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Powdered tablets from the Antacida group: Alusal, Milk of Magnesia, Alumag, Maalox, Magnosil, Alugastrin, Malugastrin, Rennie, and components deciding about their antiacidity like Al(OH)3, Mg(OH)2, Mg2Si3O8, NaAl(OH)2CO3, MgAl(OH)(SO4)2, CaCO3, MgCO3, were subjected to infrared spectrophotometric investigations. It was found that infrared spectra of each pharmaceutical compound are different and show a series of characteristic maxima, by which they can be identified with in the spectral range of 4000 cm-1-200 cm-1. Comparison of infrared spectra of finished products with spectra of their components it was showed that the application of infrared spectrophotometry methods enabled us to prove the presence of particular compounds used in formulations. Tablet mass and odorizing agents do not cause significant changes in spectra of the tablets studied, preparations from the Antacida group.

Aluminium phosphate was precipitated from AlCl3-H3PO4 and NaOH, NH3H2O and NaHCO3--Na2CO3 mixture up to different pH values. The precipitates were dried at room temperature, 40 degrees and 105 degrees and their neutralizing properties (rate of neutralization and acid-consuming capacity) against 0.l N HCl were investigated. It was found that these properties depend on the nature of the reagents used for the formation of AlPO4, the pH and also the temperature of drying. The best antacid properties shows the AlPO4 preperation obtained from AlCl3-H3PO4 and NaHCO3-Na2CO3. For comparison, the therapeutic preparate "Aluphos" was also investigated.