The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 1996
Filed:
Dec. 16, 1994
Applicant:
Inventor:
Jarmo Toikka, Turku, FI;
Assignee:
Leiras Oy, Turku, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07H / ; A61K / ;
U.S. Cl.
CPC ...
536124 ; 536-41 ; 536 185 ; 536127 ;
Abstract
The invention concerns a process for the preparation of sennosides A and B, wherein rheinanthrone-8-glucoside is oxidized with oxygen or an oxygen source to the sennosides A and B. According to the invention, the oxidation is carried out using active carbon as a catalyst, and, if desired, the obtained sennosides A and B are converted to their calcium salts using methanol precipitation from a calcium ion containing aqueous solution.