Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization

The aim of this study was to investigate the rheological properties and storage stability of submicron O/W emulsions formulated with dried skim milk and vegetable oil at neutral pH, and to analyse the impact of their inclusion into starch suspension. Sunflower oil droplets were pre-emulsified in ski...

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Autores principales:	Alfano, E.H., Crosta, T., Martinez, M.J., Pérez, O.E., Farías, M.E.
Formato:	JOUR
Materias:	Frequency sweep Mixed colloidal suspension Modified starch Steady flow Submicron emulsions
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0268005X_v67_n_p120_Alfano
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0268005X_v67_n_p120_Alfano
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spelling	todo:paper_0268005X_v67_n_p120_Alfano2023-10-03T15:13:50Z Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization Alfano, E.H. Crosta, T. Martinez, M.J. Pérez, O.E. Farías, M.E. Frequency sweep Mixed colloidal suspension Modified starch Steady flow Submicron emulsions The aim of this study was to investigate the rheological properties and storage stability of submicron O/W emulsions formulated with dried skim milk and vegetable oil at neutral pH, and to analyse the impact of their inclusion into starch suspension. Sunflower oil droplets were pre-emulsified in skim milk suspension by a rotor-stator homogenizer and further an ultrasonic treatment was applied. Droplets sizes decreased after applying ultrasound (US) from 1.4 to 0.4 μm (d32). Emulsions exhibited Bingham flow behaviour and the plastic viscosity increased upon 14 days of storage at 5 °C. Flocculation may be responsible for the increase in viscosity with aging time. Mixed colloidal dispersions (submicron emulsions embedded into starch matrix) showed shear-thinning behaviour. Over storage, light microscope micrographs suggested deposited droplets on the starch granules surface. Flow and viscoelastic behaviour of mixed colloidal dispersions indicated droplets flocculation, attributable to a reversible depletion mechanism of destabilization. © 2016 Elsevier Ltd Fil:Martinez, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pérez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Farías, M.E. 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_v67_n_p120_Alfano
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Frequency sweep Mixed colloidal suspension Modified starch Steady flow Submicron emulsions
spellingShingle	Frequency sweep Mixed colloidal suspension Modified starch Steady flow Submicron emulsions Alfano, E.H. Crosta, T. Martinez, M.J. Pérez, O.E. Farías, M.E. Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
topic_facet	Frequency sweep Mixed colloidal suspension Modified starch Steady flow Submicron emulsions
description	The aim of this study was to investigate the rheological properties and storage stability of submicron O/W emulsions formulated with dried skim milk and vegetable oil at neutral pH, and to analyse the impact of their inclusion into starch suspension. Sunflower oil droplets were pre-emulsified in skim milk suspension by a rotor-stator homogenizer and further an ultrasonic treatment was applied. Droplets sizes decreased after applying ultrasound (US) from 1.4 to 0.4 μm (d32). Emulsions exhibited Bingham flow behaviour and the plastic viscosity increased upon 14 days of storage at 5 °C. Flocculation may be responsible for the increase in viscosity with aging time. Mixed colloidal dispersions (submicron emulsions embedded into starch matrix) showed shear-thinning behaviour. Over storage, light microscope micrographs suggested deposited droplets on the starch granules surface. Flow and viscoelastic behaviour of mixed colloidal dispersions indicated droplets flocculation, attributable to a reversible depletion mechanism of destabilization. © 2016 Elsevier Ltd
format	JOUR
author	Alfano, E.H. Crosta, T. Martinez, M.J. Pérez, O.E. Farías, M.E.
author_facet	Alfano, E.H. Crosta, T. Martinez, M.J. Pérez, O.E. Farías, M.E.
author_sort	Alfano, E.H.
title	Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
title_short	Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
title_full	Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
title_fullStr	Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
title_full_unstemmed	Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization
title_sort	submicron o/w emulsions embedded into modified waxy maize starch based matrix: rheological and microstructural characterization
url	http://hdl.handle.net/20.500.12110/paper_0268005X_v67_n_p120_Alfano
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Submicron O/W emulsions embedded into modified waxy maize starch based matrix: Rheological and microstructural characterization

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