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Adsorption of hydrophobically modified anionic starch at oppositely charged oil/water interfaces

Nilsson, Lars LU and Bergenståhl, Björn LU orcid (2007) In Journal of Colloid and Interface Science 308(2). p.508-513
Abstract
In this paper we study the adsorption at cationic emulsion droplets of starch which had been hydrophobically modified with octenyl succinic anhydride (OSA), a modification which also renders the starch anionic. Emulsions were formed with didodecyldimethylammonium bromide (DDAB) after which the OSA-starch was added. The emulsions were separated by centrifugation and the surface load of OSA-starch was determined through serum depletion. The results show the adsorbed amounts can become very high, in some cases reaching approximately 40 mg/m(2). The surface load correlates positively with the surface charge density of the starch which depends on the degree of substitution, rms radius and molar mass. Furthermore, the surface load obtained... (More)
In this paper we study the adsorption at cationic emulsion droplets of starch which had been hydrophobically modified with octenyl succinic anhydride (OSA), a modification which also renders the starch anionic. Emulsions were formed with didodecyldimethylammonium bromide (DDAB) after which the OSA-starch was added. The emulsions were separated by centrifugation and the surface load of OSA-starch was determined through serum depletion. The results show the adsorbed amounts can become very high, in some cases reaching approximately 40 mg/m(2). The surface load correlates positively with the surface charge density of the starch which depends on the degree of substitution, rms radius and molar mass. Furthermore, the surface load obtained depends on the ratio between polymer surface charge density and the interface charge density which could be varied experimentally by combining various amounts of DDAB and dioleoyl phosphatidylcholine (DOPC) in the formation of the emulsion. The very high surface loads should correspond to very thick adsorbed layers. Thus, OSA-starch should be appropriate for encapsulation applications provided a suitable adhesion substance is employed. (c) 2007 Elsevier Inc. All rights reserved. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
polyelectrolytes, hydrophobically modified starch, encapsulation, octenyl succinic, anhydride starch, emulsions, adsorption
in
Journal of Colloid and Interface Science
volume
308
issue
2
pages
508 - 513
publisher
Academic Press
external identifiers
  • wos:000244841500028
  • scopus:33847196729
ISSN
1095-7103
DOI
10.1016/j.jcis.2007.01.024
project
CAP
language
English
LU publication?
yes
id
6786934b-08bc-4ef0-a8f1-6cbe33cc4565 (old id 670434)
date added to LUP
2016-04-01 12:21:07
date last changed
2025-01-02 14:54:50
@article{6786934b-08bc-4ef0-a8f1-6cbe33cc4565,
  abstract     = {{In this paper we study the adsorption at cationic emulsion droplets of starch which had been hydrophobically modified with octenyl succinic anhydride (OSA), a modification which also renders the starch anionic. Emulsions were formed with didodecyldimethylammonium bromide (DDAB) after which the OSA-starch was added. The emulsions were separated by centrifugation and the surface load of OSA-starch was determined through serum depletion. The results show the adsorbed amounts can become very high, in some cases reaching approximately 40 mg/m(2). The surface load correlates positively with the surface charge density of the starch which depends on the degree of substitution, rms radius and molar mass. Furthermore, the surface load obtained depends on the ratio between polymer surface charge density and the interface charge density which could be varied experimentally by combining various amounts of DDAB and dioleoyl phosphatidylcholine (DOPC) in the formation of the emulsion. The very high surface loads should correspond to very thick adsorbed layers. Thus, OSA-starch should be appropriate for encapsulation applications provided a suitable adhesion substance is employed. (c) 2007 Elsevier Inc. All rights reserved.}},
  author       = {{Nilsson, Lars and Bergenståhl, Björn}},
  issn         = {{1095-7103}},
  keywords     = {{polyelectrolytes; hydrophobically modified starch; encapsulation; octenyl succinic; anhydride starch; emulsions; adsorption}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{508--513}},
  publisher    = {{Academic Press}},
  series       = {{Journal of Colloid and Interface Science}},
  title        = {{Adsorption of hydrophobically modified anionic starch at oppositely charged oil/water interfaces}},
  url          = {{http://dx.doi.org/10.1016/j.jcis.2007.01.024}},
  doi          = {{10.1016/j.jcis.2007.01.024}},
  volume       = {{308}},
  year         = {{2007}},
}