Showing papers on "Aluminium hydroxide published in 1972"

The effect of aluminium hydroxide on calcium, phosphorus and aluminium balances, the serum parathyroid hormone concentration and the aluminium content of bone in patients with chronic renal failure.

Abstract: 1. Eight patients with chronic renal failure (creatinine clearance 4·9–22·0 ml/min) were given 75–150 ml of aluminium hydroxide gel (‘Aludrox’) daily for 20–32 days. 2. In all patients there was a decrease in plasma phosphorus. The phosphorus balance became more negative in four and less positive in one, remained unchanged in two, and became positive in one. 3. Patients absorbed 100–568 mg of aluminium daily. In two of three patients the content of aluminium in the iliac bone increased but not above normal values. 4. The concentration of parathyroid hormone was decreased by aluminium hydroxide therapy in three patients in whom there was an increase in plasma calcium and in one other patient in whom plasma calcium did not change.

The thermal transformation of Gelatinous Aluminium Hydroxide

Abstract: The thermal transformation of the gelatinous aluminium hydroxides (amorphous and pseudoboehmite) prepared from aqueous aluminium chloride solution on addition of sodium hydroxide at various pH, have been studied by X-ray diffraction, infrared spectra and thermal analyses. As a result, it is concluded that the gelatinous aluminium hydroxides transform thermally as follows: amorphous aluminium hydroxide amorphous alumina γ-alumina θ-alumina α-alumina, pseudoboehmite γ-alumina θ-alumina α-alumina. Further the thermal transformation of bayerite, prepared from the aqueous solution at higher pH, and of boehmite, prepared hydrothermally from gelatinous aluminium hydroxide, have been investigated in comparison with those of gelatinous aluminium hydroxide. Die thermische Umwandlung Von gelartigen Aluminiumhydroxiden Die thermische Umwandlung von gelartigen Aluminiumhydroxiden (amorph oder Pseudoboehmit-Typ), die aus wasriger Aluminiumchlorid-Losung durch Zugabe von Natriumhydroxid erhalten werden, wird rontgenographisch, IR-spektroskopisch und durch thermische Analyse untersucht. Als Ergebnis ergibt sich, das die gelartigen Aluminiumhydroxide sich thermisch in folgender Weise umwandeln: Amorphes Al(OH)3 amorphes Al2O3 γAl2O3 θAl203 αAl2O3 Pseudoboehmit γ-Al2O3 θAl2O3 α Al2O3. Ferner wird die thermische Umwandlung von Bayerit (aus wasriger Losung bei hoherem pH dargestellt) und von Boehmit (aus gelartigem Aluminiumhydroxid hydrothermal dargestellt) untersucht im Vergleich zu jener von gelartigem Aluminiumhydroxid.

Preparation of Gelatinous Aluminium Hydroxide

Abstract: The gelatinous precipitates from aqueous aluminium salt solutions on addition of alkalies under various conditions have been examined by X-ray diffraction study, infra-red spectroscopy, thermogravimetry, and differential thermal analyses. The factors of the preparation influencing the composition of gelatinous aluminium hydroxide have been investigated in the basis of the results obtained. Darstellung von gelartigen Aluminiumhydroxiden Die unter verschiedenen Bedingungen erhaltenen gelartigen Niederschlage aus wasrigen Aluminiumsalzlosungen bei Zusatz von Alkalien werden rontgenographisch, durch IR-Spektroskopie, thermogravimetrisch und durch DTA untersucht. Auf Grund der erhaltenen Ergebnisse werden die Parameter der Herstellungsbedingungen auf die Aluminiumhydroxid-Gele untersucht.

Determination of water content by means of the Derivatograph

Abstract: The determination of water content by means of the Derivatograph is treated in the paper. The determination of water in analytical precipitates, various pharmaceutical products, biological substances, the products of food industry is treated on the basis of some practical examples. The applicability of the Derivatograph for determining the adsorption capacity of industrial adsorbents, the hydration conditions of cement, the system Ca3A-CaSO4 · H2O and the rehydrability of clay minerals is demonstrated. The aluminium oxide barrier layers were investigated on the basis of the water content of the aluminium hydroxide. For the characterization of the different strengths by which water is bound in strontium chloride hydrates the apparent activation energies are also presented.

