[article]
| Titre : |
A comparison between silicone-free and silicone-based emulsions : Technological features and in vivo evaluation |
| Type de document : |
document électronique |
| Auteurs : |
Antonia Mancuso, Auteur ; Martine Tarsitano, Auteur ; Betty P. Udongo, Auteur ; Maria Chiara Cristiano, Auteur ; Daniele Torella, Auteur ; Donatella Paolino, Auteur ; Massimo Fresta, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 514-529 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse sensorielle
Caractérisation
Emulsions -- Emploi en cosmétologie
Emulsions -- Stabilité
Etude in vivo
Granulométrie
Rhéologie
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Tests de sécurité
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
- Objective : Nowadays, the use of silicones in cosmetic formulation is still controversial, given that “natural” or “biodegradable” components are preferred. Often, the exclusion and/or the discrimination of these excipients from cosmetic field are unmotivated because all things cannot be painted with the same brush. Hence, we want to bring to light and underline the advantages of including silicones in cosmetic emulsions, refuting and debunking some myths related to their use.
- Methods : Silicone-free and silicone-based emulsions were obtained within an easy homogenization process. Droplet size distribution was assessed by laser diffraction particle size analyser Mastersizer 2000™, and by optical microscopy. The long-time stability profiles were investigated thanks to the optical analyser Turbiscan® Lab Expert. Diffusing wave spectroscopy (DWS) by Rheolaser Master™ and frequency sweep measurements by Kinexus® Pro Rotational Rheometer were carried out to assess a full rheological characterization. In vivo studies were carried out by the evaluation of Trans Epidermal Water Loss (TEWL) over time on healthy human volunteers. A skin feeling rating was collected from the same volunteers by questionnaire.
- Results : From size distribution analysis, a better coherence of data appeared for silicone-based emulsion, as the size of the droplets was kept unchanged after 1 month, as well as the uniformity parameter. Morphological investigation confirmed a homogenous droplet distribution for both samples. Silicones enhanced the viscosity, compactness and strength of the cream, providing a suitable stability profile both at room temperature and when heated at 40°C. The solid-like viscoelastic behaviour was assessed in the presence of dynamic oscillatory stresses. The monitoring of TEWL over time demonstrated non-occlusive properties of emulsions containing silicones, the values of which were comparable to the negative control. Silicone-based emulsions gained higher scores from the volunteers in silkiness, freshness and softness features, while lower scores were obtained in greasiness compared to silicone-free emulsions. No cases of irritation were recorded by the candidates.
- Conclusion : The presence of specific silicones inside a cosmetic product improved its technological characteristics. The rheological identity and the stability feature showed the real suitability of prepared emulsion as a cosmetic product. Moreover, this study demonstrated that silicone-based emulsions are safe for the skin and did not cause skin occlusion. Improved skin sensations are registered by potential consumers when silicones are included in the formulation. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Preparation of oil-in-water (O/W) emulsions - Size distribution - Optical microscopy - Diffusing wave spectroscopy (DWS) - Dynamic rheology studies - Stability studies - In vivo trans epidermal water loss (TEWL) evaluation - Skin feeling - Statistical analysis
- RESULTS AND DISCUSSION : Physicochemical characterization of emulsions - In vivo evaluation of emulsions’ effects on skin
- Table 1 : Composition in weight percentage (wt %) of two types of O/W emulsions
- Table 2 : Parameters recorded by MasterSizer 2000™ affecting the size distribution of samples |
| DOI : |
https://doi.org/10.1111/ics.12800 |
| En ligne : |
https://drive.google.com/file/d/1TfUrwdk7z2rjooOUVAqqmoDxqRAVr0X4/view?usp=shari [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38150 |
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 44, N° 5 (10/2022) . - p. 514-529
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A comparison between silicone-free and silicone-based emulsions : Technological features and in vivo evaluation in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 44, N° 5 (10/2022)
