Identification and determination of four metabolites of mangiferin in rat urine

Four metabolites of mangiferin were firstly isolated and identified from rat urine. The structures of the four metabolites were determined to be 1,3,7-trihydroxyxanthone (M-1), 1,3,6,7-tetrahydroxyxanthone (M-2), 1,3,6-trihydroxy-7-methoxyxanthone (M-3) and 1,7-dihydroxyxanthone (M-4), respectively. A simple and specific analytical method for determination of the four metabolites in rat urine was developed by high performance liquid chromatography (HPLC). Quercetin was employed as an internal standard. The correlation coefficients of the calibration curves were higher than 0.997, both intra- and inter-day precision of four metabolites were determined and their R.S.D. did not exceed 10%. The accuracy and linear range had been investigated in detail. The cumulative urinary excretions of the four metabolites were measured and the possible metabolic pathway of the metabolites was discussed.

[Investigation on the technology of processing Anemarrhena asphodeloides Bge. without hair by water]

OBJECTIVE

To research the best processing method of Anemarrhena asphodeloides Bge. without hair by water.

METHODS

L9(3)4 orthogonal table were decided with three effect factors: moistening time, temperature, thickness. According to the amount of sarsasapogenin and mangiferin, Orthogonal design was applied to investigate on the technology of processing Anemarrhena asphodeloides Bge. without hair by water.

RESULTS

The moistening time has apparent effects on the sum of sarsasapogenin and mangiferin in Anemarrhena asphodeloides Bge. The best processing method is as follows: Anemarrhena asphodeloides Bge. is moistened for 15 h, then steaming at 60 degrees C after sliced to 3 mm.

[The morphological variation in species of Anemarrhena asphodeloides]

In this paper, morphological studies modified the description in some literatures. The features of Anemarrhena asphodeloides Bunge growing in different districts vary. Carefully observation under Scanning Electron Microscope (SEM) showed that surface characters of leaves at the same developing stage, which were collected from cultivated plants formerly growing in different districts, vary greatly but regularly. It was found that the morphology of pollen grains were similar.