title: Effect of pH on drug release from polysaccharide tablets.
abstract: Controlled release formations of drugs were prepared with matrix materials of the natural polysaccharides sodium alginate and +/--carrageenan. The drugs used were sodium salicylate (anionic) and lidocaine-HCl (cationic). The release characteristics of the drugs were studied under different pH and compositions of aqueous media. The cationic drug (lidocaine-HCl) was released more slowly than the anionic one (sodium salicylate) because of the negative charge of the matrices. The release from both sodium alginate and +/--carrageenan tablet was retarded in acidic medium. At the same pH of the medium, the release into buffer solutions (containing metallic cations Na(+) and K(+), respectively) was slower than into HC1 solution.
authors: Department of Chemical Engineering, College of Engineering and Bioproducts Research Center, Yonsei University, Seoul, Korea.
authors: H Y
authors: HY
authors: Park
authors: C R
authors: CR
authors: Choi
authors: J H
authors: JH
authors: Kim
authors: W S
authors: WS
authors: Kim