[sing-kuh-neen, -nin, sin-]
- a colorless, crystalline, slightly water-soluble alkaloid, C19H22N2O, a stereoisomer of cinchonidine, obtained from the bark of various species of cinchona and used chiefly as a quinine substitute.
Origin of cinchonine
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Examples from the Web for cinchonine
Red bark contains not only quinine and cinchonine, but also cinchonidine.
When cinchonine is distilled with solid potassium hydrate, it yields pyrrol and bases of both the pyridine and quinoline series.
Cinchonidine, when heated with potassium hydrate, yields quinoline also, and with nitric acid the same products as cinchonine.
The presence of cinchonine may also be positively determined by reference to the behaviour of that alkaloid.
If this be quinidine, it will be dissolved on the addition of proportionately more ether, while cinchonine will remain unaffected.
- an insoluble crystalline alkaloid isolated from cinchona bark, used to treat malaria. Formula: C 19 H 22 N 2 O
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- An alkaloid derived from the bark of various cinchona trees and used as an antimalarial agent.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.