| Leopold Gmelin - 1864 - 594 pages
...decolorised bv animal charcoal, and filtered ; and the greater part of the alcohol is distilled off. The residue mixed with water is heated in a water-bath,...driven off, after which the resin is treated for a Ion? time (even for 4 weeks) in a water-bath, with frequently renewed hi>t water, and at last dried... | |
| Leopold Gmelin - 1864 - 586 pages
...neutral acetate of lead, and the excess of lead is removed from the filtrate by hydroeulphuric acid. The greater part of the alcohol is distilled off, and the residue is evaporated to dryness and treated with acetic acid, which dissolves the bitter principle, and leaves... | |
| Leopold Gmelin - 1864 - 598 pages
...neutral acetate of lead, and the excess of lead is removed from the filtrate by hydrosulphuric acid. The greater part of the alcohol is distilled off, and the residue is evaporated to dryness and treated with acetic acid, which dissolves the bitter principle, and leaves... | |
| Henry Watts - 1865 - 1110 pages
...(boiling, according to Keller) ; the tincture is diluted with water till it becomes turbid, decolorised by animal charcoal, and filtered ; the greater part...in ether and recovered by evaporation. (Spirgatis.) The jalapin (obtained according to a or b) still contains a small quantity of a volatile acid (valerianic... | |
| 1870 - 304 pages
...boiling alcohol, 85°. Upon cooling, the alcoholic solution deposits a considerable quantity of nitre ; the greater part of the alcohol is distilled off and the residue evaporated at 75° C. to a syrupy consistence. Upon repose Chenopodine separates in grains. An additional... | |
| 1871 - 514 pages
...precipitated with neutral acetate of lead ; the filtrate is freed from excess of lead by hydrosulphuric acid ; the greater part of the alcohol is distilled off, and the residue is poured into water, whereupon kinoviu is precipitated and may be purified as in 1 (Hlasiwetz). 3.... | |
| Frederick Crace Calvert - 1876 - 572 pages
...water, the extract concentrated by evaporation, and then treated with hot alcohol; after filtration the greater part of the alcohol is distilled off, and the residue left to itself in a cool place ; yellow crystals of berberine are then deposited, and may be purified... | |
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