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. 1900 Excerpt: ...portion of the percolate being reserved and the remainder concentrated and added to the reserved portion together with about 10 per cent, of alcohol. Operating in this way upon a bark known to contain 6.5 per cent, of alkaloid, Mr. Wobbe obtained a product containing only 4.5 per cent, of alkaloid; but if, instead of ...
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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. 1900 Excerpt: ...portion of the percolate being reserved and the remainder concentrated and added to the reserved portion together with about 10 per cent, of alcohol. Operating in this way upon a bark known to contain 6.5 per cent, of alkaloid, Mr. Wobbe obtained a product containing only 4.5 per cent, of alkaloid; but if, instead of water, alcohol in certain proportion was used, a product was obtained which contained the alkaloid in practically the same proportion as in the original bark. He employs the cinchona in moderately fine powder, moistens this with 50 per cent, of its weight of a mixture of 100 parts of glycerin, 100 parts of alcohol, 30 parts of 25 per cent, hydrochloric acid, and 70 parts of water, macerates for 24 hours, and then percolates with alcohol of 69 to 70 volume per cent, to complete exhaustion. The first 70 parts from 100 parts of bark are set aside, the remainder of the percolate, amounting to nearly 12 times the weight of the bark, is concentrated to 30 parts and added to the reserve portion to complete the fluid extract. The author has also found the official process for the Assay of biuid Extract of Cinchona to yield unsatisfactory results, and suggests the following modification: Shake a mixture of 6 Gm. of the fluid extract, 20 Gm. of water, 120 Gm. of ether, and 10 Gm. of 10 per cent, soda solution, vigorously for five minutes antl then allow to stand for one hour. Then decant two separate portions of 50 Gm. of the ether solution, each representing 2.5 Gm. of the fluid extract, distill off the ether, dissolve the residue in 20 Cc. of yff hydrochloric acid and 20 Cc. of alcohol, filter, if necessary, wash the filter with a little alcohol, and titrate the excess of hydrochloric acid with TN0 soda solution, using cochineal, haematoxylin or rosoli...
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Add this copy of Proceedings of the American Pharmaceutical Association to cart. $17.91, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2018 by Forgotten Books.
Add this copy of Proceedings of the American Pharmaceutical Association to cart. $29.08, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2019 by Hardpress Publishing.
Add this copy of Proceedings of the American Pharmaceutical Association to cart. $29.08, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2019 by HardPress Publishing.
Add this copy of Proceedings of the American Pharmaceutical Association to cart. $30.68, new condition, Sold by Paperbackshop rated 4.0 out of 5 stars, ships from Bensenville, IL, UNITED STATES, published 2019 by HardPress Publishing.