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Sun Care
New in Sun Care (page 3 of 8)
Jan 29, 2010 | 03:31 PM CST
Controlling Hydroxyl Radical Formulation in TiO2 Sunscreens
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
Micron-sized Zinc Oxide Dispersion for Transparent High SPF Formula
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
Singlet Quenching Proves Faster is Better for Photostability
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
Chitin Nanofibrils for Improved Photoprotection
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.
Jan 30, 2009 | 10:23 AM CST
The Quest for Avobenzone Stabilizers and Sunscreen Photostability
By: Christine Mendrok-Edinger, Kimberly Smith, Ann…
Butyl methoxydibenzoyl methane (BMDBM) is well-known as an effective UVA filter when it is stabilized. Here, the authors measure the efficiency of ten commercially available products that are reported to stabilize BMDBM. The most effective product found was octocrylene that, being a UVB filter, also contributed to the SPF.
Feb 05, 2008 | 08:32 AM CST
A Sunscreen Formulation for Acne-prone Skin
By: P. Morganti, Mavi Sud Srl; E. Ruocco, Universi…
This article describes the study of a topical sunscreen formulation that contains titanium dioxide and ethylhexyl methoxycinnamate for UV protection, and phosphatidylcholine and hydrosoluble azelaic acid for acne control.
Feb 05, 2008 | 08:13 AM CST
Research Pathways to Photostable Sunscreens
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.
Jun 01, 2007 | 10:33 AM CDT
Enzymatic Synthesis of Isoamyl p-Methoxycinnamate from the Natural Ethyl Ester
By: Ian L. Gatfield, Jens-Michael Hilmer and Heinz…
The naturally occurring ethyl ester of p-methoxycinnamic acid can undergo efficient enzymatic conversion into the corresponding isoamyl ester via lipase catalysis using natural isoamyl alcohol as reactant. This transesterification provides a natural route to a popular sunscreen filter.
Apr 30, 2007 | 03:12 PM CDT
Film-Forming Polymers as a Strategy for Sunscreen Efficacy
By: Jennifer Davis, Doreen Petersen and Daniel Li,…
Acrylic-based film-forming polymers lend properties of water resistance to both traditional and nontraditional sunscreen formulations. Dehydroxanthan gum is a film-forming polymer, a rheology modifier and an SPF booster in sunscreen systems containing zinc oxide. Illustrations are provided...
Mar 02, 2007 | 10:46 AM CST
A Dermatological View: Antioxidant Inhibits UV Erythema In Vivo in Humans
By: Hongbo Zhai, MD, and Howard I. Maibach, MD, Un…
Described here was an in vivo model to determine antioxidative capacity of a topical skin care emulsion versus the emulsion’s vehicle on human skin that was exposed to UVR. Results suggest the test emulsion and its vehicle control inhibited the induction of erythema and reduced inflammation caused by the UV exposure.