Soy protein-polysaccharides interactions at the air-water interface

This work studies the interfacial behavior of mixed soy protein (SP) + polysaccharide (PS) systems to gain knowledge on the interactions between these biopolymers at the air-water interface under dynamic conditions at neutral pH where a limited incompatibility between macromolecules can occur. The P...

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Autores principales: Martinez, K.D., Carrera Sanchez, C., Pizones Ruiz-Henestrosa, V., Rodríguez Patino, J.M., Pilosof, A.M.R.
Formato: JOUR
Materias:
Dilatational rheology
Gums
Hydrocolloids
Interactions
Interface
Soy protein
Surface pressure
Glycine max
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0268005X_v21_n5-6_p804_Martinez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_0268005X_v21_n5-6_p804_Martinez2023-10-03T15:13:35Z Soy protein-polysaccharides interactions at the air-water interface Martinez, K.D. Carrera Sanchez, C. Pizones Ruiz-Henestrosa, V. Rodríguez Patino, J.M. Pilosof, A.M.R. Dilatational rheology Gums Hydrocolloids Interactions Interface Soy protein Surface pressure Glycine max This work studies the interfacial behavior of mixed soy protein (SP) + polysaccharide (PS) systems to gain knowledge on the interactions between these biopolymers at the air-water interface under dynamic conditions at neutral pH where a limited incompatibility between macromolecules can occur. The PSs used were: hydroxypropylmethylcellulose (HPMC) as surface-active PS; lambda carrageenan (λ C) and locust bean (LB) gum as non-surface-active PSs. Protein and PS concentration in the mixed systems were 2% and 0.25%, respectively. The dynamic surface pressure and rheological properties of films were evaluated with a drop tensiometer at 20 {ring operator} C, pH 7 and ionic strength 0.05 M. The presence of HPMC and λ C greatly increased the surface pressure, surface dilatational elasticity and relative viscoelasticity on the basis of different mechanisms. HPMC competed for the interface with SP, but due to its unusual strong surface activity it could dominate the surface pressure and improve film viscoelasticity. The modification of surface pressure and rheological properties of adsorbed SP films in the presence of λ C necessarily suggests the participation of λ C + contaminants at the interface. Pure λ C could influence the interface by a complexation mechanism, or indirectly by a depletion mechanism in the vicinity of the interface. In addition surface-active contaminant of λ C if strongly bound to the PS could bring some PS molecules at the interface. LB little affected the surface pressure and rheological properties of SP films even if surface-active contaminants were present in the commercial preparation. Differences in the interaction of λ C and LB gum with the protein should be mainly ascribed to different degrees of incompatibility and to the fact that LB is not charged. © 2006 Elsevier Ltd. All rights reserved. Fil:Martinez, K.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pilosof, A.M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0268005X_v21_n5-6_p804_Martinez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Dilatational rheology
Gums
Hydrocolloids
Interactions
Interface
Soy protein
Surface pressure
Glycine max
spellingShingle Dilatational rheology
Gums
Hydrocolloids
Interactions
Interface
Soy protein
Surface pressure
Glycine max
Martinez, K.D.
Carrera Sanchez, C.
Pizones Ruiz-Henestrosa, V.
Rodríguez Patino, J.M.
Pilosof, A.M.R.
Soy protein-polysaccharides interactions at the air-water interface
topic_facet Dilatational rheology
Gums
Hydrocolloids
Interactions
Interface
Soy protein
Surface pressure
Glycine max
description This work studies the interfacial behavior of mixed soy protein (SP) + polysaccharide (PS) systems to gain knowledge on the interactions between these biopolymers at the air-water interface under dynamic conditions at neutral pH where a limited incompatibility between macromolecules can occur. The PSs used were: hydroxypropylmethylcellulose (HPMC) as surface-active PS; lambda carrageenan (λ C) and locust bean (LB) gum as non-surface-active PSs. Protein and PS concentration in the mixed systems were 2% and 0.25%, respectively. The dynamic surface pressure and rheological properties of films were evaluated with a drop tensiometer at 20 {ring operator} C, pH 7 and ionic strength 0.05 M. The presence of HPMC and λ C greatly increased the surface pressure, surface dilatational elasticity and relative viscoelasticity on the basis of different mechanisms. HPMC competed for the interface with SP, but due to its unusual strong surface activity it could dominate the surface pressure and improve film viscoelasticity. The modification of surface pressure and rheological properties of adsorbed SP films in the presence of λ C necessarily suggests the participation of λ C + contaminants at the interface. Pure λ C could influence the interface by a complexation mechanism, or indirectly by a depletion mechanism in the vicinity of the interface. In addition surface-active contaminant of λ C if strongly bound to the PS could bring some PS molecules at the interface. LB little affected the surface pressure and rheological properties of SP films even if surface-active contaminants were present in the commercial preparation. Differences in the interaction of λ C and LB gum with the protein should be mainly ascribed to different degrees of incompatibility and to the fact that LB is not charged. © 2006 Elsevier Ltd. All rights reserved.
format JOUR
author Martinez, K.D.
Carrera Sanchez, C.
Pizones Ruiz-Henestrosa, V.
Rodríguez Patino, J.M.
Pilosof, A.M.R.
author_facet Martinez, K.D.
Carrera Sanchez, C.
Pizones Ruiz-Henestrosa, V.
Rodríguez Patino, J.M.
Pilosof, A.M.R.
author_sort Martinez, K.D.
title Soy protein-polysaccharides interactions at the air-water interface
title_short Soy protein-polysaccharides interactions at the air-water interface
title_full Soy protein-polysaccharides interactions at the air-water interface
title_fullStr Soy protein-polysaccharides interactions at the air-water interface
title_full_unstemmed Soy protein-polysaccharides interactions at the air-water interface
title_sort soy protein-polysaccharides interactions at the air-water interface
url http://hdl.handle.net/20.500.12110/paper_0268005X_v21_n5-6_p804_Martinez
work_keys_str_mv AT martinezkd soyproteinpolysaccharidesinteractionsattheairwaterinterface
AT carrerasanchezc soyproteinpolysaccharidesinteractionsattheairwaterinterface
AT pizonesruizhenestrosav soyproteinpolysaccharidesinteractionsattheairwaterinterface
AT rodriguezpatinojm soyproteinpolysaccharidesinteractionsattheairwaterinterface
AT pilosofamr soyproteinpolysaccharidesinteractionsattheairwaterinterface
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