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Preserving cultural heritage: Analyzing the antifungal potential of ionic liquids tested in paper restoration


Autoři: Kevin Schmitz aff001;  Sebastian Wagner aff001;  Manfred Reppke aff001;  Christian Ludwig Maier aff002;  Elisabeth Windeisen-Holzhauser aff001;  J. Philipp Benz aff001
Působiště autorů: Wood Research Munich, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany aff001;  Faculty of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, Munich-Großhadern, Germany aff002;  Nitrochemie Aschau GmbH, Aschau am Inn, Germany aff003
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0219650

Souhrn

Early industrialization and the development of cheap production processes for paper have led to an exponential accumulation of paper-based documents during the last two centuries. Archives and libraries harbor vast amounts of ancient and modern documents and have to undertake extensive endeavors to protect them from abiotic and biotic deterioration. While services for mechanical preservation such as ex post de-acidification of historic documents are already commercially available, the possibilities for long-term protection of paper-based documents against fungal attack (apart from temperature and humidity control) are very limited. Novel processes for mechanical enhancement of damaged cellulosic documents use Ionic Liquids (IL) as essential process components. With some of these ILs having azole-functionalities similar to well-known fungicides such as Clotrimazole, the possibility of antifungal activities of these ILs was proposed but has not yet been experimentally confirmed. We evaluated the potency of four ILs with potential application in paper restoration for suppression of fungal growth on five relevant paper-infesting molds. The results revealed a general antifungal activity of all ILs, which increased with the size of the non-polar group. Physiological experiments and ultimate elemental analysis allowed to determine the minimal inhibitory concentration of each IL as well as the residual IL concentration in process-treated paper. These results provide valuable guidelines for IL-applications in paper restoration processes with antifungal activity as an added benefit. With azoles remaining in the paper after the process, simultaneous repair and biotic protection in treated documents could be facilitated.

Klíčová slova:

Medicine and health sciences – Pharmacology – Drugs – Antifungals – Biology and life sciences – Microbiology – Microbial control – Antimicrobials – Microbial physiology – Microbial growth and development – Fungal growth – Mycology – Fungal reproduction – Fungal spores – Organisms – Eukaryota – Fungi – Fungal molds – Aspergillus – Developmental biology – Physical sciences – Chemistry – Chemical compounds – Organic compounds – Cellulose – Organic chemistry – Research and analysis methods – Research facilities – Information centers – Archives – Libraries


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