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Abstract:

The aim of this research is to quantify the competitive adsorption of a whey protein concentrate (WPC) and hydroxypropyl-methyl-cellulose (HPMC so called E4M, E50LV and F4M) at the air-water interface by means of dynamic surface tensiometry and Brewster angle microscopy (BAM). These biopolymers are often used together in many food applications. The concentration of both protein and HPMC, and the WPC/HPMC ratio in the aqueous bulk phase were variables, while pH (7), the ionic strength (0.05 M) and temperature (20 °C) were kept constant. The differences observed between mixed systems were in accordance with the relative bulk concentration of these biopolymers (CHPMC and CWPC) and the molecular structure of HPMC. At short adsorption times, the results show that under conditions where both WPC and HPMC could saturate the air-water interface on their own or when CHPMC ≥ CWPC, the polysaccharide dominates the surface. At concentrations where none of the biopolymers was able to saturate the interface, a synergistic behavior was observed for HPMC with lower surface activity (E50LV and F4M), while a competitive adsorption was observed for E4M (the HPMC with the highest surface activity). At long-term adsorption the rate of penetration controls the adsorption of mixed components. The results reflect complex competitive/synergistic phenomena under conditions of thermodynamic compatibility or in the presence of a "depletion mechanism". Finally, the order in which the different components reach the interface will influence the surface composition and the film properties. © 2009 Elsevier Inc. All rights reserved.

Registro:

Documento: Artículo
Título:Kinetics of adsorption of whey proteins and hydroxypropyl-methyl-cellulose mixtures at the air-water interface
Autor:Pérez, O.E.; Sánchez, C.C.; Pilosof, A.M.R.; Rodríguez Patino, J.M.
Filiación:Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, Prof. Garcia Gonzalez n 1, 41012 Sevilla, Spain
Palabras clave:Adsorption; Air-water interface; Competitive adsorption; Hydroxypropyl-methyl-cellulose; Milk protein; Polysaccharide; Surface pressure; Whey protein concentrate; Air-water interface; Competitive adsorption; Hydroxypropyl-methyl-cellulose; Milk protein; Surface pressure; Whey protein concentrate; Adsorption; Air; Biomolecules; Biopolymers; Cellulose; Dewatering; Ionic strength; Ionization of liquids; Polysaccharides; Phase interfaces; biopolymer; hydroxypropylmethylcellulose; milk protein; polysaccharide; water; adsorption kinetics; aqueous solution; article; Brewster angle microscopy; chemical composition; chemical structure; concentration (parameters); controlled study; food quality; ionic strength; pH; priority journal; quantitative analysis; surface tension; temperature; thermodynamics; Adsorption; Air; Kinetics; Methylcellulose; Milk Proteins; Surface Properties; Water; Adsorption; Air; Cellulose; Drainage; Ionization; Liquids; Milk; Polysaccharides; Proteins; Water
Año:2009
Volumen:336
Número:2
Página de inicio:485
Página de fin:496
DOI: http://dx.doi.org/10.1016/j.jcis.2009.04.011
Título revista:Journal of Colloid and Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
CAS:hydroxypropylmethylcellulose, 9004-65-3; water, 7732-18-5; Methylcellulose, 9004-67-5; Milk Proteins; Water, 7732-18-5; hypromellose, 8063-82-9; whey protein
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v336_n2_p485_Perez

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Citas:

---------- APA ----------
Pérez, O.E., Sánchez, C.C., Pilosof, A.M.R. & Rodríguez Patino, J.M. (2009) . Kinetics of adsorption of whey proteins and hydroxypropyl-methyl-cellulose mixtures at the air-water interface. Journal of Colloid and Interface Science, 336(2), 485-496.
http://dx.doi.org/10.1016/j.jcis.2009.04.011
---------- CHICAGO ----------
Pérez, O.E., Sánchez, C.C., Pilosof, A.M.R., Rodríguez Patino, J.M. "Kinetics of adsorption of whey proteins and hydroxypropyl-methyl-cellulose mixtures at the air-water interface" . Journal of Colloid and Interface Science 336, no. 2 (2009) : 485-496.
http://dx.doi.org/10.1016/j.jcis.2009.04.011
---------- MLA ----------
Pérez, O.E., Sánchez, C.C., Pilosof, A.M.R., Rodríguez Patino, J.M. "Kinetics of adsorption of whey proteins and hydroxypropyl-methyl-cellulose mixtures at the air-water interface" . Journal of Colloid and Interface Science, vol. 336, no. 2, 2009, pp. 485-496.
http://dx.doi.org/10.1016/j.jcis.2009.04.011
---------- VANCOUVER ----------
Pérez, O.E., Sánchez, C.C., Pilosof, A.M.R., Rodríguez Patino, J.M. Kinetics of adsorption of whey proteins and hydroxypropyl-methyl-cellulose mixtures at the air-water interface. J. Colloid Interface Sci. 2009;336(2):485-496.
http://dx.doi.org/10.1016/j.jcis.2009.04.011