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Duration of antacid effect for consistent neutralization of gastric acids. Ninety mililiters of test sample was added to 100 mL of artificial gastric juices at pH 1.2 in an artificial stomach. The duration was determined as the pH value was returned to 1.2. SJZT: Si-Jun-Zi-Tang; SLBZS: Shen-Ling-Bai-Zhu-San; CAP: Colloidal aluminum phosphate; SB: Sodium bicarbonate.
