| 释义 |
biuret Chem.|ˈbaɪjʊrɛt|
[a. G. biuret (G. Wiedemann 1847, in Jrnl. f. prakt. Chem. XLII. 256), f. bi-2 + urea: see -uret.]
A compound formed by heating urea. Also attrib., as biuret base, biuret test; biuret reaction, the reaction of biuret, proteins, and some other substances containing the {b1}CO · NH{b1} group with an alkaline solution of cupric sulphate, which gives a red or violet coloration.
1869Roscoe Elem. Chem. xxxv. 354 When heated to 120°, urea fuses and begins to decompose, forming substances termed ammeline and biuret. 1877Roscoe & Schorlemmer Chem. I. 652 Biuret, C2O2H5N3. This compound, discovered by Wiedemann, is formed when urea is heated for some time to 150–160°. 1883Jrnl. Chem. Soc. XLIV. 1019 The author..described a substance..obtained from peptones, which gives conspicuously the biuret reaction of those bodies. 1895D. C. Black Urine in Health & Dis. iv. 153 The albumen is separated by filtration and the biuret test applied to the filtrate. 1907J. B. Cohen Org. Chem. 410 Triglycylglycine (biuret base). 1916A. P. Mathews Physiol. Chem. 145 Biuret, a substance..formed by the condensation of two molecules of urea (hence biurea or biuret) with the elimination of ammonia. 1956Nature 4 Feb. 234/2 A number of amino-acids..which appear to constitute a polypeptide moiety yielding a weak biuret reaction. |