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[Determination of formulation quantities for three kinds of antacid using triangle coordinates].

We investigate the method for the determination of an appropriate mixing region of three kinds of antacid, magnesium hydroxide, dried aluminum hydroxide gel and calcium carbonate using triangular coordinates. Using the triangular coordinates, the appropriate mixing region of satisfying the following categories was determined; 1) acid neutralizing capacity (200 ml), 2) immediate action (pH 6-8 range obtained 10 min after pouring an antacid into 50 ml of 0.1 mol/l HCI (aq) sol.), 3) bowel property (mol ratio of Mg/Al = 1-3), and 4) quantities of combination of three antacids (under 700 mg of total quantities). Modified Fuchs Test was performed at some points which met the above conditions. The durability of the combination of these three antacids was evaluated. The following regions have long durability of antacids (about 60 min for persisting pH 3.5-5); magnesium hydroxide 40-60%, dried aluminum hydroxide gel 30-50% and calcium carbonate 10%. In the cases of changing the above mentioned conditions, and of using different kinds of antacid, the determination of the appropriate mixing region using triangular coordinates is effective for the pharmaceutical technology. In this study we emphasize the following striking features; utilization of triangular coordinates, fixing the combination of antacid, and incorporation of three kinds of antacid with aluminum, magnesium and calcium.