A Text-Book of Materia Medica, Including Laboratory Exercises in the Histologic And Chemic Examinations of Drugs for Pharmaceutic And Medical Schools And for Home Study
The book A Text-Book of Materia Medica, Including Laboratory Exercises in the Histologic And Chemic Examinations of Drugs for Pharmaceutic And Medical Schools And for Home Study was written by author Hatcher, Robert Anthony, 1868-1944 Here you can read free online of A Text-Book of Materia Medica, Including Laboratory Exercises in the Histologic And Chemic Examinations of Drugs for Pharmaceutic And Medical Schools And for Home Study book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text-Book of Materia Medica, Including Laboratory Exercises in the Histologic And Chemic Examinations of Drugs for Pharmaceutic And Medical Schools And for Home Study a good or bad book?
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291 Clucosids are characterized by yielding glucose and some other substance upon decomposition by dilute miueral acids or ferments. The term embraces a great number of substances differing widely in other respects. It includes the tannins, which have many properties in common ; the saponins ; cathartic acid from senna ; and amygdalin from bitter almond, which, by its decomposition, yields hydro- cyanic acid. Some glucosids reduce Fehling's solution without inver- sion, in which case the fermen...tation test (see Ferments, Ex- periment 5) is necessary for their determination. Most glucosids are insoluble in ether and benzol, and are precipi- tated by tannin, but not by other alkaloidal reagents. The ferments are usually specific for a limited number. Some glucosids are resinous, but most of them are crystalline. Two glucosids, glycyrrhizin and salicin, are official. The following glucosids, among the very great number existing, may be mentioned : Amygdalin in bitter almond ; quercitrin in oak and other barks ; convolvulin and jalapin in jalap ; digitalin and digitoxin in digitalis, sinigrin in black and sinalbin in white mustard ; picrocrocin in saffron ; conif- erin in various species of Coniferse ; scillain and scillin in squill ; and numerous saponins from different sources.
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