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Recent in Testing (page 29 of 37)

Analyzing Deposition from Rinse-off Hair Products

Nov 4, 2013 | Qing Huang, Zhen-Wu Mei, Koji Takata and Jianzhong Yang, Beauty & Health Innovation Co., Ltd.

The most common approach to determine ingredient deposition on hair is to analyze the treated tresses, but this poses several challenges. Instead, the authors describe a novel approach based on determining the amount of ingredient collected in the rinse water, and back-calculating the amount deposited on hair. Development and validation efforts discussed here use polydimethylsiloxane as a model compound.

Influence of Pressure During Spreading on UV Transmission Results

Nov 4, 2013 | Sébastien Miksa, Dominique Lutz and Céline Guy, HelioScreen Labs

This work evaluates the impact of applied pressure during sample spreading on the in vitro measurement of UV transmission. The authors work in a range of pressures between 50–200 g and demonstrate that pressure control is a key parameter that should be strictly controlled to ensure the reliability of test results.

Influence of Pressure During Spreading on UV Transmission Results

Nov 4, 2013 | Sébastien Miksa, Dominique Lutz and Céline Guy, HelioScreen Labs

This work evaluates the impact of applied pressure during sample spreading on the in vitro measurement of UV transmission. The authors work in a range of pressures between 50–200 g and demonstrate that pressure control is a key parameter that should be strictly controlled to ensure the reliability of test results.

Anti-wrinkle Claims Substantiation

Nov 4, 2013 | Chris McLeod, HPCI media

Personal care is now dominated by want rather than need, and one facet at the crux of this trend is the taboo word of the century: wrinkles. As with the majority of cosmetic products and claims in the 21st century, product development teams aim to differentiate their products from competitors in one way or another, to create a successful brand and generate profit.

In Vitro Methods to Test Materials for Ozone Protective Capabilities

Oct 28, 2013 | Robert Holtz, BioInnovation Laboratories

Many markers can be used to indicate epidermal stress. Therefore, it becomes clear that the skin is also a sensitive target to ozone exposure and one that could greatly benefit from cosmetic or personal care materials designed to protect against ozone.

Sensitive Skin Syndrome: Methodological Approaches

Sensitive Skin Syndrome: Methodological Approaches

Oct 27, 2013 | Miranda Farage, PhD, Procter & Gamble, Cincinnati; and Howard Maibach, University of California School of Medicine, San Francisco

Manufacturers of topical products perform rigorous testing to assure their products are safe for consumers. Of particular interest is determining whether products will irritate the skin of the approximately 50% of consumers surveyed who consider themselves to have “sensitive” skin. The present article describes three such irritancy tests.

Measuring the Antioxidant Potential of an Acai Extract

Measuring the Antioxidant Potential of an Acai Extract

Oct 24, 2013 | Karina Coyado Bispo, Beraca

The antioxidant potential of cosmetic materials can be evaluated by several methodologies, including a commercial kit that measures total antioxidant status, as illustrated here with a commercial extract from the fruit of the açaí, a Brazilian palm tree. Applications in antiaging products are suggested.

C + K Introduces Tewameter with Three Probes for Better Efficiency

C + K Introduces Tewameter with Three Probes for Better Efficiency

Oct 23, 2013

Courage + Khazaka has upgraded its well-known TEWL and barrier function measurement device, the Tewameter, with three probe heads for better efficiency.

Measuring and Pre-selecting Functional Filler Pigments

Measuring and Pre-selecting Functional Filler Pigments

Oct 9, 2013 | Miriam Becker, Christoph Schmidt, PhD, Veronika Hochstein and Xenia Petsitis, Merck KGaA, Darmstadt, Germany

Functional filler pigments play an important role in adjusting optical properties such as transparency and soft focus effects in cosmetics. However, their suitability for specific formulas is not apparent until time-consuming tests using many different fillers have been conducted. A new method to predetermine the soft focus effects of functional filler pigments is described here.

In Vitro UV Testing—Robot vs. Human Spreading for Repeatable, Reproducible Results

Oct 8, 2013 | Sébastien Miksa, Dominique Lutz and Céline Guy, HelioScreen Labs

Repeatability and reproducibility are crucial to validate any test method. In order to master these criteria, the authors developed an automated spreading device and compared it with human spreading. Application of the device in eight laboratories and using 36 sunscreens revealed great improvements via automated spreading, ensuring good intra- and inter-laboratory variability.

In Vitro UV Testing—Robot vs. Human Spreading for Repeatable, Reproducible Results

Oct 7, 2013 | Sébastien Miksa, Dominique Lutz and Céline Guy, HelioScreen Labs

Repeatability and reproducibility are crucial to validate any test method. In order to master these criteria, the authors developed an automated spreading device and compared it with human spreading. Application of the device in eight laboratories and using 36 sunscreens revealed great improvements via automated spreading, ensuring good intra- and inter-laboratory variability.

Molecular Modeling of Skin care Products: Application for the Design of Pepidomimetics

Oct 6, 2013 | Jean-Francois Nicolay, PhD, Exsymol S.A.M. and Mindy Goldstein, PhD, Estée Lauder

Molecular modeling has been used in the pharmaceutical industry for years to predict how a new molecule may work based on research conducted with molecules of a similar structure. The cosmetics industry has also begun to use this technology to predict the behavior of new molecules on skin and in skin care applications.

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