| 单词 | biuret base |
| 释义 | > as lemmasbiuret base A compound formed by heating urea. Also attributive, as biuret base, biuret test; biuret reaction n. the reaction of biuret, proteins, and some other substances containing the CO · NH group with an alkaline solution of cupric sulphate, which gives a red or violet coloration. ΘΚΠ the world > matter > chemistry > organic chemistry > substances from animals or humans > urea > [noun] > derivatives uramil1839 dialuramide1857 phenylurea1857 ureide1857 violantin1866 violuric acid1866 biuret1869 the world > matter > chemistry > organic chemistry > chemical processes or reactions > [noun] > miscellaneous other biuret reaction1883 condensation1886 semidine reaction1893 pinacol rearrangement1920 formylation1930 hydrogenolysis1931 polyamidation1946 ene reaction1969 1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxxv. 354 When heated to 120°, urea fuses and begins to decompose, forming substances termed ammeline and biuret. 1874 Jrnl. Chem. Soc. 27 683 Silver Compounds of Biuret. 1877 H. E. Roscoe & C. Schorlemmer Treat. Chem. I. 652 Biuret, C2O2H5N3. This compound, discovered by Wiedemann, is formed when urea is heated for some time to 150–160°. 1883 Jrnl. Chem. Soc. 44 1019 The author..described a substance..obtained from peptones, which gives conspicuously the biuret reaction of those bodies. 1895 D. C. Black Urine in Health & Dis. iv. 153 The albumen is separated by filtration and the biuret test applied to the filtrate. 1906 Bio-Chem. Jrnl. 1 391 Albumoses or peptone (biuret test). 1907 J. B. Cohen Org. Chem. Adv. Students I. 410 Triglycylglycine (biuret base). 1908 W. T. Hall tr. E. Abderhalden Physiol. Chem. 163 The so-called ‘Biuret-reaction’. If we freely add caustic soda or potash to an albumin solution, and then carefully, drop by drop, a dilute solution of copper sulphate, a blue to rose-violet coloration appears. 1916 A. 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. 1956 Nature 4 Feb. 234/2 A number of amino-acids..which appear to constitute a polypeptide moiety yielding a weak biuret reaction. < as lemmas |
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