Imobilização da quitosana da carapaça de siri Charybdis hellerii em filmes poliméricos a partir de sua obtenção com o uso da radiação ionizante [thesis]

Maiara Salla Ferreira
2016 Aos meus pais Waldyr e Rosa Maria por todo amor e compreensão, sempre, em todos os momentos. comparável á quitosana padrão (SA), dependendo das condições de irradiação. Além disso, apresentou inibição da atividade bacteriana tanto livre como imobilizada em substratos poliméricos de polipropileno e de polietileno processados também por radiação ionizante. Palavras-chaves: Quitosana, inativação bacteriana, imobilização. ABSTRACT Chitosan is a polysaccharide obtained from chitin's molecule
more » ... hitin's molecule deacetylation, which is the main composition of certain fungi species and crustaceans and insects exoskeleton. The amino groups present in chitosan give it important biological properties such as biodegradability and biocompatibility, activity/immunological effects and antibacterial healing. The deacetylation of chitin is an aggressive process, which reaction processes in 6 to 8 hours under hot concentrated alkali solution. In this work, Charybdis hellerii crab shell's was fragmented and pre-treated for chitosan obtention and each conversion step, from in natura material pre-treatment to final chitosan, were investigated in deteails. It was observed dose and dose rate have not influence neither pre-treatment nor chitin deacetylation steps; at 20 kGy (from gamma or electron beam sources), the conversion process was performed in 60 minutes. The obtained chitosan presented low weight and deacetylation degree compared to standard chitosan, considering specific irradiation conditions. Also, obtained chitosan presented bacterial inactivity as a free compoud as immobilized onto polymeric substrates such polypropylene and polyethylene, also processed by ionizing radiation.
doi:10.11606/d.85.2017.tde-12122016-132955 fatcat:dem4dogpuvavdamib5csqrc3sa