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Gewählte Publikation:

Sousa, F; Guebitz, GM; Kokol, V.
(2009): Antimicrobial and antioxidant properties of chitosan enzymatically functionalized with flavonoids
PROCESS BIOCHEM. 2009; 44(7): 749-756. FullText FullText_BOKU

Abstract:
Chitosan fibres were grafted with flavonoids using tyrosinase to produce reactive o-quinones which subsequently react with primary amino groups of the chitosan. The reaction mechanism using chemically different flavonoids (flavanols, flavonols, flavone, flavanone, isoflavone) was followed by UV/vis spectroscopy and the successful grafting was demonstrated by ATR-IR spectroscopy, pH potentiometric titration and reflectance measurements. An increase of antioxidant activity of functionalized chitosan fibres using well established methods was found depending on the type of the flavonoid used. In addition, some flavonoids increased antimicrobial activity of chitosan against Bacillus subtillis and Pseudomonas aeruginoso. (C) 2009 Elsevier Ltd. All rights reserved.
Autor*innen der BOKU Wien:
Gübitz Georg
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Chitosan
Flavonoids
Tyrosinase
Grafting
Antioxidant and Antimicrobial activity


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