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FEMS Microbiol Lett. 2016 Feb;363(3). pii: fnv231. doi: 10.1093/femsle/fnv231. Epub 2015 Dec 2.

Evaluation of antimicrobial properties of cork.

Author information

1
CBMA - Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, 4710-057 Braga, Portugal.
2
Amorim Cork Research and Services, 4535-907 S. Paio Oleiros, Portugal.
3
CITAB, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Minho, 4710-057 Braga, Portugal Department of Biology, School of Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal cristina.aguiar@bio.uminho.pt.

Abstract

Cork presents a range of diverse and versatile properties making this material suitable for several and extremely diverse industrial applications. Despite the wide uses of cork, its antimicrobial properties and potential applications have deserved little attention from industry and the scientific community. Thus, the main purpose of this work was the evaluation of the antibacterial properties of cork, by comparison with commercially available antimicrobial materials (Ethylene-Vinyl Acetate copolymer and a currently used antimicrobial commercial additive (ACA)), following the previous development and optimization of a method for such antimicrobial assay. The AATCC 100-2004 standard method, a quantitative procedure developed for the assessment of antimicrobial properties in textile materials, was used as reference and optimized to assess cork antibacterial activity. Cork displayed high antibacterial activity against Staphylococcus aureus, with a bacterial reduction of almost 100% (96.93%) after 90 minutes of incubation, similar to the one obtained with ACA. A more reduced but time-constant antibacterial action was observed against Escherichia coli (36% reduction of the initial number of bacterial colonies). To complement this study, antibacterial activity was further evaluated for a water extract of cork and an MIC of 6 mg mL(-1) was obtained against the reference strain S. aureus.

KEYWORDS:

antibacterial activity; antimicrobial assay; cork; cork sterilization; cork water extract; natural material

PMID:
26635416
DOI:
10.1093/femsle/fnv231
[Indexed for MEDLINE]

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