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Formulation of controlled size PUFA-loaded oil-in-water emulsions by microchannel emulsification using β-carotene-rich palm oil / Marcos A. Neves in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6405–6411 Titre : Formulation of controlled size PUFA-loaded oil-in-water emulsions by microchannel emulsification using β-carotene-rich palm oil Type de document : texte imprimé Auteurs : Marcos A. Neves, Auteur ; Henelyta S. Ribeiro, Auteur ; Katerina B. Fujiu, Auteur Année de publication : 2008 Article en page(s) : p. 6405–6411 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Polyunsaturated  fatty  acids  Oil-in-water  emulsions  Palm  oil  Microchannel  emulsification Résumé : The purpose of this research was to produce size-controlled polyunsaturated fatty acids (PUFA)-loaded oil-in-water (O/W) emulsions using refined palm oil rich in β-carotene, by microchannel (MC) emulsification. A commercial mixture of long-chain PUFA extracted from Menhaden oil was added to palm oil at a concentration of 45 g/L and used as the to-be-dispersed phase. The continuous phase consisted of a water dispersion of two different emulsifiers, in order to improve droplet stabilization and β-carotene bioavailability: sucrose laurate and β-lactoglobulin (1 wt %, respectively). The effect of various levels of to-be-dispersed phase flux (Jd) (10, 20, 40, and 80 L/(m2·h)) and continuous phase flow velocity (V̅c) (ranging from 0.23 to 2.33 mm/s) on the behavior of droplet formation, average droplet size (dav) and coefficient of variation (CV) were evaluated. The fine carotenoid O/W emulsions loaded with PUFA were prepared using an MC emulsification device. Protein-stabilized monodispersed PUFA-loaded emulsions were successfully produced, with a dav of 27.9 μm and a CV of less than 4%. The dav and CV increased with Jd especially above 40 L/(m2·h), and were independent of V̅c, within the velocity range applied in this study. Analysis of the dimensionless Ca indicated that on increasing the Jd up to the critical Ca (0.075), the flow is based on spontaneous transformation, resulting in monodispersed droplets. If Ca exceeds the critical value, viscous force is dominant, the flow is similar to laminar flow, and the to-be-dispersed phase flows out continuously from the MC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071552u [article] Formulation of controlled size PUFA-loaded oil-in-water emulsions by microchannel emulsification using β-carotene-rich palm oil [texte imprimé] / Marcos A. Neves, Auteur ; Henelyta S. Ribeiro, Auteur ; Katerina B. Fujiu, Auteur . - 2008 . - p. 6405–6411. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6405–6411 Mots-clés : Polyunsaturated  fatty  acids  Oil-in-water  emulsions  Palm  oil  Microchannel  emulsification Résumé : The purpose of this research was to produce size-controlled polyunsaturated fatty acids (PUFA)-loaded oil-in-water (O/W) emulsions using refined palm oil rich in β-carotene, by microchannel (MC) emulsification. A commercial mixture of long-chain PUFA extracted from Menhaden oil was added to palm oil at a concentration of 45 g/L and used as the to-be-dispersed phase. The continuous phase consisted of a water dispersion of two different emulsifiers, in order to improve droplet stabilization and β-carotene bioavailability: sucrose laurate and β-lactoglobulin (1 wt %, respectively). The effect of various levels of to-be-dispersed phase flux (Jd) (10, 20, 40, and 80 L/(m2·h)) and continuous phase flow velocity (V̅c) (ranging from 0.23 to 2.33 mm/s) on the behavior of droplet formation, average droplet size (dav) and coefficient of variation (CV) were evaluated. The fine carotenoid O/W emulsions loaded with PUFA were prepared using an MC emulsification device. Protein-stabilized monodispersed PUFA-loaded emulsions were successfully produced, with a dav of 27.9 μm and a CV of less than 4%. The dav and CV increased with Jd especially above 40 L/(m2·h), and were independent of V̅c, within the velocity range applied in this study. Analysis of the dimensionless Ca indicated that on increasing the Jd up to the critical Ca (0.075), the flow is based on spontaneous transformation, resulting in monodispersed droplets. If Ca exceeds the critical value, viscous force is dominant, the flow is similar to laminar flow, and the to-be-dispersed phase flows out continuously from the MC. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071552u

Generation of geometrically confined droplets using microchannel arrays / Isao Kobayashi in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8848–8855 Titre : Generation of geometrically confined droplets using microchannel arrays : effects of channel and step structure Type de document : texte imprimé Auteurs : Isao Kobayashi, Auteur ; Marcos A. Neves, Auteur ; Tomoyuki Yokota, Auteur Année de publication : 2009 Article en page(s) : pp. 8848–8855 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Geometrically  confined  droplets  Microchannel  arrays Résumé : The aim of this study was to investigate the generation characteristics of geometrically confined droplets using microchannel (MC) arrays made of single crystal silicon. Twelve MC array devices, each consisting of four MC arrays, were used in this study. Each MC array consists of rectangular MCs (5 μm in height) with or without a step. This study focused on the effects of the MC width and step height. Refined soybean oil was used as a dispersed phase, and a Milli-Q water solution containing 1.0 wt % sucrose monolaurate was used as a continuous phase. When rectangular MCs with a step height of 4.8 μm were used, geometrically confined droplets with a height of 9.8 μm were obtained, and their diameter and volume gradually increased with increasing MC width. In particular, highly uniform discoid droplets with coefficients of variation below 4% were obtained using the rectangular MCs with an appropriate width range. In contrast, droplets could not be generated from rectangular MCs without a step. When rectangular MCs with a width of 27.6 μm were used, the step height affected the resultant droplet shape. Highly uniform discoid droplets were generated via rectangular MCs with step heights below a critical value of ∼13 μm. Further increase in the step height resulted in the generation of highly uniform spherical droplets. The volume of the discoid droplets was somewhat larger than that of the spherical droplets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018998 [article] Generation of geometrically confined droplets using microchannel arrays : effects of channel and step structure [texte imprimé] / Isao Kobayashi, Auteur ; Marcos A. Neves, Auteur ; Tomoyuki Yokota, Auteur . - 2009 . - pp. 8848–8855. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8848–8855 Mots-clés : Geometrically  confined  droplets  Microchannel  arrays Résumé : The aim of this study was to investigate the generation characteristics of geometrically confined droplets using microchannel (MC) arrays made of single crystal silicon. Twelve MC array devices, each consisting of four MC arrays, were used in this study. Each MC array consists of rectangular MCs (5 μm in height) with or without a step. This study focused on the effects of the MC width and step height. Refined soybean oil was used as a dispersed phase, and a Milli-Q water solution containing 1.0 wt % sucrose monolaurate was used as a continuous phase. When rectangular MCs with a step height of 4.8 μm were used, geometrically confined droplets with a height of 9.8 μm were obtained, and their diameter and volume gradually increased with increasing MC width. In particular, highly uniform discoid droplets with coefficients of variation below 4% were obtained using the rectangular MCs with an appropriate width range. In contrast, droplets could not be generated from rectangular MCs without a step. When rectangular MCs with a width of 27.6 μm were used, the step height affected the resultant droplet shape. Highly uniform discoid droplets were generated via rectangular MCs with step heights below a critical value of ∼13 μm. Further increase in the step height resulted in the generation of highly uniform spherical droplets. The volume of the discoid droplets was somewhat larger than that of the spherical droplets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8018998