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New in SPF Testing (page 2 of 3)
Apr 09, 2012 | 03:30 PM CDT
By: Katie Anderson
After 25 years in the industry, Gavin Greenoak, managing and scientific director of the Australian Photobiology Testing Facility Pty., Ltd. (APTF), continues to strive for a better understanding of the interaction of light and the human body. Greenoak’s career began in cancer research, which has afforded him unique insight of skin biology and the effects of sun exposure.
Mar 01, 2012 | 04:37 PM CST
By: Marc Pissavini, PhD, Adeline Baud, Stéphanie M…
The present article describes a reproducible method for determining the photostability of sunscreen products. This method is based in part on the in vitro determination of the UVA protection factor as proposed by Colipa for the irradiation aspect, and on the spectroscopy of a sunscreen in dilute solution for the absorbance measurement aspect.
Jan 26, 2012 | 02:37 PM CST
By: Brian Diffey, PhD DSc, Newcastle University, U…
“Science Exposed” is a new column aimed at digging into industry controversies to strip them down to the scientific facts. Here, sun protection expert Brian Diffey, PhD DSc, critiques the current SPF test method.
Aug 16, 2011 | 05:55 PM CDT
By: Anthony J. O'Lenick Jr., Siltech LLC; and Denn…
In order to prepare the industry for the upcoming Sunscreen Symposium, organized by the Florida chapter of the Society of Cosmetic Chemists, industry expert Tony O’Lenick asks Dennis Lott to explain the difference between SPF and calculated SPF. This is the first of two columns on sun protection.
Mar 02, 2011 | 03:58 PM CST
By: Marc Pissavini and Olivier Doucet, Coty-Lancas…
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 02, 2011 | 03:53 PM CST
By: Paul G. McCormick, University of Western Austr…
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 | 04:05 PM CDT
By: M. Pissavini, S. Marguerie, A. Dehais, L. Ferr…
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 01, 2009 | 10:58 AM CDT
Cutest Systems Ltd has installed a Labsphere UV-2000S sunscreen analyzer at the companies laboratories in Cardiff, Wales.
Apr 08, 2008 | 01:43 PM CDT
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.
Feb 05, 2008 | 08:13 AM CST
By: Craig Bonda, The HallStar Company
This article provides a visual depiction of pathways that UV filters undergo when exposed to solar radiation; such pathways often lead to photo-instability. A fluorescence technique is described that has led the author to identify compounds that preserve photostability in a novel manner— by quenching the UV filter’s singlet excited state.