Recent in SPF Testing (page 3 of 3)
Mar 2, 2011 | Marc Pissavini and Olivier Doucet, Coty-Lancaster; and Olivier Brack, Statistique Industrielle KHI2 Consulting (KSIC)
Methods for determining SPF in vivo are based on a biological response by human skin. To overcome intrinsic variation in these methods, large numbers of volunteers and statistics are required; however, these concepts are often poorly understood or worse, misinterpreted. This article discusses how these values should be interpreted and explains what they mean to formulators.
Mar 2, 2011 | Paul G. McCormick, University of Western Australia
A sunscreen layer’s thickness is critical to its SPF. However, current regulations specify a mass application rate for testing, rather than a volumetric application rate. This significantly underrates the SPF values of mineral sunscreens due to their higher densities since, compared with their relative organic counterparts, thinner films are being tested, as will be shown here.
Aug 28, 2009 | M. Pissavini, S. Marguerie, A. Dehais, L. Ferrero and L. Zastrow, Coty-Lancaster International
Here, the authors describe a variable that affects the results of SPF testing in vitro—the roughness parameter—and investigate this variable using standard and molded poly(methyl methacrylate) (PMMA) substrates. They conclude that use of a molded substrate, along with the described control chart, improves the reproducibility of in vitro SPF test results.
Jul 1, 2009
Cutest Systems Ltd has installed a Labsphere UV-2000S sunscreen analyzer at the companies laboratories in Cardiff, Wales.
Apr 8, 2008
A new UV transmittance analyzer has been designed to exceed Colipa's UVA protection factor (UVA-PF) requirements to support the development of higher protection factor sunscreens.
Oct 1, 2007
Laboratoire Dermscan and HelioScreen Labs are combining their skills to offer a complete new in vitro / in vivo service in the field of sunscreen testing.
Apr 26, 2006 | M. Pissavini and L. Ferrero, V. Alard, U. Heinrich and H. Tronnier, D. Kockott, D. Lutz, V. Tournier, M. Zambonin, and M. Meloni
A ring test at six European test centers showed that SPF evaluations with good reproducibility and comparability could be obtained by an in vitro protocol measuring either transmittance or erythema-effective irradiance of product samples applied on PMMA plates.
Jan 13, 2006
ISPE Laboratories presents a new method to evaluate the solar protection factor of water-resistant products.
Dec 23, 2005 | M. Ines R. M. Santoro, D.A.G.C. Oliveira, E.R.M. Kedor-Hackmann, A. K. Singh, Department of Pharmacy, Faculty of Pharmaceutical Sciences, University of Sao Paulo
The authors have validated a high performance liquid chromatographic (HPLC) method for the quantitative determination of benzophenone- 3 and octyl methoxycinnamate present in sunscreen emulsions.
Dec 13, 2005 | J. Awatramani and J. E. Nucci, Revlon Consumer Products - Research and Development
The authors propose and validate an HPLC method for simultaneous quantitation of commonly used commercial sunscreen actives and preservatives in cosmetic emulsions.