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This paper reports the quantitative analysis of glaucocalyxin A in the leaves of Plectranthus japonicus var. glaucocalyx by HPLC. The chromatographic conditions were as follows: column: Shim-pack CLC-ODS; mobile phase: methanol-water (70:30). The average content of glaucocalyxin A in the leaves is 1.30%.
An HPLC method for the determination of hyperin in Sanguisorba officinalis L. was investigated. 0.5 g of dried powdered crude drug was weighed accurately in a 50 mL volumetric flask added with 40 mL methanol, supersonicated for 30 min and then made up to volume with methanol. The sample solution was separated on a Shim-pack ODS column(6.0 mm i.d. x 150 mm,… (More)
OBJECTIVE To develop a method for the determination of columbianetin, columbianetin acetate and osthol in Angelica pubescens f. biserrata METHOD HPLC method, ODS column (6.0 mm x 150 mm) with a mobile phase of methanol-acetonitrile-0.025 mol.L-1 phosphoric acid (32:20:48), and wave length detection at 320 nm. RESULT AND CONCLUSION The method can be used… (More)
The quantitative changes of flavonoids in Epimedium koreanum in different collecting periods were determined by HPLC and UV spectrophotometry. The result shows that the highest content of flavonoids is found in the flowering period (May).
The contents of myristicin and safrol in the volatile oil of nutmeg and its processed products were determined by HPLC. This method is fast, accurate and gives good resolution. It has also been confirmed that myristicin tends to decrease in varying degrees after the nutmeg has been processed.
A HPLC method for the determination of chrysophanol in Semen Cassiae was investigated. The result showed that this method was simple, specific and accurate. The recovery was 99.0% and relative standard deviation was 1.8%. The method is useful for the quality control of this medicinal meaterial.
College of Microelectronics, Tianjin University, Tianjin, China, Tianjin International Joint Research Center for Neural Engineering, Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China, Department of Biomedical Engineering, College of Precision Instruments and Optoelectronics Engineering, Tianjin University,… (More)
A HPLC method for the determination of hyperin in Epimedium koreanum was investigated. The result shows that this method is simple, specific and accurate. The recovery was 97.4% and relative standard deviation was 1.2%. With good reproducibility and wide response linearity, the method can be used for the quality control of this herbal medicine.
OBJECTIVE To establish a HPLC method for the determination of gallic acid in garden burnet. METHOD The sample was extracted with methanol under ultrasonic management for 25 min. Chromatographic conditions: Shimadzu LC-6A with SPD-6AV detector at 270 nm and auto injector SIL-6A, methanol-0.025 mol/L phosphoric acid(15:85) as the mobile phase. Shin-pack… (More)
An HPLC method for determination of icariin in epimedium koreanum nakai was investigated. The results showed that this method was simple, specific and accurate. The recovery was 97.6% and relative standard deviation was 1.2%. About 0.5 g of dried powdered crude drug was weighed accurately, placed in 25 mL of the mobile phase and refluxed on a water-bath for… (More)