[article]
| Titre : |
Two factors governing transepidermal water loss : barrier and driving force components |
| Type de document : |
texte imprimé |
| Auteurs : |
Koji Endo, Auteur ; Noboru Suzuki, Auteur ; Osamu Yoshida, Auteur ; Hirayuki Sato, Auteur ; Teiji Kato, Auteur ; Yoshiaki Fujikura, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 9-13 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Peau
Perméabilité
Transfert de masse
Transpiration
Vapeur à haute pression
|
| Tags : |
Peau 'Fonction barrière' 'Perte d'eau transépidermique' Perméabilité 'Coefficient de transfert masse' 'Vapeur sous pression' |
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
A new method for separating the rates of transpidermal water loss (TEWL) into a barrier component and a driving force component was applied to human forearm skin in-vivo data. The rate of TEWL was measured with a ventilated chamber measurement system under different water vapor pressures. The apparent mass transfer coefficient of water, K, of the stratum corneum and the apparent water vapor pressure, Pd, at the interface between stratum corneum and underlying living cells of the epidermis were estimated using data fit optimization procedures. The rates of TEWL of forearm skin for all subjects decreased monotonically as the water vapor pressure of the carrier gas increased. Good fits of experimental in-vivo data to theoretical equations were obtained.Removal of the superficial stratum corneum cells by tape stripping increased the rates of TEWL, and K paralleled this increase; however, Pd showed little variation. Thus, K serves as a measure of the barrier component of TEWL. Rates of TEWL also showed a circadian rhythm that coincided with varations of Pd. In contrast, circadian changes of K were not apparent. This suggests that Pd may be responsible for the circadian variation in rates of TEWL and serves as a measure of the driving force component. Our results demonstrate that both K and Pd determine variations in the rates of TEWL. The use of K and Pd provide a more exact and reliable method for evaluating skin water loss than the rate of TEWL itself. Both parameters will be very useful in the fields of cosmetic science, dermatology and physiology. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10607 |
in IFSCC MAGAZINE > Vol. 6, N° 1 (01-02-03/2003) . - p. 9-13
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