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dc.contributor.author
Bergfreund, Jotam
dc.contributor.author
Bertsch, Pascal
dc.contributor.author
Kuster, Simon
dc.contributor.author
Fischer, Peter Alfons
dc.date.accessioned
2019-04-10T11:22:11Z
dc.date.available
2019-01-19T11:49:48Z
dc.date.available
2019-04-10T11:22:11Z
dc.date.issued
2018-06-12
dc.identifier.uri
http://hdl.handle.net/20.500.11850/317588
dc.description.abstract
The rheological behavior of protein layers at water-oil interfaces is critical to understand and predict emulsion formation and stability. Effects of ionic strength, pH, temperature and several pre-treatments are well-known. However, the oil phase has been regarded as exchangeable and its role in the protein adsorption mechanisms has been widely ignored. By measuring adsorption kinetic, dilatational and interfacial shear moduli, the influence of systematically selected oil interfaces of high purity on the formation and properties of beta-lactoglobulin layers was evaluated. A delayed protein solution injection enabled the measurement of the viscoelastic response of protein layer formation at an uncontaminated water-oil interface. It was found that depending on molecular size, flexibility, hydrophobicity, and polarizability of the oils, globular proteins adsorb distinctively. Stronger interactions of polar oils with the hydrophilic exterior of the native beta-lactoglobulin lead to a decelerated protein unfolding. This results in lower surface pressures and slower formation of viscoelastic networks. In addition, polar oils interact stronger with the protein network by hydrophilic bonding and thereby act as softening agents. The found effects of hydrophobic subphases on the adsorbed protein layers provide knowledge, which promotes higher reproducibility in rheological studies and precise tailoring of interfacial films for an enhanced formation and stability of emulsions.
en_US
dc.language.iso
en
en_US
dc.title
Effect of oil hydrophobicity on adsorption and rheology of protein adsorption layers at oil-water interfaces
en_US
dc.type
Other Conference Item
ethz.pages.start
ORG8-01
en_US
ethz.event
7th Pacific Rim Conference on Rheology (PRCR 2018)
en_US
ethz.event.location
Jeju Island, South Korea
en_US
ethz.event.date
June 10-15, 2018
en_US
ethz.notes
Conference held on June 12, 2018
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02701 - Inst.f. Lebensmittelwiss.,Ernährung,Ges. / Institute of Food, Nutrition, and Health::03345 - Windhab, Erich Josef / Windhab, Erich Josef::08821 - Fischer, Peter (Tit.-Prof.)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02701 - Inst.f. Lebensmittelwiss.,Ernährung,Ges. / Institute of Food, Nutrition, and Health::03345 - Windhab, Erich Josef / Windhab, Erich Josef::08821 - Fischer, Peter (Tit.-Prof.)
en_US
ethz.date.deposited
2019-01-19T11:50:01Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2019-04-10T11:22:35Z
ethz.rosetta.lastUpdated
2019-04-10T11:22:35Z
ethz.rosetta.versionExported
true
ethz.COinS
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