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New in Sun Care (page 3 of 8)
Jun 01, 2011 | 01:31 PM CDT
By: Thomas O’Lenick, PhD, SurfaTech Corp.; and Den…
The present paper evaluates the effects of solvent systems on the in vivo SPFs of sunscreen formulations. Formulations incorporating identical active systems were prepared using traditional solvent systems and varying concentrations of sorbeth 2 hexaoleate, a new ester having both polar and nonpolar segments. Results indicate the ester enhances SPF in a dose-dependent manner.
Jun 01, 2011 | 01:26 PM CDT
By: Mike J. Fevola, Johnson & Johnson
While TiO2 is often incorporated as a colorant and an opacifier in cosmetics and personal care products, its most important applications are as a sunscreen active and as a component of specialty pigments for color cosmetics.
Mar 02, 2011 | 03:36 PM CST
By: N. Dayan, PhD, Lipo Chemicals Inc.; A. Ballant…
High energy visible (HEV) light recently has been suspected of causing as much damage as UVA and UVB combined. Thus, the present paper describes a fractionated melanin tailored to absorb light in the visibile 400–500 nm range. In addition, because the material exhibits color, the authors focus on formulation techniques to incorporate it into semi-solid formulations.
Jan 03, 2011 | 02:18 PM CST
By: Craig Bonda and Jean Zhang, The HallStar Compa…
This study examines the photostability of retinol and retinyl palmitate, finding they break down rapidly when exposed to UV radiation in the 290–400 nm range. This severely reduces their concentrations in finished formulations. However, when combined with ethylhexyl methoxycrylene, these retinoids are shown to be protected against photodegradation, thus preserving their concentrations both during the manufacturing process and following application to the skin.
Sep 01, 2010 | 10:41 AM CDT
By: Isabelle Rodriguez, PhD, Roberto Fenollosa, Ph…
Silicon microspheres are described as UV, visible and infrared (IR) radiation filters. Parameters of these spheres including shape, smoothness, refractive index and size are examined for their potential benefits in cosmetic formulations. Finally, the ability of the spheres to block IR radiation is evaluated for thermo-regulatory effects.
Sep 01, 2010 | 10:30 AM CDT
By: Paul Staniland, PhD, and Julian P. Hewitt, Cro…
The production of a range of titanium dioxide-based dispersions is explored to provide enhanced UVA protection, in comparison with ultrafine titanium dioxide. Formulations containing these dispersions as the only active are shown to achieve a UVA protection factor that is 1/3 of the labeled SPF value, thus meeting European Commission recommendations.
Jan 29, 2010 | 03:31 PM CST
By: Nai-Fang Chang and Chang-Chin Kwan, Providence…
Titanium dioxide (TiO2) is an effective sunscreen agent but its rutile form may produce hydroxyl radicals upon exposure to sunlight. Thus, the authors use salicylic acid as a capture agent to examine the development of free radicals in solutions or creams containing TiO2. They also explain how the choice of emulsion may reduce free radical generation.
Jan 29, 2010 | 03:25 PM CST
By: Paul McCormick, PhD, Antaria Ltd.; Robert Flet…
Regulatory bodies require quantifiable, photostable UVA protection for sunscreens and while zinc oxide provides an effective option, historically, its white appearance on skin has limited its acceptance. Therefore, in the present article the authors explore a micron-sized zinc oxide dispersion technology to enable the formulation of transparent yet full spectrum sunscreen formulas.
Jan 29, 2010 | 03:20 PM CST
By: Craig Bonda and Anna Pavlovic, The HallStar Co…
The faster a photostabilizer works, the fewer opportunities for destructive chemical reactions. Here, the author describes a new photostabilizer, ethylhexyl methoxycrylene, which acts by quenching the singlet excited state of UV filters. The data shows how this material sets a new standard for the photostabilization of avobenzone, even in the presence of octyl methoxycinnamate.
Aug 28, 2009 | 03:10 PM CDT
By: Pierfrancesco Morganti, University of Naples I…
Chitin nanofibrils (CN) are capable of interacting with cosmetic actives by binding to the stratum corneum, thus influencing their thermodynamic activity. Here, the authors test various sunscreen samples and determine that the addition of CN provides an interesting boost to the photoprotective activity of sunscreens.