| 释义 |
indican Chem.|ˈɪndɪkən|
[Named by Schunck 1855, from indic-um + -an I. 2: see alloxan.]
The natural glucoside (C26H31NO17) formed in plants which yield indigo, by the decomposition of which indigo-blue is produced; it forms a light-brown syrup, of bitter taste, and slightly acid reaction. b. indican of urine: an incorrect name for the potassium salt of indoxyl sulphuric acid, a normal constituent of the urine of animals. Also called uroxanthin.
1859T. A. Carter in Edin. Med. Jrnl. Aug. 119 (title) On Indican in the Blood and Urine. Ibid. 121 On treating indican with the mineral acid, he [Schunck] found that it was resolved into blue indigo, ‘indirubine’, ‘indifuscine’, and a peculiar kind of sugar. 1866Odling Anim. Chem. 122 Human urine..contains habitually an indigo-yielding substance known as indican, which is probably a glucoside of white or hydrogenised indigo. 1874Schorlemmer Organ. Chem. 462. 1878 Foster Phys. (1884) 768 The indican obtained from urine is not a glucoside. 1889Morley & Muir Dict. Chem. II. 759/2 Indican by heating with dilute acids is resolved into indigo and indiglucin (a sugar). Simultaneously are formed indirubin C16H10N2O2, indiretin C18H17NO5 (dark-brown resin, sol. alcohol), indifulvin (reddish-yellow resin, insol. alk.), indihumin C10H9NO3 (brown powder, insol. water and alcohol, sol. alk.), indifuscin C24H20N2O9 (analogous to indihumin).
Hence indicanine |ˈɪndɪkənaɪn|, Chem.: see quot.; indicaˈnuria, Path. presence of indican in excess in the urine.
1865–72Watts Dict. Chem. III. 248 Indicanin, C20H23NO12..is produced, together with indiglucin, by the action of aqueous alkalis..on indican. Indicanin is a yellow or brown bitter syrup, soluble in water, alcohol, and ether. 1889Morley & Muir II. 759/2 Indicanine. 1897Allbutt's Syst. Med. IV. 200 We occasionally meet with indicanuria. |
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