Bismuth tannate

Other compounds used in medicine include bismuth ammonium citrate (Bi(NH4)3(C6H507)2), bismuth citrate (BiC6H507)2), bismuth subgallate (Bi(0H)200CC6H2(0H)3), and bismuth tannate. These compounds are used to treat a large variety of problems, including burns, stomach ulcers, and intestinal disorders, and in veterinary applications. 

Bismuth Tannate. Tan bismuth tannic acid bismuth derivative. Contains about 36% bismuth equivalent to 40% BijOj. Prepd from freshly pptd bismuth hydroxide and tannin Hagers Handb. Pharm. Praxis Band 1 685 (Berlin. 1930). 

HaO). Quinine salicylate, 2[B. CgH4(OH)(COOH)]. HaO, forms colourless needles, m.p. 187° (dec.), which slowly become pink in air. It is soluble in water (1 in 77 at 25°), alcohol (1 in 11 at 25°), or chloroform (1 in 37 at 25°). The foregoing are the most important quinine salts used in medicine, but many other salts have been used, e.g., the tannate, formate, valerate, ethylcarbonate, lactate, cacodylate, etc., as well as double salts such as quinine bismuth iodide. Descriptions of many of these salts will be found in the British Pharmaceutical Codex for 1934. 

When solutions of lead or bismuth salts are treated with alkali hypo-bromite, lead peroxide and higher oxides of bismuth are formed. These products react with benzidine acetate to give benzidine blue (seepage 282). However, if bismuth salts are heated alone with alkali hydroxides, a yellow precipitate forms, [probably BiO(OH)] and, when once formed, is not converted into higher bismuth oxides on treatment with h3q)obromite. This resistance is applied in the detection of lead in bismuth salts. The following procedure is recommended in the examination of pharmaceutical bismuth preparations (e.g., bismuth sub-gallate, -tannate, -salicylate). 

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