Research of seed quality grading of Glycyrrhiza uralensis / 中国中药杂志

<p><b>OBJECTIVE</b>To formulate the seed quality grading standard of Glycyrrhiza uralensis.</p><p><b>METHOD</b>Thousand-grain weight, seed moisture, germination rate, purity of G. uralensis seed samples from 24 regions were tested. Through statistical analysis, the key indicator and the reference indicators for seed quality grading were defined.</p><p><b>RESULT</b>Germination percentage was the primary indicator of seed quality grading, thousand-grain weight, cleanliness and moisture content were important reference indicators.</p><p><b>CONCLUSION</b>The seed quality of each grade should reach the following requirements: for first grade seeds, germination percentage > or = 85% , purity > or = 92%, thousand-grain weight > or = 13 g, seed moisture < or = 11%; for second grade seeds, germination percentage 75%-85%, purity 83%-92%, thousand-grain weight 11-13 g, seed moisture < or = 11%; for third grade seeds, germination percentage 65%-75%, purity 74%-83%, thousand-grain weight 9-11 g, seed moisture < or = 11%.</p>

Survey of study on the extraction, purification and determination methods of glycyrrhizic acid in Licorice / 中国中药杂志

Extraction, purification and determination methods of glycyrrhizic acid in Licorice are surveyed in this paper. The extracting efficiency of dilute ethanol solvent for glycyrrhizic acid is higher than water extraction, and ammonia appended to ethanol solution can increase the effect of extraction. Ultrasound method, microwave-assisted method and supercritical CO2 fluid extraction are more effective than the conventional techniques, due to the short extraction time, low consumption of solution and energy. The modem analytical methods such as TLCs, HPLC and CE can determine the content of glycyrrhizic acid rapidly and exactly.