Interactions in the aqueous phase and adsorption at the air-water interface of caseinoglycomacropeptide (GMP) and β-lactoglobulin mixed systems
The aim of this work was to study the interactions and adsorption of caseinoglycomacropeptide (GMP) and GMP:β-lactoglobulin (β-lg) mixed system in the aqueous phase and at the air-water interface. The existence of associative interactions between GMP and β-lg in the aqueous phase was investigated by...
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2009
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09277765_v68_n1_p39_Martinez http://hdl.handle.net/20.500.12110/paper_09277765_v68_n1_p39_Martinez |
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| Sumario: | The aim of this work was to study the interactions and adsorption of caseinoglycomacropeptide (GMP) and GMP:β-lactoglobulin (β-lg) mixed system in the aqueous phase and at the air-water interface. The existence of associative interactions between GMP and β-lg in the aqueous phase was investigated by dynamic light scattering, differential scanning calorimetry (DSC), fluorometry and native PAGE-electrophoresis. The surface pressure isotherm and the static and dynamic surface pressure were determined by tensiometry and surface dilatational properties. The results showed that GMP presented higher surface activity than β-lg at a concentration of 4% wt but β-lg showed higher film forming ability. In the mixed systems β-lg dominated the static and dynamic surface pressure and the rheological properties of interfacial films suggesting that β-lg hinders GMP adsorption because, in simple competition, GMP should dominate because of its higher surface activity. The surface predominance of β-lg can be attributed to binding of GMP to β-lg in the aqueous phase that prevents GMP adsorption on its own. © 2008 Elsevier B.V. All rights reserved. |
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