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Journal of Dispersion Science and Technology Volume 39, 2018 - Issue 11
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Original Articles

Effect of emulsifier HLB and stabilizer addition on the physical stability of thyme essential oil emulsions

M. Jose MartinDepartamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, Spain
,
Luis A. TrujilloDepartamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, Spain
,
M. Carmen GarciaDepartamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, Spain
,
M. Carmen AlfaroDepartamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, SpainCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0002-0110-2290
ORCID Icon &
Jose MuñozDepartamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Sevilla, Spain
Pages 1627-1634 | Received 13 Jan 2018, Accepted 24 Mar 2018, Published online: 19 Apr 2018
 
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ABSTRACT

The objective of this work was to formulate and to further improve the stability of emulsions based on thyme essential oil. Several nonionic surfactants of different nature and with different hydrophilic−lipophilic balance (HLB) values were investigated. The surfactant with optimal HLB found for the thyme essential oil was Appyclean 6548 (HLB: 9-9.5). Afterwards, stabilizing biopolymers were added in order to improve emulsion stability. Properties of emulsions were evaluated in terms of droplet size and physical stability. Thyme essential oil/W emulsions formulated with a new biodegradable emulsifier (alkyl polypentoside) and welan gum as stabilizer were obtained with high shelf-life.

GRAPHICAL ABSTRACT

Acknowledgements

The financial support received (Project CTQ2015-70700-P) from the Spanish Ministerio de Economía y Competitividad and from the European Commission (FEDER Programme) is kindly acknowledged.

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