Protein-based films cross-linked with 1-ethyl-3-(3-dimethylamino-propyl) carbodiimide hydrochloride (EDC): effects of the cross-linker and film composition on the permeation rate of p-hydroxyacetanilide as a model drug

Journal of the Brazilian Chemical Society

Soldi, Valdir¹  Porto, Ledilege C.¹  Fayad, Samira J.¹  Universidade Federal de Santa Catarina, Florianópolis, Brazil¹  Cristiano, Cláudia M. Z.¹ 

关键词: gelatin;    casein;    films;    cross-linking;    drug permeation;   

DOI  :  10.1590/S0103-50532010000200021

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Cross-linked films of gelatin (Gel), casein (Cas) and their (1:1, m/m) mixture (Gel/Cas) were studied in terms of their thermal, morphological and water absorption properties and the permeation profile of p-hydroxyacetanilide (p-HAA) as a model drug. The degrees of cross-linking by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) were 90.6% for Gel films and approximately 70% for Cas and Gel/Cas films. The totally soluble non cross-linked films achieved only 21 - 22% of solubility after cross-linking with EDC. Despite the high cross-linking degree, the swelling of Gel films (87.2%) was practically twice that determined for Gel/Cas and Cas films. The permeation rate of p-HAA followed the order Gel>Gel/Cas ≅ Cas for cross-linked films, which is consistent with the Gel film showing a greater swelling than the other two systems studied. Lower permeation rates were observed for Cas and Gel/Cas films, suggesting that these could be used as rate-controlling systems for drug permeation. For the different mathematical models applied, the systems studied did not show a good fit with the first-order equation and only a partial fit with the zero-order equation and Higuchi's model. However, good correlations (r2  > 0.99) were obtained using the power law equation (n = 0.70 - 0.87), indicating that the p-HAA permeation through the films was mainly controlled by a diffusion mechanism.

【 授权许可】

Unknown