Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH
The emulsifying behavior of four different commercial types of hydroxypropylmethylcellulose (HPMC) was studied and correlated with the properties of the interfacial films. Emulsions resulted multimodal when made by a high speed blender (Ultraturrax, UT), with droplets higher than 10 μm. The average...
Guardado en:
Autores principales: | , |
---|---|
Publicado: |
2011
|
Materias: | |
Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v25_n5_p1051_Camino http://hdl.handle.net/20.500.12110/paper_0268005X_v25_n5_p1051_Camino |
Aporte de: |
id |
paper:paper_0268005X_v25_n5_p1051_Camino |
---|---|
record_format |
dspace |
spelling |
paper:paper_0268005X_v25_n5_p1051_Camino2023-06-08T15:23:49Z Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH Camino, Nerina Andrea Pilosof, Ana María Renata Emulsions High intensity ultrasound Hydroxypropylmethylcellulose Interface Stability The emulsifying behavior of four different commercial types of hydroxypropylmethylcellulose (HPMC) was studied and correlated with the properties of the interfacial films. Emulsions resulted multimodal when made by a high speed blender (Ultraturrax, UT), with droplets higher than 10 μm. The average diameters D32 resulted higher for UT emulsions stabilized by the higher molecular weight HPMC (E4M and E50LV). However, E4M emulsions presented the highest variation in D32 with pH. Emulsions made by high intensity ultrasound, presented a monomodal population with the majority of the droplets around 0.3 μm. In all cases, the droplets sizes were smaller than 0.5 μm. As for UT emulsions, higher average diameters (D32 and D43) were obtained for all HPMCs at pH3.Emulsions at pH3 destabilized quicker than emulsions at pH6, mainly when made by Ultraturrax. At pH3 hydrophobic interactions are impeded thus elastic films are not formed upon emulsification, resulting in droplets with higher initial diameters than at pH6. © 2010 Elsevier Ltd. Fil:Camino, N.A. 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. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v25_n5_p1051_Camino http://hdl.handle.net/20.500.12110/paper_0268005X_v25_n5_p1051_Camino |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Emulsions High intensity ultrasound Hydroxypropylmethylcellulose Interface Stability |
spellingShingle |
Emulsions High intensity ultrasound Hydroxypropylmethylcellulose Interface Stability Camino, Nerina Andrea Pilosof, Ana María Renata Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
topic_facet |
Emulsions High intensity ultrasound Hydroxypropylmethylcellulose Interface Stability |
description |
The emulsifying behavior of four different commercial types of hydroxypropylmethylcellulose (HPMC) was studied and correlated with the properties of the interfacial films. Emulsions resulted multimodal when made by a high speed blender (Ultraturrax, UT), with droplets higher than 10 μm. The average diameters D32 resulted higher for UT emulsions stabilized by the higher molecular weight HPMC (E4M and E50LV). However, E4M emulsions presented the highest variation in D32 with pH. Emulsions made by high intensity ultrasound, presented a monomodal population with the majority of the droplets around 0.3 μm. In all cases, the droplets sizes were smaller than 0.5 μm. As for UT emulsions, higher average diameters (D32 and D43) were obtained for all HPMCs at pH3.Emulsions at pH3 destabilized quicker than emulsions at pH6, mainly when made by Ultraturrax. At pH3 hydrophobic interactions are impeded thus elastic films are not formed upon emulsification, resulting in droplets with higher initial diameters than at pH6. © 2010 Elsevier Ltd. |
author |
Camino, Nerina Andrea Pilosof, Ana María Renata |
author_facet |
Camino, Nerina Andrea Pilosof, Ana María Renata |
author_sort |
Camino, Nerina Andrea |
title |
Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
title_short |
Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
title_full |
Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
title_fullStr |
Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
title_full_unstemmed |
Hydroxypropylmethylcellulose at the oil-water interface. Part II. Submicron-emulsions as affected by pH |
title_sort |
hydroxypropylmethylcellulose at the oil-water interface. part ii. submicron-emulsions as affected by ph |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v25_n5_p1051_Camino http://hdl.handle.net/20.500.12110/paper_0268005X_v25_n5_p1051_Camino |
work_keys_str_mv |
AT caminonerinaandrea hydroxypropylmethylcelluloseattheoilwaterinterfacepartiisubmicronemulsionsasaffectedbyph AT pilosofanamariarenata hydroxypropylmethylcelluloseattheoilwaterinterfacepartiisubmicronemulsionsasaffectedbyph |
_version_ |
1768545783154475008 |