Chevreul

Stanis la o Ca n n izza ro (1826-1910) was born in Palermo, Sicily, the son of the chief of police. He studied at the University of Pisa under Rafaelle Piria and also worked in Peris with Michei-Eugene Chevreul. As a youth, he took part in the Sicilian revolution of 1848 and was at one point condemned to death. He was professor of chemistry at the universities of Genoa, Palermo, and Rome and is best known for being the first to clarify the distinction between atoms and molecules. 

Ecole Polytechnique, the Institute of Egypt, and the suburban Arcueil estates of Laplace and Berthollet. Like Gay-Lussac, the chemists Louis N. Vauquelin, Michel Eugene Chevreul, and Louis Jacques Thenard admitted well-recommended students to their private chemical laboratories. By the 1830s, Dumas and Victor Regnault were training students in larger numbers as part of the expected chemical curriculum. 84... 

Creatine was first isolated in 1835 by Chevreul 20 years later Dessaignes showed it to contain a methyl group. Choline was obtained from lecithin in bile by Strecker in 1849 and methionine isolated by Mueller in 1922. That methionine contained a methyl group linked to sulfur was demonstrated by Barger and Coyne in 1928. 

Chevreul named the other major principles he found in animal fat fatty acids , and showed that they occurred in the proportions of three fatty acids to each glycerol. When separated from the glycerol, fatty acids dissolve in alcohol and, by repeated extraction and precipitation with salts, could be purified sufficiently to form crystals. 

Perhaps, depending on these important roles and on their not being homogeneous to other polar food compounds, so that it is easy to separate them, lipids have been thoroughly studied over a number of years. In 1775, Chevreul was able to isolate and characterize cholesterol and a few years later, the presence of glycerol in fats was demonstrated, and this paved the way for us to understand that fats are made (mainly) of triacylglycerols (TAGs). 

M.-E. Chevreul, near the beginning of his surprisingly long career, studied Hatchett s papers and prepared some of the tannin. Hatchett had found that pit coal which contained no resinous substance was dissolved completely by nitric acid and converted into the artificial tannin, whereas any resinous matter remained undissolved. When Chevreul treated pit coal with nitric acid, however, evaporated the solution, and poured it into water, a yellow matter separated, which was much more abundant than what remained in solution, and had no property that rendered it similar to resins. . . yet I do not allow myself, said Chevreul, the least reflection on the labours of that celebrated English chemist, as I am too fully aware that different modes of operating and the different varieties of the bodies examined. . . may produce a variation in the results.. . Chevreul found that the water-soluble substance which precipitated gelatine copiously was a compound of nitric acid and carbonaceous matter. . (22). These artificial tannins... 

Chevreul, M. E., Tanning substances formed by the action of nitric acid on... 

Lemay, Pierre and R. E. Oesper, Michel Eugene Chevreul (1786-1889), ... 

Sarton, George, Hoefer and Chevreul (with an excursus on creative cen-... 

Mendeleev had a keen appreciation of art and literature. He sometimes wrote articles on art, and his study was furnished with pencil sketches of Lavoisier, Newton, Descartes, Galileo, Copernicus, Graham, Mitscherlich, Rose, Chevreul, Faraday, Dumas, and Berthelot drawn by his wife. His favorite author was Jules Verne, and his chief consolation... 

C. J. Brianchon (1822), 400 c.c. J. L. Gay Lussac and M. E. Chevreul are said to have first analyzed the gases and solid residue formed during the combustion of... 

Michei-Eugene Chevreul, article in Philosophical Magazine, 1814... 

One association of the above type—viz., acid-soap formation between a fatty acid and its neutral salt or soap—was postulated a century and a half ago by Chevreul (2). However, this concept was not generally accepted until much later, when studies of such workers as McBain (15, 16, 17), Ekwall (6), Malkin (18), Piper (19), and Levi (13) provided convincing evidence of its correctness. The most recently published data on sodium acid-soaps are those of Ryer (20) who, for the stearate system,... 

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