Structure and thermal properties of chitin and chitosan from various sources
Аннотация
Abstract The structural and thermal properties of chitin and chitosan isolated from different sources ( Artemia sp.cysts (from the Aral Sea) and Silkworm pupae (Bombyx mori) ) were studied by using FTIR, XRD, and DSC. It is shown, that the chitin and chitosan samples from different sources have a similar structure, however, depending on the sources differ in the ratio of the phase composition. Two types of crystalline modification of the structure ( α -and β-modifications ) are observed for chitin isolated from Artemia sp.cysts. The chitin isolated from Bombyx mori has three polymorphs ( α -, β -and γ-modifications ) with orthorhombic, monoclinic and triclinic syngonies. The thermal stability of chitin and chitosan samples was also depended on sources.