PREPARATION AND PROPERTIES OF CHITOSAN FROM CRAB SHELL CONTAINING RAW MATERIAL BY ELECTROPHYSICAL PROCESSING

Abstract

Traditional technologies of chitosan producing involve the use of hard alkali-acid
treatment of crab shell raw materials, which negatively affects the main quality
parameters of chitosan (molecular weight, the degree of deacetylation). We
propose an alternative technical approach. It involves the use
ofelectrohydraulicshocks,whichuseextra-long bits.Theproposed approach has the
following advantages:the stages of grinding and deproteinizationof the raw
materialsare combined,the additional use ofalkaliis excluded at the stage of
deproteinization.For comparative characteristics of the structure of the polymer the
IR-spectra of the samplesof chitosanwere removed. Chitosan, obtained using
electrohydraulic treatment is not inferior in its physico-chemical parameters of
chitosan, obtained by using alkaline reagents. It is possible to organize the process
of chitosan production on the base of the enterprises for shrimp processing.
Specific requirements for physico-chemical and functional properties of chitosancontaining
substances make the actual means and methods of control of the target
parameters, the key of which are qualitative identification and comprehensive
determination of chitosan in the composition of film-forming compositions and
films coatings. As the chromophore to measure the surface potential of the chitosan
substances, we used 1-aniline-8-naphthalenesulfonate (ANS). The maximum
fluorescence of the dye in chitosan films is shifted to longer wavelengths compared
to chitosan gels, because of the increased polarity of the medium of films on the
attitude to gel-like chitosan substances. The data obtained by thefluorimetric
studies can be used in the development of methods for the detection of chitosan.