Aging mechanisms of oil-in-water emulsions based on a bioemulsifier produced by Yarrowia lipolytica
authors Trindade, JR; Freire, MG; Amaral, PFF; Coelho, MAZ; Coutinho, JAP; Marrucho, IM
nationality International
journal COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
author keywords emulsion stability; aging mechanisms; Yarrowia lipolytica; Yansan; Gum Arabic
keywords CANDIDA-LIPOLYTICA; EMULSIFYING ACTIVITY; ALASAN; REMEDIATION; SURFACTANTS; EMULSAN; PROTEIN
abstract The aging mechanisms of oil-in-water emulsions prepared with Yansan, a bioemulsifier produced by a Brazilian wild strain of Yarrowia lipolytica, IMUFRJ 50682, in glucose-based fermentation medium, Were studied and compared with those prepared with Gum Arabic. Oil-in-water emulsions obtained by combining three different organic phases, perfluoro-n-hexane, n-hexadecane and toluene, with two aqueous buffers of different pH, and two bioemulsifiers, were Studied through the evolution of the mean droplet size. The emulsions were prepared by sonication and their droplet size distribution was followed for 60 days at 301 K using image analysis. The results indicate that the aging mechanisms of the studied emulsions depend mainly on the bioemulsifier and on the pH of the medium. It is shown that the emulsions containing Gum Arabic age by coalescence while Yansan-based emulsions change their aging mechanisms from coalescence at pH 3 to molecular diffusion at pH 7. (C) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0927-7757
year published 2008
volume 324
issue 1-3
beginning page 149
ending page 154
digital object identifier (doi) 10.1016/j.colsurfa.2008.04.009
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000257908600025
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