Objective To study the fingerprint determination method of Pogostemon cablin by HPLC.Methods A RP-HPLC method was established with the mixed solution of methnol and 0.1 % acetic acid aqueous solution as mobile phase(gradient elution),flow rate at 1.0 mL/min,detection wavelength at 254 nm,analytic time being 50 min and column temperature at 25 ℃.Results The results of comparative analysis of 10 batches samples showed that 15 common peaks were shared by Pogostemon cablin.The common peaks were classified to two regions and the second was the main characteristic region which had an amount of characteristic peaks.All samples had the similar fingerprint features.Conclusion The method is accurate,repetitive and can be applied for the identification and quality control of Pogostemon cablin.

[Objective] To compare the difference of fingerprints of Pogostemon cablin (Blanco) Benth. from different places of origin. [Methods] The chemical components of Pogostemon cablin (Blanco) Benth. from 6 places of origin were detected by thin-layer chromatography. [ Results ] The thin-layer chromatogram of volatile components of Pogostemon cablin (Blanco) Benth. from different places of origin was similar. The contents of methanol-extract and petroleum-ether-extract from Pogostemon cablin (Blanco) Benth. planted in Gaoyao, Guangdong differed greatly from those in other places of origin, which can be used to identify the herb of Pogostemon cablin ( Blanco) Benth. from Gaoyao, Guangdong. [Conclusion] Thin-layer chromatographic fingerprints can be used as the parameter to differentiate Pogostemon cablin (Blanco) Benth. from different places of origin.

AIM: To establish the method for determing effective components of notoginsenoside in Compound Danshen Tablets(Radix et Rhizoma Salviae miltiorrhizae,Radix et Rhizoma Notoginseng,Borneolum Syntheticum) by RP-HPLC. METHODS: The contents of notoginsenoside R_1,ginsenoside Rg_1,ginsenoside Re and ginsenoside Rb_1 were simultaneously determined by an HPLC system with Kromasil C_(18)(5 ?m,250 mm?4.60 mm),the mobile phase was CH_3CN-0.05%H_3PO_4(CH_3CN 0-12 min:22%;12-20 min:22%-28%;20-60 min:28%-43%).The flow rate was 1 mL/min.The detection wavelength was set at 203 nm. RESULTS: The linear ranges of notoginsenoside R_1,ginsenoside Rg_1,ginsenoside Re and ginsenoside Rb_1 were 0.326-3.260 ?g(r=(0.999 7),) 0.890-8.900 ?g(r=0.999 8),0.144-1.440 ?g(r=0.999 6),0.940-9.400 ?g(r=0.999 8),respectively.Their average recoveries(n=6) were 99.08%,98.36%,97.54% and 96.07%,corresponding RSD were 4.41%,1.64%,2.77% and 1.12%,respectgively. CONCLUSION: The results indicate that the HPLC method is simple,accurate,highly selective and reproducible,thus it could be used as quality control in the preparation of Compound Danshen Tablets.

OBJECTIVETo establish a method to evaluate the in vitro release of Zhike Pingchuan sustained-release tablets.

METHODThe ephedrine, pseudoephedrine, scopolamine were chosen as marker components components, and the chromatographic conditions were chosen according to the separation of baseline and theoretical plate number for determining the marker in vitro release of Zhike Pingchuan sustained-release tablets; through the dissolution curves of the three active components, the release behavior was judged as well-balanced release or not.

RESULTCompared with conventional tablets, the Zhike Pingchuan sustained-release tablets had a well-balanced behavior in 10 h.

CONCLUSIONThe maker components of Zhike Pingchuan sustained-release tablets and two chromatographic conditions, which were used to determine the dissolution of the sustained-release tablets, could be chosen as evaluation methods for the in vitro release of Zhike Pingchuan sustained-release tablets.

Administration, Oral ; Chemistry, Pharmaceutical ; Chromatography, High Pressure Liquid ; Delayed-Action Preparations ; chemistry ; Drug Carriers ; Drug Compounding ; Drug Stability ; Ephedrine ; chemistry ; Hardness ; Hydrogen-Ion Concentration ; Kinetics ; Pharmaceutical Preparations ; chemistry ; Solubility ; Spectrophotometry, Ultraviolet ; Tablets ; chemistry