Birefringent emulsions stabilized with steareth-2 and steareth-21
In this research, birefringent emulsions stabilized with Steareth-2 and Steareth-21 were studied. Some authors attributed to them a liquid-crystalline structure, although the microphotographs presented by them as an evidence of such structure actually suggest the presence of solid crystals instead...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2008
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/7699 http://www.latamjpharm.org/trabajos/27/6/LAJOP_27_6_1_6_UL5VC891O5.pdf |
| Aporte de: |
| id |
I19-R120-10915-7699 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Farmacia birefringent emulsions; liquid crystalline emulsions; steareth-2; Steareth-21 Farmacología Bioquímica |
| spellingShingle |
Farmacia birefringent emulsions; liquid crystalline emulsions; steareth-2; Steareth-21 Farmacología Bioquímica Pasquali, Ricardo C. Taurozzi, Melina P. Sacco, Natalia Bregni, Carlos Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| topic_facet |
Farmacia birefringent emulsions; liquid crystalline emulsions; steareth-2; Steareth-21 Farmacología Bioquímica |
| description |
In this research, birefringent emulsions stabilized with Steareth-2 and Steareth-21 were
studied. Some authors attributed to them a liquid-crystalline structure, although the microphotographs
presented by them as an evidence of such structure actually suggest the presence of solid crystals instead
of liquid crystals. The purposes of this paper are to determine the true cause of the birefringence of this
type of emulsions and to study how the composition of the oily phase influences the stability and the birefringence.
Six emulsions stabilized with a mixture of Steareth-2 and Steareth-21 were prepared, each one
with a different emollient. Four of them were birefringent while two were isotropic. The observed birefringence
would be due to the presence of solid crystals and not of liquid-crystals. These solid crystals could be
originated by the interaction between both emulsifiers, either between themselves, with stearic acid or
cetyl alcohol presents in the formulations, or even because of the insolubility of stearic acid or cetyl alcohol
in emollient oil. Moreover, the isotropic emulsions showed greater viscosity than the birefringent ones.
This result is accorded to the fact that the birefringence is not related to the presence of a liquid-crystalline
interphase, because this type of interphase leads to an increase of viscosity. |
| format |
Articulo Articulo |
| author |
Pasquali, Ricardo C. Taurozzi, Melina P. Sacco, Natalia Bregni, Carlos |
| author_facet |
Pasquali, Ricardo C. Taurozzi, Melina P. Sacco, Natalia Bregni, Carlos |
| author_sort |
Pasquali, Ricardo C. |
| title |
Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| title_short |
Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| title_full |
Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| title_fullStr |
Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| title_full_unstemmed |
Birefringent emulsions stabilized with steareth-2 and steareth-21 |
| title_sort |
birefringent emulsions stabilized with steareth-2 and steareth-21 |
| publishDate |
2008 |
| url |
http://sedici.unlp.edu.ar/handle/10915/7699 http://www.latamjpharm.org/trabajos/27/6/LAJOP_27_6_1_6_UL5VC891O5.pdf |
| work_keys_str_mv |
AT pasqualiricardoc birefringentemulsionsstabilizedwithsteareth2andsteareth21 AT taurozzimelinap birefringentemulsionsstabilizedwithsteareth2andsteareth21 AT sacconatalia birefringentemulsionsstabilizedwithsteareth2andsteareth21 AT bregnicarlos birefringentemulsionsstabilizedwithsteareth2andsteareth21 |
| bdutipo_str |
Repositorios |
| _version_ |
1764820484891869185 |