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Pharmacokinetic study of rhein from the ultra-micro and fine powder of Shanzha Xiaozhi Capsules in rats |
LIANG Xiuqing1 SHEN Xiao2 LI Zihong1 LI Huaiguo1 LIU Dongwen1 WANG Lisheng2 |
1.Preparation Center, Foshan Hospital of TCM, Guangdong Province, Foshan 528000, China;
2.College of Traditional Chinese Medicine, Guangzhou University of Chinese Medicine, Guangdong Province, Guangzhou 510006, China |
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Abstract Objective To compare the differences of pharmacokinetic characteristics of rhein after rats received ultra-micro and fine powder of Shanzha Xiaozhi Capsules by gavage. Methods The experimental rats were given suspensions of the ultra-micro and fine powder of Shanzha Xiaozhi Capsules. The plasma concentration of rhein in rats was measured by high performance liquid chromatography. Uranus C18 (250 mm× 4.6 mm, 5 μm) was used as the analytical column. The mobile phase was methanol-water-0.1% phosphoric acid (85∶15), the wavelength of detection was set at 254 nm, and the flow rate was 1.0 mL/min. Serum concentration-time data was processed by pharmacokinetics software PKSolver 2.0. Results The linear range of rhein was from 0.16 to 40.00 μg/mL. The concentration-time curves of rhein in rats fitted well into two compartment model. The main pharmacokinetic parameters of the AUC of rhein from the ultra-micro and fine powder of Shanzha Xiaozhi Capsules were (4.08±4.96) μg/(mL·h) and (0.74±0.06) μg/(mL·h) (P < 0.05), the maximum plasma concentration of rhein from the ultra-micro and fine powder of Shanzha Xiaozhi Capsules were (0.79±0.15) μg/mL and (0.17±0.02) μg/mL (P < 0.05). Conclusion The ultra-micro porphyrization can make the absorption of rhein more complete in rats and improve bioavailability.
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