NDLI: Engineering interfacial properties by anionic surfactant–chitosan complexes to improve stability of oil-in-water emulsions

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Food & Function Vol - 3 Issue - 2

Food & Function Vol -2

Food & Function Vol -1

Engineering interfacial properties by anionic surfactant–chitosan complexes to improve stability of oil-in-water emulsions

Content Provider	Royal Society of Chemistry (RSC)
Author	Biliaderis, Costas G. Zinoviadou, Kyriaki G. Moschakis, Thomas Scholten, Elke
Copyright Year	2012
Abstract	Oil-in-water emulsions (10% w/w n-tetradecane) were prepared at pH = 5.7 by using, as surface active agents, electrostatically formed complexes of sodium stearoyl lactylate (SSL) at a concentration of 0.4% (w/w) and chitosan (CH) in a concentration range between 0 and 0.48% w/w. The use of complexes in emulsions with a low concentration of CH (<0.24% w/w) resulted in highly flocculated systems; instead, with increased level of CH, the emulsions had a smaller average droplet size and exhibited greater stability during storage. Emulsions stabilised by SSL/CH complexes showed non-Newtonian flow behavior with pronounced shear thinning. Among all formulations studied none showed a gel-like behavior since in all cases the G′ (storage modulus) was lower that G′′ (loss modulus). Adsorption kinetics of pure SSL and SSL/CH complexes to the oil/water interfaces were evaluated using an automated drop tensiometer (ADT). Even though complexation of SSL with CH resulted in a delay of the adsorption of the surface active species at the oil/water interface, the inclusion of the polysaccharide resulted in substantially improved interfacial properties as indicated by a significant increase of the dilatational modulus. Furthermore, the enhanced interfacial properties of the emulsion droplets resulted in improved stability against freeze–thaw cycling. The results of this study may facilitate the development of frozen food products such as desserts with an ameliorated stability and favorable sensorial characteristics.
Starting Page	312
Ending Page	319
Page Count	8
File Format	HTM / HTML PDF
ISSN	20426496
Volume Number	3
Issue Number	3
Journal	Food & Function
DOI	10.1039/c2fo10197a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PH Sodium stearoyl lactylate Lactylate Chitosan Non-Newtonian fluid Shear thinning Adsorption Tensiometer (soil science) Polysaccharide Emulsion
Content Type	Text
Resource Type	Article
Subject	Medicine Food Science

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