HETEROGENEOUS DEACETYLATION OF CHITIN DEGRADED WITH HYDROGEN PEROXIDE IN A MICROWAVE FIELD
Journal Title: Progress on Chemistry and Application of Chitin and its Derivatives - Year 2009, Vol 0, Issue
Abstract
Two-step procedure of obtaining chitosan with tailored properties has been elaborated. In the first step chitin from the shells of krill (Euphausia superba) and common shrimp (Crangon crangon [L.]) was subjected simultaneously to a microwave radiation field and hydrogen peroxide. The effect of this kind of chitin treatment was obtaining introductory degraded chitin. In the second step alkaline hydrolysis of the degraded chitin was carried out. The susceptibility of the amide bonds of degraded chitin to alkaline hydrolysis was evaluated by estimating the deacetylation degree of the chitosans obtained from standard and degraded chitin. It was found, that subjecting chitin initially to a microwave field and hydrogen peroxide under the conditions presented in this paper did not substantially alter the susceptibility of the chitin amide bonds to further alkaline hydrolysis as compared with standard chitin. ���������������������������������������������The introductory reduction of chitin polymeriz��ation degree with hydrogen peroxide in a microwave field permitted obtaining chitosan with low molecular weights without disadvantageous alterations in their chemical structure. It was also determined that the yield of chitosan depends on the initial degree of polymerization of the chitin.
Authors and Affiliations
Anna Wojtasz-Pająk, Joanna Szumilewicz
Keywords
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