Magnesium aluminium hydroxide

Thus synthesized forms of double magnesium-aluminium hydroxide appeared to be good anion exchangers they can be also used for the preparation of spinel MgAl204 by heating at temperature not above 800°C by adding aluminium hydroxide to achieve spinel stechiometry. 

Hebiig R, Boettcher M, Herman-Gnjidic Z, Pierce CH. Effects of magnesium/aluminium hydroxide-containing antacid, cimeti( ne or ranitidine on the pharmacokinetics of metrifonate and its metabolite DDVP. Clin Drug Invest (1999) 17, 67-77,... 

IwaoK, SaitohH, TakedaK, Azuumi Y, Takada ML Decreased pla a levels of omeprazole after cc dministration with magnesium-aluminium hydroxide dry suspension granules. Yaku-gaku Zasdn (1999) 119,221-8. 

Muir JF, Peiffer G, Richard MO, Benhamou D, Andrejak M, Hary L, Moore N Lack of effect of magnesium-aluminium hydroxide on the absorption of theophylline given as a pH-depend-ent sustained release preparation EurJ Clin Pharmacol (1993) 44, 85-8... 

Lohmann A, Grobara P, Dingier E. Investigation of the possible influence of the absorption of vinpocetine with concomitant application of magnesium-aluminium-hydroxide gel. Arzneim-... 

Mascolo, G. and Marino, O. 1980. A new synthesis and characterisation of magnesium-aluminium hydroxides. Ming-. Mae. 43 619-21. 

Hydrotalcite, Mg5A 2(0H)26C03.4H20, is one of the naturally occurring anionic clay minerals (Reichle 1986). The magnesium-aluminium hydroxide octahedra form positively charged layers and are stacked on top of each other. The carbonate ions are located between the layers as interlayer anions. These clays after heat treatment have been found to be catalysts for base catalyzed reactions. 

A process for obtaining cellulose ethers directly from deflbred hardwoods has been reported. Some aspects of the determination of the distribution of substituents in 0-ethylcelluloses have been investigated.Microcapsules of 0-ethylcellulose containing hydrous magnesium aluminium hydroxide have been prepared by a phase-separation procedure that uses solutions of the polymer in an organic solvent. ... 

H. 8-Hydroxyquinaldine (XI). The reactions of 8-hydroxyquinaldine are, in general, similar to 8-hydroxyquinoline described under (C) above, but unlike the latter it does not produce an insoluble complex with aluminium. In acetic acid-acetate solution precipitates are formed with bismuth, cadmium, copper, iron(II) and iron(III), chromium, manganese, nickel, silver, zinc, titanium (Ti02 + ), molybdate, tungstate, and vanadate. The same ions are precipitated in ammoniacal solution with the exception of molybdate, tungstate, and vanadate, but with the addition of lead, calcium, strontium, and magnesium aluminium is not precipitated, but tartrate must be added to prevent the separation of aluminium hydroxide. 

Antacids are neutralizing agents. Examples are magnesium hydroxide, magnesium trisylicate and aluminium hydroxide. Prior to the introduction of histamine-H2 receptor antagonists and proton pump inhibitors, they were the standard drugs for the treatment of duodenal/ peptic ulcers. Today their clinical use is limited to the treatment of dyspepsia and the symptomatic relieve for patients with peptic ulcers. 

Finely divided magnesium or aluminium hydroxides (or a 3 1 combination) are currently the best smoke suppressants. They also neutralise the acidic vapours produced from halogen-containing flame inhibiters. The more finely divide they are the more efficient they become. 

Antimony trioxide and chlorinated paraffinic derivatives are common materials used as fire retardants, as are intumescent zinc (or calcium) borate, aluminium hydroxide and magnesium hydroxide. These inorganic materials, used as bulk fillers, act to reduce the fire hazard. Halogenated materials release chlorine, which then combines with the antimony trioxide to form the trichloride, which is a flame suppressant. 

The carbon black generated by a fire from a rubber source increases the smoke density other products are highly toxic and often corrosive. The halogens, phosphates, borates, and their acids evolved during a fire corrode metals and electrical and electronic equipment. Hence many of the fire retardants described below cannot be used in situations where the toxic gases evolved will create their own hazards. In these cases inorganic hydroxides are used, at filler-type addition levels. Aluminium hydroxide and magnesium hydroxide are used as non-toxic fire retardant systems. 

The performance of aluminium hydroxide/magnesium hydroxide-filled systems can be enhanced by incorporation of zinc hydroxystannate in halogen-free rubbers giving reduced smoke and toxic gas emission, coupled with higher flame retardancy. This action will be complimentary to the water release and endothermic effects of aluminium hydroxide/magnesium hydroxide filler systems. 

Inorganic compounds such as aluminium hydroxide, sodium bicarbonate, and magnesium and calcium carbonates are commonly used as antacids. There is much scope for the redesign of these agents to achieve fine control of local pH values in the gastrointestinal tract via control of the rate of release of the active bases (e.g., from insoluble compounds). 

Gelatinous magnesium hydroxide Gelatinous aluminium hydroxide Gelatinous ferric hydroxide Thixotropic mud... 

Why are cimetidine and ranitidine better antacids than sodium hydrogencarbonate or magnesium or aluminium hydroxide ... 

Antacids e.g., magnesium trisihcate or aluminium hydroxide or antacid-alginate combinations... 

Keywords Fillers, Manufacture, Characterisation, Calcium carbonate. Talc, Mica, Wollas-tonite. Clays, Aluminium hydroxide. Magnesium hydroxide... 

Magnesium hydroxide occurs in nature as the mineral brucite. It has a Moh hardness of about 3 and a specific gravity of 2.4. It starts to decompose endothermically with the release of water at about 300 °C and the principal interest in it is as a flame retardant filler for thermoplastics such as polyolefins and polyamides, where the processing temperature is too high for aluminium hydroxide to be utilised effectively. For thermoplastic appHcations low aspect ratio particles are favoured with a particle size of about 1 micron and a specific surface area in the range 4-10 m2 g ... 

The general methods for the production of the alkali metals are (1) Electrolytic processes involving the electrolysis of (a) the fused hydroxide, or (b) a fused salt— chloride, nitrate, cyanide, etc. (2) Chemical processes involving the reduction of hydroxide, or carbonate, or other salt with carbon, metal carbide, iron, calcium, magnesium, aluminium, etc. W. Spring 5 claims to have reduced a little potassium chloride by passing hydrogen over the salt at a red heat. 

Alginic Acid + Aluminium Hydroxide + Magnesium Silicate Tablets (500 mg + 100 mg + 25 mg)... 

Aluminium Hydroxide + Magnesium carbonate/oxide + Simethicone Tablets (150 mg + 250 mg + 90 mg)... 

Aluminium Hydroxide + Magnesium Carbonate Dry Syrup (12.5% + 12.5%) page 2... 

Aluminium Hydroxide + Magnesium Hydroxide + Simethicone Suspension (8% + 8% + 0.8%)... 

II. Dissolve the flavours and saccharin in water and suspend aluminium hydroxide, magnesium hydroxide and Kollidon CL-M. 

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