Modified starches as hydrophilic matrices for controlled oral delivery III. Evaluation of sustained-release theophylline formulations based on thermal modified starch matrices in dogs
1990; Elsevier BV; Volume: 63; Issue: 3 Linguagem: Inglês
10.1016/0378-5173(90)90125-n
ISSN1873-3476
Autores Tópico(s)Food composition and properties
ResumoAbstract The sustained-release of theophylline from several thermal modified starch matrices was evaluated in dogs in comparison to the commercial formulation Theodur 300. Matrices formulated with starches containing 70% amylose revealed a minor shift in tmax in comparison with a conventional tablet. The matrices containing amylose free starches showed tmax values of ±4 h. Starch matrices containing 25% amylose demonstrated a good sustained-release performance, comparable to Theodur 300. The influence of the drug/starch ratio was investigated on two types of starches containing 25% amylose: drum dried corn starch and extruded corn starch. A starch/drug ratio between 50 50 and 70 30 showed no significant influence on the biopharmaceutical parameters investigated.
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