0 G.V. Murali Mohan Babu Ch. D. S. Prasad K. Hima Sankar Cheruvu P. S. Narayan K.V. Ramana Murthy 2001 Evaluation of Gum Karaya as Carrier in the Design of Oral Controlled Release Hydrophilic Matrix Systems Acta Pharmaceutica 51 273 Gum Karaya