Darstellung von Chitinderivaten zur antimikrobiellen Ausrüstung von Textilien
In this work, chitin, the second most abundant biopolymer in the nature, was used as antimicrobial agent for textile finishing. Antimicrobial agents can protect textiles from attack of microorganisms, which are the reason for the damage of textiles and for the discomfort of the people. Chitin is known as skin friendly, nontoxic and environmentally sound antimicrobial agent. Chitin is not soluble in water, thus it has to be derivatized for application in textile finishing which is performed usually from aqueous media. At first, chitosan, the deacetylated form of chitin, was depolymerized with sodium nitrite to produce chitooligosaccharides. The degree of polymerization was determined by colorimetry. Furthermore, chitosan was modified with quaternary ammonium groups to get a better soluble product and at the same time a better effect against bacteria. For this, chitosan was reacted with diethylaminoethyl groups at the hydroxy and amino groups. The synthesized product was characterized with the help of IR-, Raman-, NMR- and 2D-NMR-spectroscopy as well as by elemental analysis and TGA. The degree of substitution was determined by means of NMR-spectroscopy, elemental analysis and conductometry. The synthesized product was then quaternized with ethyliodide, dimethylsulfate or diethylsulfate. The structure of the products was confirmed by IR-, Raman- and NMR-spectroscopy. The degree of quaternization was determined with the help of NMR-spectroscopy, elemental analysis and XPS. The synthesized chitosan derivatives were applied onto textiles. Polycarboxylic acid was used to fix the chitosan derivatives on cotton fabrics. The amount of the fixed derivatives on the fabrics was determined by means of elemental analysis. Furthermore, the chitosan derivatives were subjected to antimicrobial tests in solution. TEAE-chitosaniodide and MDEAE-chitosanmethylsulfate show very good activity against Vibrio fischeri, Bacillus subtilis and Escherichia coli.
info:eu-repo/classification/ddc/540, Ausrüstung <Textiltechnik>, Antimikrobieller Wirkstoff, Chitinderivate, Chemische Synthese, Chemie, Chitin, Chitosan, antimikrobielle Wirkstoff, Textilien, Baumwolle
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