Hydrophobically modified xanthan: Thickening and surface active agent for highly stable oil in water emulsions

•Alkyl grafted xanthan was used to stabilize oil in water emulsion.•Amphiphilic xanthan allows long term stability of emulsions.•Emulsion stability increases with increasing amphiphilic xanthan concentration.•Emulsion stability decreases with increasing grafting density.•The whole results open new r...

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Bibliographic Details
Published in:Carbohydrate polymers 2019-02, Vol.205, p.362-370
Main Authors: Fantou, Céline, Comesse, Sébastien, Renou, Frédéric, Grisel, Michel
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed Matter
Emulsion stability
Hydrophobically modified xanthan
Materials Science
Partitioning
Physics
Polymers
Soft Condensed Matter
Surface active
Surfactant free emulsion
Thickener
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Summary:•Alkyl grafted xanthan was used to stabilize oil in water emulsion.•Amphiphilic xanthan allows long term stability of emulsions.•Emulsion stability increases with increasing amphiphilic xanthan concentration.•Emulsion stability decreases with increasing grafting density.•The whole results open new routes for designing environmentally friendly formulations. Oil-in-water (O/W) emulsions were prepared using exclusively a hydrophobically modified xanthan (HMX) under ordered conformation without any surfactant. A series of HMX differing in grafting density were utilized at different concentrations. It was demonstrated that HMX stabilizes O/W emulsions where pristine xanthan do not. Indeed, in some cases, emulsions with HMX proved to be homogeneous and stable over months. Emulsions microstructure and rheological properties were investigated over time as a function of HMX concentration and grafting density in order to determine the mechanisms governing this efficient stability. The higher the HMX concentration is, the better the emulsions stability. However, unexpectedly, increasing the HMX grafting density leads to faster destabilization. The whole set of results demonstrate that the stability of the emulsions against coalescence and creaming is explained by partitioning of HMX molecules between bulk and interface, thus split between viscosifying the aqueous phase and stabilizing the interface.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2018.10.052