Change search
ReferencesLink to record
Permanent link

Direct link
Disruption of viscoelastic beta-lactoglobulin surface layers at the air-water interface by nonionic polymeric surfactants
KTH, Superseded Departments, Chemistry.
KTH, Superseded Departments, Chemistry.
Show others and affiliations
2004 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 20, no 23, 10150-10158 p.Article in journal (Refereed) Published
Abstract [en]

Nonequilibrium interfacial layers formed by competitive adsorption of beta-lactoglobulin and the nonionic triblock copolymer PEO99-PPO65-PEO99 (F127) to the air-water interface were investigated in order to explain the influence of polymeric surfactants on protein film surface rheology and foam stability. Surface dilatational and shear rheological methods, surface tension measurements, dynamic thin-film measurements, diffusion measurements (from fluorescence recovery after photo bleaching), and determinations of foam stability were used as methods. The high surface viscoelasticity, both the shear and dilatational, of the protein films was significantly reduced by coadsorption of polymeric surfactant. The drainage rate of single thin films, in the presence of P-lactoglobulin, increased with the amount of added F 127, but equilibrium F127 films were found to be thicker than beta-lactoglobulin films, even at low concentration of the polymeric surfactant. It is concluded that the effect of the nonionic triblock copolymer on the interfacial rheology of beta-lactoglobulin layers is similar to that of low molecular weight surfactants. They differ however in that F127 increases the thickness of thin liquid films. In addition, the significant destabilizing effect of low molecular weight surfactants on protein foams is not found in the investigated system. This is explained as due to long-range steric forces starting to stabilize the foam films at low concentrations of F127.

Place, publisher, year, edition, pages
2004. Vol. 20, no 23, 10150-10158 p.
Keyword [en]
thin liquid-films, aba triblock copolymers, sodium dodecyl-sulfate, air/water interface, block-copolymer, foam films, competitive adsorption, dilatational rheology, orogenic displacement, molecular-diffusion
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-23869DOI: 10.1021/la0485475ISI: 000224981600042ScopusID: 2-s2.0-9144255582OAI: diva2:342568
QC 20100525 QC 20110916Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-16Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Rippner Blomqvist, BritaWärnheim, TorbjörnClaesson, Per M.
By organisation
In the same journal
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 22 hits
ReferencesLink to record
Permanent link

Direct link