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In vitro atenolol release zinc cross-linked beads prepared from (a) Sodium alginate; (b) N,O-dimethyl hydroxamated alginate (50%); (c) N,O-dimethyl hydroxamated alginate (100%); (d) N-methyl hydroxamated alginate (50%), (e) N-methyl hydroxamated alginate (100%), (f) O-benzyl hydroxamated alginate (50%), and (g) O-benzyl hydroxamated alginate (100%)
