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Vol. 16, No. 1, 2003
Issue release date: January–February 2003
Section title: Original Research Article
Skin Pharmacol Appl Skin Physiol 2003;16:28–35
(DOI:10.1159/000068291)

Skin Penetration and Sun Protection Factor of Five UV Filters: Effect of the Vehicle

Chatelain E. · Gabard B. · Surber C.
aDepartment of Biopharmacy, Spirig Pharma Ltd, Egerkingen, and cInstitute of Hospital-Pharmacy and Department of Dermatology, Kantonsspital, Basel, Switzerland

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Article / Publication Details

First-Page Preview
Abstract of Original Research Article

Received: 4/18/2002
Accepted: 5/27/2002
Published online: 2/5/2003
Issue release date: January–February 2003

Number of Print Pages: 8
Number of Figures: 3
Number of Tables: 3

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

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

Abstract

To gain information about efficacy and safety of sunscreens, we compared the skin penetration of ultraviolet (UV) filters from two vehicles, i.e. an oil-in-water (O/W) emulsion gel and petrolatum jelly both in vitro and in vivo, as well as the corresponding pharmacological effect, i.e. the sun protection factor (SPF) in vivo. The UV filters studied were benzophenone-3 (BPH), ethylhexyl methoxycinnamate (EHM), butyl methoxydibenzoyl methane, ethylhexyl salicylate and homosalate. The human skin penetration of these five chemicals from the two vehicles was determined both in vitro using Franz cells and in vivo using a standardized tape-stripping method. The SPF of the two sunscreens was determined in vivo following the COLIPA guidelines. In vitro none of the filters permeated through the skin after 6 h of product application and very little could be found in the skin. BPH and EHM were the only UV filters found in the dermis (both after 30 min and 6 h). An effect of the vehicle could be noticed only for BPH after 30 min in the dermis and 6 h in both dermis and epidermis. In vivo, no differences in the amount of individual UV filters (in % of the applied dose) in the 15 first strips of the stratum corneum (SC) were found following 30 min of application of the formulations; however, the amount of UV filters that were retained in the SC was significantly higher (around 3 times) with the O/W emulsion gel than with the petrolatum jelly. This difference between the two vehicles was also of consequence for the SPF in vivo measured 30 min after application of the products (SPF ≅ 18 with the O/W emulsion gel compared to SPF ≅ 10 with the petrolatum jelly). By choosing the right vehicle or optimizing it, not only sunscreen products can be significantly improved in terms of pharmacological efficacy but the potential toxicological risk associated with the skin penetration of UV filters may be significantly reduced.


  

Author Contacts

Eric Chatelain
Spirig Pharma Ltd, Biopharmacy Department
PO Box 111, CH–4622 Egerkingen (Switzerland)
Tel. +41 62 3878725, Fax +41 62 3982468
E-Mail eric.chatelain@spirig.ch

  

Article Information

Received: Received: April 18, 2002
Accepted: May 27, 2002
Number of Figures : 3, Number of Tables : 3, Number of References : 18

  

Publication Details

Skin Pharmacology and Applied Skin Physiology (Journal of Pharmacological and Biophysical Research)
Founded in 1988 by H. Schaefer as ‘Skin Pharmacology’; Incorporating ‘Bioengineering and the Skin’

Vol. 16, No. 1, Year 2003 (Cover Date: January-February 2003)

Journal Editor: J. Lademann, Berlin; Hans F. Merk, Aachen
ISSN: 1422–2868 (print), 1422–2906 (Online)

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


Article / Publication Details

First-Page Preview
Abstract of Original Research Article

Received: 4/18/2002
Accepted: 5/27/2002
Published online: 2/5/2003
Issue release date: January–February 2003

Number of Print Pages: 8
Number of Figures: 3
Number of Tables: 3

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

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


Copyright / Drug Dosage

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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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