| 释义 |
xanthin Chem.|ˈzænθɪn|
Also xanthine, (zanthin).
[ad. F. xanthine or G. xanthin, f. Gr. ξανθός yellow: see -in1.]
1. a. A yellow colouring-matter obtained from madder.
1838T. Thomson Chem. Org. Bodies 387 Madder, according to Kuhlmann, contains two colouring matters, one, which is yellow, is soluble in cold water. Kuhlmann, who first obtained it, has given it the name of xanthin. 1839Ure Dict. Arts, etc. 1329 Xanthine, is the name given by Kuhlmann to the yellow dyeing-matter contained in madder. c1865J. Wylde in Circ. Sc. I. 421/1 Other principles may be extracted from madder, such as purpurine, alizarine, xanthine.
b. That part of the yellow colouring-matter of flowers which is insoluble in water: cf. xanthein.
1857Miller Elem. Chem., Org. 546. 1868 Watts Dict. Chem. V. 1050.
2. (See quot.)
1868Watts Dict. Chem. V. 1050 Xanthin,..applied..3. By Couerbe to a gaseous product of the decomposition of xanthates, to which he assigned the formula C2H2S2O2.
3. attrib. xanthin-spar, yellow lead-spar or wulfenite.
1868Watts Dict. Chem. V. 1052. |