AIM: A quantitative method was developed for the determination of deoxyschizandrin and schisandrin B in Liganlong Tablet(Fructus Schisandrae Chinensis,Radix Astragali,Radix Angelicae Sinensis,Radix et Rhizoma seucaulis Acanthopanacis Senticosi,etc.) by HPLC. METHODS: The chromatographic conditions included column Symmetry shield~(TM) RP_(18) 5 ?m,3.9 mm?150 mm,mobile phase: methanol-tetrahydrofuran-water(64∶4∶32),flow rate at 1 mL/min,wavelength at 220 nm. RESULTS: The number of theoretical plates is 3555.5.The Deoxyschizandrin liner is 0.068～0.340 ?g (r=0.999 9) and the Schisandrin liner range is 0.06～0.30 ?g (r=0.999 8).The resolutions are 5.09,1.12,respectively. CONCLUSION: The method is sensitive,quick and accurate for the determination of deoxyschizandrin and schisandrin B in Liganlong Tablet.

OBJECTIVETo study the intestinal absorption mechanism of traditional Chinese medicine monomer syringopicroside in rats.

METHODThe in situ rat single-pass intestinal perfusion model was established to detect the concentration of syringopicroside by HPLC. The absorption at different intestine segments in rat and the influence of concentration, pH and P-glycoprotein inhibitors of the drug solution on the absorption of syringopicroside were also observed.

RESULTThe absorption rate constant (K,) of syringopicroside at duodenum, jejunum, ileum, and colon were 0.00255, 0.00630, 0.00900, 0.00799 min- , respectively; Ka from intestine at syringopicroside concentration of 0.090, 0.180, 0.360 g x L(-1) were 0.00370, 0.00708, 0.00694 min(-1), respectively; and Ka at pH of 7.4, 6.8 and 5.0 were 0.00733, 0.00747, 0.00362 min(-1), respectively. P-glycoprotein inhibitor on the intestinal absorption of syringopicroside showed significant influence (P < 0.05).

CONCLUSIONSyringopicroside is well absorbed at the lower small intestine. When the drug concentration is low, the absorption rate constant is low, where as Ka increases at medium and high concentrations; the Ka is low at pH 5.0 and increases at pH 6.8 and pH 7.4. Syringopicroside is proved to be a substrate of P-glycoprotein.

ATP-Binding Cassette, Sub-Family B, Member 1 ; physiology ; Animals ; Glycosides ; pharmacokinetics ; Hydrogen-Ion Concentration ; Intestinal Absorption ; Male ; Rats ; Rats, Sprague-Dawley

Excavating and characterizing the dosage forms characteristics of classic Chinese medicine preparations is the basis for the innovation of modern preparations of Chinese medicine. Through the combing statistics of the National Natural Science Foundation of China (NSFC) on the establishment of traditional Chinese medicine preparations, the research literature on Chinese medicine preparations at home and abroad, and the registration of new Chinese medicines in the past ten years, this paper finds that the research projects of classic Chinese medicines have been greatly reduced. The market share of traditional Chinese medicine classics has shrunk year by year. The modern preparation produced in the "preparation of traditional Chinese medicine by western medicine technology" mode dominates the market. However, because of its "degraded" effect, it is less competitive. Therefore, with the wave of classic dosage forms research promoted by national policies, accelerating the study of classical Chinese medicine preparations will not only promote the development of pharmaceutical discipline of traditional Chinese medicine, enhance the classic medical culture literacy, but also promote the protection and inheritance of classic medicine.