100 Mg Doxycycline

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100 Mg Doxycycline

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Pharm. Joum., July 13, 1907, 43 ; from Journ. de Pharm. et Chim., 26 (1907), 43- Hydrargyri et Potassii lodidunty Br, Ph, Codex Criticism of Formulas and Composition, In the B. P. Codex a salt is described under the name of Hydrargyri et Potassii lodidum, to which, as prepared by methods indicated, the formula Hg,K2l63H20 is assigned, and which is described as occurring in yellow prismatic crystals, soluble in water, alcohol and ether. W. A. H. Naylor and E. J. Chappel have endeavored to obtain a salt of the composition indicated, and communicate the character and results of their experiments which lead them to the following conclusion : That the salt prepared by the first of the " Codex " methods does not correspond in composition with the formula KaHg,Ie3H20, that it is not a definite chemical compound, but that it contains an admixture 100 Mg Doxycycline of potas- sium iodide ; that it is not completely soluble in ether ; and that the statement regarding its solubility in water is only partly 100 Mg Doxycycline correct. Further- more, since by the second process salts soluble in water may result, whilst the true (Hgl2KI)23H20 is decomposed by that liquid, these salts must contain more potassium iodide than the formula requires. The authors have however devised a method whereby a salt containing the two iodides in molecular proportions may be obtained, either by using water or alco- hol as solvent, the latter being preferred : 45 Gm. mercuric iodide, 16.5 Gm. of potassium iodide, and 20 Cc. alcohol (90 per cent.) are used. Finely powder and intimately mix the two salts, and then boil the mix- ture with the alcohol till only traces of impurities remain undissolved ; filter the solution through a hot-water funnel and allow to cool. The crystals which separate are collected and dried with as little exposure to the air as possible (small quantities are best dried in a desiccator over sulphuric acid). By slow evaporation of the mother liquor in dry air, further crops of yellow needle-shaped crystals are obtained. The solution should not be evaporated to complete dryness, as a small quantity of mercuric iodide may be liberated during the last stages of the evapora- tion. The salt must be preserved in well-stoppered bottles, as it is readily decomposed by moisture. The first crop of crystals obtained contains rather more of the iodide and less water of crystallization than later crops, but the difference is small, and the other part of the salt yields results in close agreement with those required for (HgI,KI)j3H,0. Pharm. Journ., Mar. 7, 1908, 315-316. Hydrargyrum Oxy datum Via Humida Paratum Proposed Formula for Digitized by VjOOQlC MINIUM. 287 ihe G. P, The pharmacopceial revision committee of the Rhenish Chamber of Apothecaries proposes the following formula and process for preparing yellow mercuric oxide by the humid method, providing for its immediate incorporation into ointment : 27.1 parts of mercuric chloride are dissolved in 550 paits of warm water; the cooled solution is filtered into a mixture of 80 parts of solution of sodium hydroxide and 150 parts of water, contained in a tared porcelain mortar, and washed by subsidence and careful decantation until a chlorine reaction is no longer obtained. The precipitate is then freed from excess of water by absorption with a strip of filter- paper until its weight is reduced to 60 parts, and it is then incorporated by trituration with 40 parts of anhydrous wool-fat and 100 parts of white American vaselin, to make 200 parts of ointment. Allowing a loss of 1.6 parts of mercuric oxide by the washing, the finished ointment contains 10 per cent, 100 Mg Doxycycline of this medicament. It must be protected from light. Apoth. Ztg., xxiii (1908), No. 18, 179. Mercuric Peroxide New Method of Preparation, Referring to the work of Bredig and Antropow (see Proceedings, 1907, 856), Giovani Pellini gives the following new method for preparing mercuric peroxide, HgO, : 5 Cc. of an alcoholic solution of mercuric chloride (32 Gm. to 100 Cc.) are mixed with 10 Cc. of 30 per cent, hydrogen dioxide ; the mixture is diluted with a little alcohol, cooled to 0 C, and the necessary quantity of alcoholic potassium hydroxide for complete precipitation is added. 100 Mg Doxycycline The yellow precipitate at first formed becomes red on shaking 100 Mg Doxycycline ; 100 Mg Doxycycline it is then washed with ether and cooled to o** C. So obtained, mercuric peroxide forms a brick-red, amorphous mass, which is decomposed by water, spliting off oxygen, and forming hydrogen dioxide and mercuric oxide. It dissolves readily in acids with formation of mercuric salts and hydrogen dioxide. Apoth. Ztg., xxii (1907), No. 94, 1022 ; from Atti. R. Accad. de Line, 19^7, 408. LEAD. Minium Improved Method of Examination, The G. P. Ill method for the examination of minium directed the use of sugar as reducing agent, which, although somewhat tedious, was fairly satisfactory. The G. P. IV directs the use of oxalic acid instead of sugar, but this has been found by K. Dieterich to be not only more tedious, but to yield unreliable results. Discussing this subject, A. Partheil points out that the oxalic acid method is perfectly worthless, since it results in the formation of more or less insoluble precipitates of lead oxalate, which are variable in composition, and to the extent of their presence increase the amount of undissolved residue, which should not exceed 0.035 G fr^" 2.5 Gm. of minium. He finds lactic acid to be the most efficient reducing agent, giving practically accurate results with greater expedition than is possible with sugar as reducing agent, and 100 Mg Doxycycline recommends the following method for Digitized by Google 288 REPORT ON THE PROGRESS OF PHARMACY. indusion in the next Pharmacopoeia : Place 100 Mg Doxycycline 2.5 Gm. minium in a wide- mouthed Erlenmeyer flask of about 200 Cc. capacity, add 10 Cc. water^ 5 Cc. lactic acid and 10 Cc. nitric acid (25 per cent.), and carefully rotate the contents of the flask. In a short time ( i to 2 minutes in the case of 100 Mg Doxycycline good samples of minium) the solution of the minium is completed^ with lively evolution of carbon dioxide and acetaldehyde ; the undis- solved portion is collected on a tared filter, washed with water, dried to constant weight, and weighed. 100 Mg Doxycycline While very slightly higher results were obtained in most cases on repeating the examination of the same (51) samples by the sugar-method, the lactic acid excels in convenience and celerity. 100 Mg Doxycycline The results are given in a table showing the source, designa- tion, percentages of residue obtained by the lactic acid- and sugar- methods respectively, and the percentages of lead peroxide (PbOi) de- termined in the samples by the method of Topf ; the latter depending on the titration of iodine liberated under the conditions of the test. ^Aich. d. Pharm., 245 (1907), No. 7, 519-528. Minium Use of Hydrogen Dioxide for Its Examination, According 100 Mg Doxycycline
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