Competitive adsorption of water soluble plasma proteins from egg yolk at the oil/water interface
Författare
Summary, in English
Water soluble plasma proteins were fractionated from hen's egg yolk, and the molecular weight and pI of the most abundant protein species were characterized with gel electrophoresis. The proteins were identified by mass spectrometry. The protein fraction was used to produce oil-in-water emulsions, both at various protein concentrations and at various pH values, and the surface load was determined through serum depletion. The competitive adsorption was studied through the determination of nonadsorbing species with gel electrophoresis. The results show that it was possible to form an oil-in-water emulsion for which droplet size and maximum surface load depended on the protein concentration and pH. Serum albumin and YGP40 adsorbed selectively at the oil/water interface throughout the pH range investigated, and for albumin the selectivity increased close to its pI. It is suggested that this selective adsorption is due to long hydrophobic stretches in the polypeptide chain, which are present in the selectively adsorbing species but absent in less adsorbing species.
Avdelning/ar
- Department of Food Technology, Engineering and Nutrition
- Molekylär endokrinologi
Publiceringsår
2006
Språk
Engelska
Sidor
6881-6887
Publikation/Tidskrift/Serie
Journal of Agricultural and Food Chemistry
Volym
54
Issue
18
Dokumenttyp
Artikel i tidskrift
Förlag
The American Chemical Society (ACS)
Ämne
- Agricultural Science, Forestry and Fisheries
Nyckelord
- competitive adsorption
- emulsion
- egg yolk proteins
- livetin
- interface
- oil/water
Status
Published
Forskningsgrupp
- Molecular Endocrinology
ISBN/ISSN/Övrigt
- ISSN: 0021-8561