Allen's commercial organic analysis Volume 9; a treatise on the properties, modes of assaying, and proximate analytical examination of the various ... medicine, etc., with concise methods for

 
9781231228722: Allen's commercial organic analysis Volume 9; a treatise on the properties, modes of assaying, and proximate analytical examination of the various ... medicine, etc., with concise methods for
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...ERRATUM IN VOL. VI. 'J. Ind. Eng. Chem., 1909, i, 698. 'J. GiisbcL, 1911. 55, 90s. Zeitschr. Nahr. Genussm., 1911, 21, 655. 'Biochcm. Zeil., 1913, 56, 8a. THE VEGETABLE ALKALOIDS. By THOMAS A. HENRY, D. Sc. Since the date of the previous article a great deal of work on alkaloids has been published but it is mainly concerned either with.the determination of the constitution of well-known alkaloids, or with the isolation and characterisation of new alkaloids. Comparatively few new facts which affect alkaloids as a class have been recorded. Formation and Function of Alkaloids in Plants.--In the original article it was pointed out that two views are held as to the mode of formation of alkaloids in plants. Some authorities believe that they are products of direct synthesis, whilst others regard them as formed, directly or indirectly by the decomposition of proteins first formed. It seems to be clearly established that where alkaloids do not occur in the seeds of plants, which normally contain them, they are produced almost as soon as the seeds germinate: thus Torquati1 found that ungerminated barley is free from hordenine but that the base is formed immediately on germination and steadily increases in amount until the fourth day when it reaches a maximum and then gradually diminishes. Similarly Kerbosch2 found that although the seed of the opium-poppy contains only a trace of narcotine and amorphous alkaloids, the amount of narcotine increases on germination and the other characteristic opium alkaloids appear in the order, codeine, morphine, papaverine, narceine, and thebaine. This increase occurs even when the seeds are germinated in a nitrogen-free atmosphere, whence it appears that the narcotine and other alkaloids are formed at the expense of protein, de Pla...

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