Preconcentration of trace elements by aluminium hydroxide

Abstract: Coprecipitation of traces of cobalt, zinc, chromium, ruthenium and mercury with freshly precipitated aluminium hydroxide has been investigated by a radiotracer method. Investigations were performed over a wide range of pH. The results indicate that traces of cobalt, zinc and chromium could be almost completely coprecipitated between pH 6 and 10. On the other hand coprecipitation yield for ruthenium in this pH range do not exceed 95%, which is believed to be the consequence of the various physicochemical states of ruthenium. The coprecipitation yields for mercury are very low as a consequence of the presence of non-ionized HgCl2.

Magnesium-Containing Antacids to Patients with Uremia—An Intoxication Risk

Abstract: Twelve uremic patients were loaded with an-tacidum perorally under standardized conditions. In paired control tests, aluminium hydroxide alone or aluminium hydroxide + 0.5 g magnesium carbonate/24 hours were administered. As early as after 3–5 days, a significant increase in serum magnesium could be observed which indicated resorption and impaired magnesium excretion. Because of the danger of magnesium intoxication, only pure aluminium hydroxide preparations are recommended in the treatment of uremia with hyperphos-phatemia or gastritis.

Preparation and Phase Changes of Amorphous Alumina

Abstract: Amorphous alumina was prepared (i) from aluminium nitrate solution at pH 6.0 and 9.0 and (ii) by coprecipitationfrom aluminium nitrate solution containing 5% magnesium and chromium nitrate at pH 9. Phase changes taking place in them during calcination were compared with those of aluminium hydroxide by DTA and X-ray diffraction techniques.DTA of the prepared samples generally showed a sharp endothermic peak at 325°C, corresponding to the dehydration of the possible traces of fine gibbsite and an exothermic peak at 345° C which could be considered as characteristic of amorphous phase. Aluminium hydroxide, however, showed three endothermic peaks at 240°, 325° and 540°C corresponding to the coarse gibbsite to boehmite conversion, gibbsite dehydration and boehmite dehydration respectively.The X-ray diffraction study of the prepared samples showed mostly amorphous patterns. When calcined to 750°, 950° and 1450°C respectively the gamma, delta and alpha phases were formed.

Coprecipitation of cobalt in the presence of aminoacids and citrates

Abstract: The radioactive tracer method has been applied for the investigation of the influence of citric acid and amino-acids on the coprecipitation yield of cobalt traces with aluminium hydroxide precipitates. Results indicate that the presence of citric acid decreases the coprecipitation yields when 7 > pH > 8.5. Amino-acids decrease the cobalt coprecipitation yield at pH values above their isoelectric point. However this could be valid only for amino-acid concentrations above 10−4 M. Results also indicate pH regions where certain cobalt species could be separately coprecipitated on the basis of different coprecipitation yields.

SALTS OF 3-ACETYL-18beta-GLYCYRRHETINIC ACID AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

Abstract: 1285453 Antacid &c compositions DOTT INVERNI & DELLA BEFFA SpA 5 Aug 1970 [30 May 1969] 27581/69 Heading A5B [Also in Division C2] Pharmaceutical preparations contain compounds of the formula M(Glyc.) x (OR) m-x (wherein M is Li, Na, K, Ca, Mg, Al or Bi, Glyc. is a 3-acetyl-18#-glycyrrhetinic acid group, OR i's OH or O alkyl, m is the metal valency and x is a positive integer equal to or less than m and suitable carriers or diluents. They have healing, anti-ulcer and anti-inflammatory properties and the properties of the metal, particularly antacid action. They may also contain added antacids, e.g. glycine, aluminium hydroxide and aluminium silicate. Tablets, a powder, suppositories, pessaries and an ointment containing aluminium tri-3-acetyl- 18#-glycyrrhetinate and magnesium di-3-acetyl- 18#-glycyrretinate are described. The ointment also contains lidocaine hydrochloride.