| abstract |
the invention relates to a method for preparing an extract from a preparation of approximately 90% pure 20-hydroxyecdisone comprising the following steps: a) hot dissolution of approximately 90% pure 20-hydroxyecdysone in methanol, filtration and partial concentration, b) addition of 1 to 5 volumes of acetone, c) cooling to a temperature between 0 and 5 ° c while stirring, d) filtration of the precipitate obtained, e) successive rinses with acetone and water, and f) drying . |