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Table of Contents
Vol. 20, No. 1, 2007
Issue release date: December 2006
Section title: Original Paper
Skin Pharmacol Appl Skin Physiol 2007;20:10–20
(DOI:10.1159/000096167)

In vitro Percutaneous Absorption and in vivo Stratum Corneum Distribution of an Organic and a Mineral Sunscreen

Mavon A. · Miquel C. · Lejeune O. · Payre B. · Moretto P.
aLaboratoire de Pharmacocinétique Cutanée, Institut de Recherche Pierre Fabre, Castanet-Tolosan, bCentre de Microscopie Electronique Appliquée à la Biologie, Faculté de Médecine de Rangueil, Toulouse, et cCentre d’Etudes Nucléaires de Bordeaux-Gradignan, Gradignan, France

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 8/18/2005
Accepted: 4/21/2006
Published online: 10/11/2006

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 1

ISSN: 1660-5527 (Print)
eISSN: 1660-5535 (Online)

For additional information: http://www.karger.com/SPP

Abstract

Sunscreens, whose main function is to protect the skin against the harmful effects of solar irradiation, should remain at the skin surface or impregnate the first layers of the stratum corneum only and not penetrate into the underlying living tissue. The goal of this work was to assess the penetration of titanium dioxide (TiO2) and methylene bis-benzotriazoyl tetramethylbutylphenol (MBBT), included in a broad-spectrum sunscreen formulation, into human skin in vivo, using the tape stripping method, and in vitro, using a compartmental approach. An additional objective was to propose an easy and minimally invasive approach to determining the percutaneous uptake of sunscreens following topical application. TiO2 and MBBT were quantified using colorimetric assay and HPLC analysis, respectively. The transmission electron microscopy and particle-induced X-ray emission techniques were used to localize the TiO2 in skin sections.More than 90% of both sunscreens was recovered in the first 15 tape strippings. In addition we have shown that the remaining 10% did not penetrate the viable tissue, but was localized in the furrows and in the opened infundibulum. Less than 0.1% of MBBT was detected in the receptor medium, and no TiO2 was detected in the follicle, viable epidermis or dermis. Thus, this in vivo and in vitro penetration study showed an absence of TiO2 penetration into the viable skin layers through either transcorneal or transfollicular pathways and negligible transcutaneous absorption of MBBT. However, differences in distribution within the stratum corneum reinforced the need for a complementary approach, using minimally invasive in vivo methodology and in vitro compartmental analysis.This combination represents a well-adapted method for testing the safety of topically applied sunscreen formulations in real-life conditions.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 8/18/2005
Accepted: 4/21/2006
Published online: 10/11/2006

Number of Print Pages: 11
Number of Figures: 7
Number of Tables: 1

ISSN: 1660-5527 (Print)
eISSN: 1660-5535 (Online)

For additional information: http://www.karger.com/SPP


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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