title: Formation and stability of foams made with sunflower (Helianthus annuus) proteins.
abstract: Foam properties of a sunflower isolate (SI), as well as those of helianthinin and sunflower albumins (SFAs), were studied at various pH values and ionic strengths and after heat treatment. Less foam could be formed from helianthinin than from SFAs, but foam prepared with helianthinin was more stable against Ostwald ripening and drainage than foam prepared with SFAs. Foams made with SFAs suffered from extensive coalescence. The formation and stability of foams made from reconstituted mixtures of both proteins and from SI showed the deteriorating effect of SFAs on foam stability. Foam stability against Ostwald ripening increased after acid and heat treatment of helianthinin. Partial unfolding of sunflower proteins, resulting in increased structural flexibility, improved protein performance at the air/water interface. Furthermore, it was observed that the protein available is used inefficiently and that typically only approximately 20% of the protein present is incorporated in the foam.
authors.affiliation: Agrotechnology and Food Innovations B.V., P.O. Box 17, 6700 AA Wageningen, The Netherlands.
authors.forename: Sergio
authors.initials: S
authors.lastname: González-Pérez
authors.forename: Johan M
authors.initials: JM
authors.lastname: Vereijken
authors.forename: Gerrit A
authors.initials: GA
authors.lastname: van Koningsveld
authors.forename: Harry
authors.initials: H
authors.lastname: Gruppen
authors.forename: Alphons G J
authors.initials: AG
authors.lastname: Voragen
mesh_terms: D000418:Albumins / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003064:Cnidarian Venoms / Q000737:chemistry; D004355:Drug Stability; D005524:Food Technology; D006368:Helianthus / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D010940:Plant Proteins / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*
chemical_list: D000418:Albumins; D003064:Cnidarian Venoms; D010940:Plant Proteins; C038137:cytolysin III (Stoichactis helianthus)