Effect of moisture on crystallization of theophylline in tablets
- 1 January 1992
- journal article
- research article
- Published by Taylor & Francis in Drug Development and Industrial Pharmacy
- Vol. 18 (4), 453-467
- https://doi.org/10.3109/03639049209043863
Abstract
Needle-like crystals appeared on the surface of theophylline tablets containing anhydrous theophylline, hygroscopic materials such as potassium, and other formulation ingredients, when stored under conditions of high relative humidity. X-ray powder diffraction studies on these crystals showed that anhydrous theophylline was converted to the hydrate. Crystal growth was accelerated by increased moisture uptake in tablets containing the hygroscopic materials polyethylene glycol 6000 or sodium chloride. The appearance of needle-like crystals on the surface of tablets resulted in a decrease in the rate of release of theophylline.Keywords
This publication has 11 references indexed in Scilit:
- The dehydration kinetics of theophylline monohydrate powder and tablet.CHEMICAL & PHARMACEUTICAL BULLETIN, 1988
- Whisker Growth from Sodium Valproate-Synthetic Aluminum Silicate SystemsYAKUGAKU ZASSHI, 1987
- Crystallization of theophylline in tabletsInternational Journal of Pharmaceutics, 1986
- Studies on whisker growth on the tablet surface. III. Mechanism of whisker growth on aspirin tablet and its effect on the mechanical strength of the tablet.CHEMICAL & PHARMACEUTICAL BULLETIN, 1986
- Crystallization of Excipients in TabletsJournal of Pharmaceutical Sciences, 1985
- Formation of dihydrate from carbamazepine anhydrate in aqueous conditionsInternational Journal of Pharmaceutics, 1984
- Growth Behaviors and Mechanism of Caffeine whiskers on the GranulesYAKUGAKU ZASSHI, 1976
- Dehydration of Crystalline Theophylline Monohydrate and Ampicillin TrihydrateJournal of Pharmaceutical Sciences, 1973
- Crystal growth studies involving phase transitions in aqueous drug suspensionsJournal of Pharmacy and Pharmacology, 1969
- Phase transitions I. Preliminary study of theophylline hydrate—anhydrate systemJournal of Pharmaceutical Sciences, 1967