File:American journal of pharmacy (1899) (14783102472).jpg

Identifier: americanjournal711899phil (find matches)
Title: American journal of pharmacy
Year: 1835 (1830s)
Authors: Philadelphia College of Pharmacy Philadelphia College of Pharmacy and Science
Subjects: Pharmacy Pharmacology
Publisher: Philadelphia : Philadelphia College of Pharmacy
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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t. THE ASSAY PROCESS FOR CINCHONA. The cinchona should be in fine powder for complete exhaustion,and the harder the bark the finer the powder should be. The U.S.P.directs a No. 60 powder for its preparations, but No. 80 or finer forits assay process. The B.P. directs No. 60 for both preparationsand assay. But the results obtained here by the use of 10 per cent,acetic acid as a menstruum show that complete exhaustion is easilyobtained with a No. 9 powder for the assay process. The apparatus and management are, however, of great importancein obtaining complete exhaustion if the residue is to be, as it shouldbe, bitter-free when well chewed. This is so difficult and of so muchimportance that it appears to be worth while to offer a cut of anextractor that has been very successful in the extraction of nuxvomica and now in the still more difficult cinchona, and that is ex-pected to be equally applicable to many other substances. This simple apparatus is shown in operation. The flattened end
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Extractor. 314 Acetic Acid in Extracting Drugs. (Am-jjg^frm- of the test-tube has five small holes that cannot be shown, and asmall rubber band is better to hold the syphon in place than thewedge as shown. The apparatus is easily made up from laboratorymaterials by any fairly expert glass-worker, though it may becheaper to pay Greiner a dollar and a half for it. It is simply amodification on a small scale of the writers syphon percolator, nowso many years in successful use, in all sizes up to 100 gallons (seeProceedings of the Amer. Pharm. Assoc. for 1872). It is the bestform of percolator because it best applies the mechanical conditionsrequisite for complete exhaustion. That is, the whole mass of powderto be extracted is, from first to last, kept completely filled, insidethe particles and between them, with the extracting menstruum andcounterbalanced to an equilibrium by liquid that has already passedthrough the saturated powder. The syphon draws off the liquidfrom near the surface

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