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Physicochemical and Antimicrobial Properties of Citral and Quercetin Incorporated Kafirn-Based Bioactive Films

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Open access
Authors
Giteru, S.
Coorey, Ranil
Bertolatti, Dean
Watkin, Elizabeth
Johnson, Stuart
Fang, Zhongxiang
Date
2014
Type
Journal Article

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Giteru, S. and Coorey, R. and Bertolatti, D. and Watkin, E. and Johnson, S. and Fang, Z. 2014. Physicochemical and Antimicrobial Properties of Citral and Quercetin Incorporated Kafirn-Based Bioactive Films. Food Chemistry. 168: pp. 341-347.
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Food Australia
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School of Public Health
Remarks

NOTICE: this is the author’s version of a work that was accepted for publication in Food Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Food Chemistry, Vol. 168 (2014). DOI: 10.1016/j.foodchem.2014.07.077

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Abstract

The aim of this study was to determine the physicochemical and antimicrobial properties of kafirin-based bioactive films incorporating the plant essential oil citral and the polyphenol quercetin. The addition of quercetin and citral both imparted a yellowish colour to the films. The tensile strength of films significantly decreased and elongation at break increased when citral was incorporated, whereas addition of quercetin did not alter these two film parameters. The rate of water vapour transmission of the films decreased with citral incorporation but the water vapour permeability was not affected by either citral or quercetin incorporation. Furthermore, incorporation of citral and quercetin significantly lowered the oxygen permeability of the films. Film made of kafirin alone had antimicrobial activity against Listeria monocytogenes, however, films incorporating citral exhibited the highest antimicrobial activity against Campylobacter jejuni, L. monocytogenes, and Pseudomonas fluorescens. These results suggest that kafirin-based films incorporating citral and quercetin have potential as bioactive packaging to improve food safety and quality.