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Antimicrobial Activity of Lignin-Derived Polyurethane Coatings Prepared from Unmodified and Demethylated Lignins

  • Due to global ecological and economic challenges that have been correlated to the transition from fossil-based to renewable resources, fundamental studies are being performed worldwide to replace fossil fuel raw materials in plastic production. One aspect of current research is the development of lignin-derived polyols to substitute expensive fossil-based polyol components for polyurethane and polyester production. This article describes the synthesis of bioactive lignin-based polyurethane coatings using unmodified and demethylated Kraft lignins. Demethylation was performed to enhance the reaction selectivity toward polyurethane formation. The antimicrobial activity was tested according to a slightly modified standard test (JIS Z 2801:2010). Besides effects caused by the lignins themselves, triphenylmethane derivatives (brilliant green and crystal violet) were used as additional antimicrobial substances. Results showed increased antimicrobial capacity against Staphylococcus aureus. Furthermore, the coating color could be varied from dark brown to green and blue, respectively.

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Document Type:Article
Author:Stephanie Elisabeth Klein, Abla Alzagameem, Jessica Rumpf, Imke Korte, Judith Kreyenschmidt, Margit Schulze
Parent Title (English):Coatings
Article Number:494
Place of publication:Basel
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2019/08/05
Funding Information:Funding: This research was supported by the Federal Ministry of Education and Research (BMBF) program “IngenieurNachwuchs” project LignoBau (03FH013IX4) and EFRE Infrastrukturförderung “Biobasierte Produkte” (EFRE0500035).
Keyword:antimicrobial activity; brilliant green; crystal violet; demethylation; lignin; polyurethane coatings; triphenylmethane dyes
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Projects:LignoBau - IngenieurNachwuchs 2014: Lignin-basierte Polymere für bauchemische Anwendungen (DE/BMBF/03FH013IX4,13FH013IX4)
Biobasierte Produkte (EFRE/0500035)
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Open access funding:Hochschule Bonn-Rhein-Sieg / Graduierteninstitut
Entry in this database:2019/08/10
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International