Free radical scavenger activity of chitosan and its aminated derivative.

1 Polymer research department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications. New Borg ElArab, Alexandria, Egypt. 2 Laboratory of Bioorganic Chemistry of Drugs, Institute of Experimental Pharmacology and Toxicology, SK-81404 Bratislava, Slovakia. 3 Chemistry Department, Faculty of Science, University of Jeddah, Osfan, P. O. Box: 80203, Jeddah 21589, Saudi Arabia.