N Yaghobi - Iran Polymer and Petrochemical Institute, P.O.Box 14965/115, Tehran, Iran
H Mirzadeh - Department of Polymer Engineering, Amirkabir University of Technology, P.O.Box15875/4413, Tehran, Iran
F Hormozi - Iran Polymer and Petrochemical Institute, P.O.Box 14965/115, Tehran, Iran
M.H VAKILI - Department of Polymer Engineering, Amirkabir University of Technology, P.O.Box15875/4413, Tehran, Iran

Knowledge on the molecular weight and degree of deacetylation of its samples is essential for its applications and molecular weight is the main factor affecting properties ofchitosan [1]. This work focuses on reaching complete deacetylation without degrading the polymeric chain of chitosan during the process. In this study, a method was developed for chitosan preparation in order to control the molecular weight with high DD. Subsequently, a novel database is offered to prepare chitosan with different molecular weights and degrees of deacetylation through multistage trearment.