Gibberellin A.sub.4 separation
AssigneeAbbott Laboratories
InventorRichard E. Crutcher
Life of this patent
Estimating the term…
Abstract
Gibberellin A.sub.4 can be separated from the mixture of gibberellin A.sub.4 /A.sub.7 by placing a dilute aqueous mixture thereof at the pH of at least 9 for one day or more and subsequent adjustment of the pH to below 5.5, thereby precipitating substantially pure A.sub.4.
Claims9
The process of separating substantially pure gibberellin A.sub.4 consisting essentially in placing a mixture of gibberellin A.sub.4 and A.sub.7 in an aqueous medium maintained at a pH of 9-11 at a concentration of between 2.5 and 25 g of said mixture per liter at a temperature of 10.degree.-100.degree. C. until the absence of gibberellin A.sub.7 can be determined, subsequently lowering the pH to below 5.5 and collecting the precipitated, substantially pure gibberellin A.sub.4 from the liquid medium.
Dependencies are inferred from the claim text.