|
Selenium is an essential trace element , has anti-cancer , anti-cancer , protect the heart , prevent cataracts , prevention and treatment of Keshan disease and Kashin-Beck disease , aging and other functions , but also some of heavy metals ( such as mercury , arsenic , silver , etc. ) detoxification , therefore , the development of the selenium-containing drugs and health products become a hot research topic of today 's medicine . Organic selenium compounds have a high rate of absorption , biological activity , low toxicity , environmental pollution has become one of the selenium research direction at home and abroad of organic selenium compounds in the ascendant . On the basis of analysis of the research progress of organic selenium compounds in environmentally friendly synthesis of organic selenium compounds principle , to the end of Shaanxi Qingcha for raw materials, natural products tea polyphenols extract biologically active ingredients by infrared spectroscopy , UV spectroscopy, high performance liquid chromatography and the like means of its structural characterization , established as a raw material to the end of the Shaanxi Qingcha with ethanol extraction agent , crude extracts using a Soxhlet extractor and mixed with polyamide silica gel as adsorbent subjected to column chromatography new Method for the preparation of tea polyphenols , optimum conditions were as follows: 70% ethanol solution as the extractant, the crude extracts from 1.5 hours with a Soxhlet extractor , and then column chromatography conditions for the column chromatography , the column packing size (height : diameter) of 15:1, the adsorbent is a a 1:1 polyamide and silica mixed , the particle size of 100-200 mesh , eluent 70% ethanol solution . Under optimum conditions , the content of the extracted polyphenols from the Shaanxi Qingcha end of 94.5% , 18.9% of the total yield . Starting from the point of view of the green chemistry , tea polyphenols to the Shaanxi Qingcha late extracted natural product as a raw material, from
|