Influence of surfactant charge on antimicrobial efficacy of surfactant-stabilized thyme oil nanoemulsions

Journal of Agricultural and Food Chemistry
Khalid ZianiDavid Julian McClements

Abstract

Thyme oil-in-water nanoemulsions stabilized by a nonionic surfactant (Tween 80, T80) were prepared as potential antimicrobial delivery systems (pH 4). The nanoemulsions were highly unstable to droplet growth and phase separation, which was attributed to Ostwald ripening due to the relatively high water solubility of thyme oil. Ostwald ripening could be inhibited by incorporating ≥75% of corn oil (a hydrophobic material with a low water solubility) into the nanoemulsion droplets. The electrical characteristics of the droplets in the nanoemulsions were varied by incorporating ionic surfactants with different charges after homogenization: a cationic surfactant (lauric arginate, LAE) or an anionic surfactant (sodium dodecyl sulfate, SDS). The antifungal activity of nanoemulsions containing positive, negative, or neutral thymol droplets was then conducted against four strains of acid-resistant spoilage yeasts: Zygosaccharomyces bailli, Saccharomyces cerevisiae, Brettanomyces bruxellensis, and Brettanomyces naardenensis. The antifungal properties of the three surfactants (T80, LAE, SDS) were also tested in the absence of thymol droplets. Both ionic surfactants showed strong antifungal activity in the absence of thymol droplets, but n...Continue Reading

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Citations

Mar 9, 1999·Trends in Microbiology·R E Silversmith, R B Bourret
Jul 4, 2012·Journal of Agricultural and Food Chemistry·Rong LiangQingrong Huang
Nov 13, 2012·Journal of Agricultural and Food Chemistry·Yuhua ChangDavid Julian McClements
Mar 12, 2013·Journal of Agricultural and Food Chemistry·Yue LiFang Zhong
Sep 4, 2013·Journal of Agricultural and Food Chemistry·Yuhua ChangDavid Julian McClements
Jan 10, 2014·Bulletin of Entomological Research·S SugumarN Chandrasekaran
Mar 12, 2016·Ultrasonics Sonochemistry·Vaiyapuri Subbarayan PeriasamyAli A Alshatwi
Oct 17, 2015·Food Chemistry·Roya MoghimiDavid Julian McClements
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