Fraxinus mandshurica extract for treating rheumatoid arthritis
A rheumatoid, extractive technology, applied in the fields of anti-inflammatory agents, food science, drug combination, etc., can solve the problem of less research on pharmacological activity, and achieve the effects of low toxicity, simple process and abundant resources
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[0022] Preparation of Fraxinus Fraxinus Extract
[0023] Weigh 10kg of fresh leaves of Mandshurica mandshurica, mince them, add 90% ethanol, heat and reflux at 80°C for 3 times, each time for 1.5 hours, combine the extracts, recover ethanol under reduced pressure, and obtain extract A. Disperse the extract with 2L distilled water (30°C), extract 3 times with an equal volume of petroleum ether to remove low-polar compounds such as oil and chlorophyll, heat to remove the remaining petroleum ether, and put it on a Diaion HP-20 macroporous resin column , first eluted with distilled water until there was no sugar reaction, then eluted with 95% ethanol, and recovered ethanol under reduced pressure to obtain extract B. The extract B is separated with 200-300 mesh silica gel, firstly use ethyl acetate-methanol-water (volume ratio 8:2:0.5) to remove phenylethanol glycosides, and then use chloroform-methanol-water (volume ratio 8:2: 1 lower layer) to elute the coumarin glycosides, evap...
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