Aluminum hydroxides spectra

Tetracyclines, as broad-spectrum antibiotics, are the drugs of choice in treating Mycoplasma pneumoniae infections. Most tetracyclines are absorbed to various degrees (30 to 100%) from the gastrointestinal tract, primarily from the stomach and upper small intestine. The absorption of tetracyclines is hindered by milk and milk products, by numerous antacids such as aluminum hydroxide, sodium bicarbonate, and calcium carbonate, and by iron preparations such as ferrous sulfate. Therefore, these and similar substances should not be administered orally together with tetracycline (Figure 3.4). 

Figure 6.1 DRIFTS spectra (samples diluted to 5% w/w in finely ground KBr) showing the interaction of isostearic acid with aluminum hydroxide (a) aluminum hydroxide (Alcan SFl 1-E) treated with about 0.7 monolayers of isostearic acid, (b) untreated aluminum hydroxide reference substrate, and (c) substrate subtracted spectrum (i.e., (a-b) multiplied by 5 to enhance peaks) showing (i) C—H stretching...

Examination of the infrared spectrum of a pure well-crystallized clay mineral can yield considerable information on its structure and composition in some instances, a species can be more quickly and more fully defined in structure and composition by this technique than by any other single technique. Few soil clays, however, are single species. In general, they are a complex mixture, which may include several layer silicates (either interstratified or as separate species), feldspars, various forms of silica, oxides and hydroxides of iron and aluminum, carbonates, sulphates, and phosphates. These minerals may well be poorly ordered, and associated with varying amounts of amorphous material. Not infrequently amorphous components predominate. As isolated, the clays may contain considerable amounts of organic matter, firmly combined with the inorganic constituents. 

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