Physical properties of emulsion-based hydroxypropyl methylcellulose films: Effect of their microstructure

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dc.contributor.authorZuniga, R. N.
dc.contributor.authorSkurtys, O.
dc.contributor.authorOsorio, F.
dc.contributor.authorAguilera, J. M.
dc.contributor.authorPedreschi, F.
dc.date.accessioned2024-01-10T13:16:15Z
dc.date.available2024-01-10T13:16:15Z
dc.date.issued2012
dc.description.abstractThe initial characteristics of emulsions and the rearrangement of the oil droplets in the film matrix during film drying, which defines its microstructure, has an important role in the physical properties of the emulsion-based films. The objective of this work was to study the effect of the microstructure (two droplet size distributions) and stability (with or without surfactant) of HPMC oil-in-water emulsions over physical properties of HPMC emulsion-based edible films. HPMC was used to prepare sunflower oil-in-water emulsions containing 0.3 or 1.0% (w/w) of oil with or without SOS, as surfactant, using an ultrasonic homogenizer. Microstructure, rheological properties and stability of emulsions (creaming) were measured. In addition, microstructure, coalescence of oil droplets, surface free energy, optical and mechanical properties and water vapor transfer of HPMC films were evaluated. Image analysis did not show differences among droplet size distributions of emulsions prepared at different oil contents: however, by using SOS the droplet size distributions were shifted to lower values. Volume mean diameters were 3.79 and 3.77 mu m for emulsions containing 0.3 and 1.0% without surfactant, respectively, and 2.72 and 2.71 mu m for emulsions with SOS. Emulsions formulated with 1.0% of oil presented higher stability, with almost no change during 5 and 3 days of storage, for emulsions with and without SOS, respectively. Internal and surface microstructure of emulsion-based films was influenced by the degree of coalescence and creaming of the oil droplets. No effect of microstructure over the surface free energy of films was found. The incorporation of oil impaired the optical properties of films due to light scattering of light. Addition of oil and SOS decreased the stress at break of the emulsion-based films. The replace of HPMC by oil and SOS produce a lower "amount" of network structure in the films, leading to a weakening of their structure. The oil content and SDS addition had an effect over the microstructure and physical properties of HPMC-based emulsions which lead to different microstructures during film formation. The way that oil droplets were structured into the film had an enormous influence over the physical properties of HPMC films. (C) 2012 Elsevier Ltd. All rights reserved.
dc.description.funderDIPEI of the Pontificia Universidad Catolica de Chile
dc.description.funderINNOVA CORFO project
dc.fechaingreso.objetodigital21-03-2024
dc.format.extent12 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.carbpol.2012.06.066
dc.identifier.eissn1879-1344
dc.identifier.issn0144-8617
dc.identifier.pubmedidMEDLINE:22840052
dc.identifier.urihttps://doi.org/10.1016/j.carbpol.2012.06.066
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78571
dc.identifier.wosidWOS:000307616500055
dc.information.autorucIngeniería;Aguilera J;S/I;99054
dc.information.autorucIngeniería;Pedreschi F;S/I;18770
dc.information.autorucIngeniería;Zuñiga R;S/I;158150
dc.issue.numero2
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final1158
dc.pagina.inicio1147
dc.publisherELSEVIER SCI LTD
dc.revistaCARBOHYDRATE POLYMERS
dc.rightsacceso restringido
dc.subjectEmulsion
dc.subjectEdible films
dc.subjectMicrostructure
dc.subjectDestabilization
dc.subjectPhysical properties
dc.subjectWATER-VAPOR PERMEABILITY
dc.subjectEDIBLE FILMS
dc.subjectSURFACE
dc.subjectLIPIDS
dc.titlePhysical properties of emulsion-based hydroxypropyl methylcellulose films: Effect of their microstructure
dc.typeartículo
dc.volumen90
sipa.codpersvinculados99054
sipa.codpersvinculados18770
sipa.codpersvinculados158150
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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