Document Detail


Adsorption and Dilational Rheology of Mixed ß-Casein/DoTAB Layers Formed by Sequential and Simultaneous Adsorption at the Water/Hexane Interface.
MedLine Citation:
PMID:  23347396     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The interfacial behavior of ß-casein (ßCS) has been investigated in presence of the cationic surfactant dodecyl trimethyl ammonium bromide (DoTAB) at the water/hexane interface and compared to that obtained at the water/air interface. The used experimental technique is a drop profile analysis tensiometer specially equipped with a coaxial double capillary, which allows investigation of sequential adsorption of individual components besides the traditional simultaneous adsorption of two species. This method also provides the dilational rheological measurements, based on low frequency harmonic drop oscillations. The tensiometric results show that the equilibrium states of the mixed ßCS/DoTAB layers built up on the two different routes do not differ significantly, i.e., the general compositions of the mixed layers are similar. However, the results of dilational rheology for the two adsorption strategies are remarkably different, indicating different dynamic characteristics of the adsorbed layers. These findings suggest that the respective mixed layers are more protein-like if they are formed via sequential adsorption and more surfactant-like after simultaneous adsorption. In contrast to the W/A interface, at the W/H interface proteins remain at the interface once adsorbed and cannot be displaced just by competitive adsorption of surfactants.
Authors:
Abhijit Dan; Rainer Wüstneck; Jürgen Krägel; Eugene V Aksenenko; Valentin B Fainerman; Reinhard Miller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-24
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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