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In the present work we have studied the static (film structure and elasticity) and dynamic characteristics (surface dilatational properties) of β-lactoglobulin (βLG) monolayers spread at the air-water interface in the presence of polysaccharides in the aqueous phase, at 20°C and at pH 7. The measurements were performed on a fully automated Wilhelmy-type film balance. As polysaccharides with interfacial activity we have used propylene glycol alginates (PGA). To evaluate the effect of the degree of PGA esterification and viscosity, different commercial samples were studied-kelcoloid O (KO), kelcoloid LVF (KLVF) and manucol ester (MAN). Xanthan gum (XG) and λ-carrageenan (λC) were studied as non-surface active polysaccharides. The results reveal a significant effect of surface active and non-surface active polysaccharides on static - when the polysaccharide was added in the subphase the π-A isotherms shifted to higher surface pressure values as the time increased-and dynamic - the presence of polysaccharide in the aqueous phase decreased the surface dilatational modulus of a pure β-lactoglobulin monolayer-characteristics of β-lactoglobulin monolayers. To explain the observed effects three phenomena were taken into account: (i) the ability of the polysaccharide to adsorb at the interface by it-self and to increase the surface pressure, (ii) the interfacial complexation of the polysaccharide with the adsorbed protein and (iii) the existence of a limited thermodynamic compatibility between the protein and polysaccharide, depending on the protein-polysaccharide system. © 2004 Elsevier Ltd. All rights reserved.


Documento: Artículo
Título:Interactions of polysaccharides with β-lactoglobulin spread monolayers at the air-water interface
Autor:Baeza, R.; Carrera Sanchez, C.; Pilosof, A.M.R.; Rodríguez Patino, J.M.
Filiación:Departamento de Industrias, Fac. de Ciencias Exactas Y Naturales, Univ. de Buenos Aires, Cd. Univ., Buenos Aires, Argentina
Depto. de Ing. Química, Facultad de Química, Univ. Sevilla, C/. Prof. Garcia G., Sevilla, Spain
Palabras clave:Air-water interface; Gums; Hydrocolloid; Interfacial rheology; Monolayer; Polysaccharide; Protein; Surface tension; alginic acid propylene glycol ester; beta lactoglobulin; carrageenan; polysaccharide; xanthan; adsorption; aqueous solution; article; esterification; evaluation; film; flow kinetics; isotherm; molecular dynamics; molecular interaction; surface property; thermodynamics; viscoelasticity
Página de inicio:959
Página de fin:966
Título revista:Food Hydrocolloids
Título revista abreviado:Food Hydrocolloids
CAS:beta lactoglobulin, 9045-23-2; carrageenan, 9000-07-1, 9049-05-2, 9061-82-9, 9064-57-7; xanthan, 11138-66-2


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---------- APA ----------
Baeza, R., Carrera Sanchez, C., Pilosof, A.M.R. & Rodríguez Patino, J.M. (2004) . Interactions of polysaccharides with β-lactoglobulin spread monolayers at the air-water interface. Food Hydrocolloids, 18(6), 959-966.
---------- CHICAGO ----------
Baeza, R., Carrera Sanchez, C., Pilosof, A.M.R., Rodríguez Patino, J.M. "Interactions of polysaccharides with β-lactoglobulin spread monolayers at the air-water interface" . Food Hydrocolloids 18, no. 6 (2004) : 959-966.
---------- MLA ----------
Baeza, R., Carrera Sanchez, C., Pilosof, A.M.R., Rodríguez Patino, J.M. "Interactions of polysaccharides with β-lactoglobulin spread monolayers at the air-water interface" . Food Hydrocolloids, vol. 18, no. 6, 2004, pp. 959-966.
---------- VANCOUVER ----------
Baeza, R., Carrera Sanchez, C., Pilosof, A.M.R., Rodríguez Patino, J.M. Interactions of polysaccharides with β-lactoglobulin spread monolayers at the air-water interface. Food Hydrocolloids. 2004;18(6):959-966.