[Study on chemical constituents isolated from Juncus effuses].

Objective: To study the constituents isolated from Juncus effuses Linn..

Methods: The compounds were isolated through chromatographic approaches, such as Silica gel.

[Quality comparison between two cultivated Chinese yam-Kunming yam and Tiegun yam].

Objective: To compare the quality of cultivated Chinese yam (Dioscorea polystachya Turcz.) from Yunnan (Kunming yam) and Henan (Tiegum yam) by determining the content of dry substance in fresh sample and the contents of water extracts, ethanol extracts, starch, protein, crude-fat and polysaccharide in dry sample.

Method: The above-mentioned indexes were determined by methods of air desiccation, cold-immersing, hot-immersing, iodine-blue coloration, half Micro-Kjeldahl, Soxhlet extraction and spectrophotometric method respectively.