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Food- and gender-dependent pharmacokinetics of paeoniflorin after oral administration with Samul-tang in rats

Hwang, Youn-Hwan, Kim, Taesoo, Cho, Won-Kyung, Jang, Doorye, Ha, Jung-Ho, Ma, Jin Yeul
Journal of ethnopharmacology 2012 v.142 no.1 pp. 161-167
Angelica gigas, Cnidium, Paeonia lactiflora, Rehmannia glutinosa, absorption, analysis of variance, bioavailability, food intake, gender differences, high performance liquid chromatography, neuroprotective effect, oral administration, pharmacokinetics, rats, research methods, traditional medicine
ETHNOPHARMACOLOGICAL RELEVANCE: Samul-tang (Si-Wu-tang in Chinese, Shimotsu-to in Japanese), widely used in eastern Asia, is composed of Angelica gigas (Angelicae Gigantis Radix), Cnidium officinale (Cnidii Rhizoma), Paeonia lactiflora (Paeonia Radix) and Rehmannia glutinosa (Rehmanniae Radix Preparata). Paeoniflorin, one of active components in Samul-tang has anti-platelet, anti-inflammation, anti-cancer and neuroprotective properties. However, there is no information about the effects of gender and food intake on the pharmacokinetics of paeoniflorin till now. AIM OF THE STUDY: This study was conducted to investigate whether food and gender could influence pharmacokinetic profiles of paeoniflorin after oral administration of Samul-tang. MATERIALS AND METHODS: Male and female rats were administered with a single oral dose of Samul-tang equivalent to 80mg/kg of paeoniflorin. Plasma concentrations of paeoniflorin were measured by high-performance liquid chromatography. The statistical differences of each group were evaluated using the analysis of variance (ANOVA) or Student t-test. RESULTS: The pharmacokinetic parameters of paeoniflorin were not significant different by gender difference. However, the maximum plasma concentration (Cₘₐₓ, 0.47±0.29μg/mL versus 1.10±0.35μg/mL), area under the concentration-time curve (AUC₀→∞, 1.41±0.89h·μg/mL versus 3.12±1.61h·μg/mL) and relative bioavailability (Fᵣₑₗ=2.21) of fed rats were significantly increased in comparison with those of fasted rats (P<0.05). CONCLUSION: Taken together, food intake can affect both the rate and extent of absorption of paeoniflorin when Samul-tang was administered orally. Furthermore, this study demonstrates a readily preparative HPLC method in the research of traditional herbal medicine.