Chemical examination of the root of ipomoea orizabensis / by Frederick B. Power and Harold Rogerson.

  • Frederick Belding Power
Date:
[1912?]
Catalogue details

Licence: In copyright

Credit: Chemical examination of the root of ipomoea orizabensis / by Frederick B. Power and Harold Rogerson. Source: Wellcome Collection.

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    of acids, consisting apparently of optically active valeric and liexoic, acids, together with sehacic and ?£-nonanedicarboxylic acids. III. Chloroform Extract of the Resin.—This was relatively small in amount, and consisted of a dark resinous product. IV. Ethyl Acetate Extract of the Resin.—The optical rotatory power of this extract was [a]D — 28'01°. After hydrolysis with barium hydroxide it yielded products from which the same substances were obtained as from the ethereal extract of the resin, with the exception of the small amount of ipuranol. V. Alcohol Extract of the Resin.—This was a black, amorphous product of a glucosidic nature, but which yielded nothing definite on hydrolysis. From the results of the present investigation it will be apparent that the resin of Ijpomoea orizabensis is an exceedingly complex mixture, the constituents of which are, for the most part, amorphous, and not entirely glucosidic. It follows, therefore, that the so-called “jalapin,” which includes all the constituents of the resin that are soluble in ether, cannot be represented by any of the various formulas hitherto assigned to it. It may also be noted that the portion of this resin which is soluble in ether is not identical with the ether-soluble portion of jalap resin, as has previously been affirmed. The Wellcome Chemical Research Laboratories, London, E.C. R. CLAY AND SONS, LTD., BRUNSWICK ST., STAMFORD ST., S.E., AND BUNGAY, SUFFOLK.