The effects of thickness and hardness of the coating film on the drug release rate of theophylline granules coated with chitosan-sodium tripolyphosphate complex.
D002626:Chemistry, Pharmaceutical; D002686:Chitin / Q000031:analogs & derivatives; D048271:Chitosan; D006244:Hardness; D011122:Polyphosphates; D011208:Powders; D013608:Tablets, Enteric-Coated; D013806:Theophylline / Q000008:administration & dosage*
D011122:Polyphosphates; D011208:Powders; D013608:Tablets, Enteric-Coated; D002686:Chitin; D048271:Chitosan; D013806:Theophylline; C005692:triphosphoric acid