration. Before the repeated administration (5 min), blood sample was collected to assess the concentration of DHQ at the zero time point. Quantitative analysis was carried out by HPLC-tandem mass spectrometry. DHQ was very quickly absorbed by the gastrointestinal tract and quickly eliminated from the body. Repeated administration of DHQ did not lead to its accumulation in the body but had an effect on the enzymatic system with a subsequent increase in DHQ exposure (accumulation factor >1 by AUC after repeated administration).
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