Recent in Testing (page 13 of 26)

Influence of Pressure During Spreading on UV Transmission Results

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

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

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

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

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

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

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. Therefore, 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

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

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

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.

Using Ultrasound Scanning to Characterize Colloidal Particles

Changes in the macroscopic nature of aqueous or colloidal formulations can lead to changes in the odor, appearance or feel of a product. Data presented in this article demonstrates ultrasound scanning to determine formulation shelf life and monitor product quality.

Solar Flair

If like me, you’re just daydreaming of the beach, this collection of articles will enlighten you with its focus on sun protection, SPF testing, damage repair and more.

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