title: Physicochemical and antimicrobial properties of citral and quercetin incorporated kafirin-based bioactive films.
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.
authors.affiliation: School of Public Health, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
authors.forename: Stephen Gitonga
authors.initials: SG
authors.lastname: Giteru
authors.affiliation: School of Public Health, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
authors.forename: Ranil
authors.initials: R
authors.lastname: Coorey
authors.affiliation: School of Public Health, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
authors.forename: Dean
authors.initials: D
authors.lastname: Bertolatti
authors.affiliation: School of Biomedical Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Watkin
authors.affiliation: School of Public Health, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; International Institute of Agri-Food Security, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
authors.forename: Stuart
authors.initials: S
authors.lastname: Johnson
authors.affiliation: School of Public Health, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; International Institute of Agri-Food Security, Curtin University, GPO Box U1987, Perth, WA 6845, Australia. Electronic address: zhongxiang.fang@curtin.edu.au.
authors.forename: Zhongxiang
authors.initials: Z
authors.lastname: Fang
mesh_terms: D000080462:Acyclic Monoterpenes; D000890:Anti-Infective Agents / Q000494:pharmacology*; D018857:Food Packaging / Q000379:methods; D039821:Monoterpenes / Q000737:chemistry* / Q000494:pharmacology; D010539:Permeability; D010940:Plant Proteins / Q000737:chemistry*; D011794:Quercetin / Q000737:chemistry* / Q000494:pharmacology; D012995:Solubility; D013718:Tensile Strength
chemical_list: D000080462:Acyclic Monoterpenes; D000890:Anti-Infective Agents; D039821:Monoterpenes; D010940:Plant Proteins; C080615:kafirin protein, Sorghum bicolor; D011794:Quercetin; C007076:citral
keywords: Antimicrobial activity; Bioactive film; Citral; Kafirin; Quercetin