IR-SPECTROSCOPIC RESEARCHES OF CHITOSAN Bombyx mori AND ITS DERIVATIVES

Abstract

The present time, there is an increasing worldwide interest of specialists in chitosanbased preparations and its derivatives (carboxymethylchitosan, chitosan ascorbate and sulfochitosan), which are widely used in medicine and in agriculture. In this regard, it is important to identify the physicochemical characteristics of the obtained chitosan and its derivatives by various physical methods, in particular, infrared spectroscopy, the determination of their structures, in order to identify these materials to experimenters. IR-spectroscopic studies of the structure of chitosan, nanochitosan, ascorbate- and nanoascorbatechitosan, carboxymethylchitosan, and sulfochitosan were carried out. The features of the structure of chitosan and its derivatives were established and revealed, depending on the conditions of their synthesis. The IR- spectra of the samples studied clearly show the appearance of peaks corresponding to the functional groups introduced by modifying chitosan and describe in detail their effect on the change in the structure of chitosan. The results obtained were systematized and maps of IR spectra for chitosan and its derivatives were compiled, indicating the spectral region of the functional groups and the various types of bonds formed, which allows experimenters to identify and conduct a comparative analysis with chitosan derivatives.

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