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44 Results
Section: Testing > Sun Protection
Efficacy
Kao Takes the Heat Off Infrared-exposed Skin
By focusing on principle factors related to light wave interference, Kao researchers have identified a means to selectively block the NIR wavelength.
Method/Process
[video] Novel In vitro SPF Test Method Validated
Validation criteria have been a shortcoming of in vitro SPF testing; until now. A new method recently was validated; Marc Pissavini, Ph.D., explains, in this video interview.
Literature/Data
Nicotinamide Can Protect Skin Cells From UV-Induced Damage
Italian researchers have discovered that a form of vitamin B3 can help protect skin cells from certain types of UV radiation.
Sun Protection
Quantifying Benzophenone-3 and Octyl Methoxycinnamate in Sunscreen Emulsions
The authors have validated a high performance liquid chromatographic (HPLC) method for the quantitative determination of benzophenone- 3 and octyl methoxycinnamate present in sunscreen emulsions.
Sensory
UV Transmission Assessment: Influence of Temperature on Substrate Surface
This work evaluates the impact of temperature on test substrate surfaces during the application, spreading and drying steps of the in vitro method to measure ultraviolet (UV) transmission. The authors work in a range between 20°C and 35°C, and demonstrate that controlling temperature is a key test parameter that should be strictly controlled to ensure reliability.
Sun Protection
In vitro/vivo SPF Correlation and Repeatability According to Substrate
This work evaluates the impact of three different substrates on in vitro SPF measurements, and defines experimental conditions to improve their correlation with in vivo values. Evaluations of 32 products, shown here, led the authors to conclude that molded substrates improved repeatability and correlation with in vivo SPF values.
Sun Protection
SPF Tests Reveal No Ideal In vitro Substrate Exists
In vitro SPF measurements are challenged by reproducibility, repeatability and correlation with in vivo values. Here, the authors assess sunscreen adhesion to the test substrate support, since poor adhesion produces bad results. Surface substrates are characterized by functional group, charge, wettability and surface morphology. Eight w/o and o/w emulsions also are tested. Results indicate an ideal in vitro test substrate does not exist.
Literature/Data
In Light of Exposure: Understanding Avobenzone Part I, Characterization
Avobenzone is a widely used UV-absorbing organic filter. Its dynamic nature and photophysical and photochemical properties are responsible for its widespread use. This first in a two-part series reviews its inherent characteristics and behavior in solvents; part two will consider its behavior with other sunscreens and in formulas.
Sun Care
In Light of Exposure: Understanding Avobenzone Part II, Application
Avobenzone is a widely used organic UV filter. Its dynamic nature and unique properties are responsible for its widespread use and forms. This second in a two-part series considers avobenzone’s behavior with other sunscreens and in formulas; part one reviewed its characteristics and behavior in solvents.
Sun Protection
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.
Sun Protection
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.
Sun Protection
In vitro/vivo SPF Correlation and Repeatability According to Substrate
This work evaluates the impact of three different substrates on in vitro SPF measurements, and defines experimental conditions to improve their correlation with in vivo values. Evaluations of 32 products, shown here, led the authors to conclude that molded substrates improved repeatability and correlation with in vivo SPF values.
Sun Protection
UV Transmission Assessment: Influence of Temperature on Substrate Surface
This work evaluates the impact of temperature on test substrate surfaces during the application, spreading and drying steps of the in vitro method to measure ultraviolet (UV) transmission. The authors work in a range of temperatures, between 20°C to 35°C, and demonstrate that controlling temperature is a key parameter and should be strictly controlled to ensure reliability.
Method/Process
Method to Reproduce In vitro Cosmetic Product Photostability Findings
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.
Event Coverage
[video] News and Insights: SPF Testing, Pigment Restrictions & Cosmeceuticals
Summer has arrived, along with this week's recap from
Cosmetics & Toiletries
. Watch the video for our take on SPF 100+ testing, novel textures and more!
Magazine
Are UV Tests and Protection Headed in the Right Direction?
Knowledge in sun protection has become more comprehensive, making sunscreen testing and development more challenging. This article explores what we know and what is needed in terms of sunscreen testing, regulation and consumer communication.
Sun Protection
Improving the UV Exposure of Sunscreen During In vitro Testing
In any sun protection evaluation method, an irradiation step is required to determine the photostability of the UV filters in a product. The aim of this study was to identify key parameters involved to improve this UV exposure. Here, the authors consider temperature at the substrate surface, air flow influence and beam uniformity during UV exposition.
Sun Protection
Sandblasting to Improve the Reproducibility of In vitro Sunscreen Evaluation
SPF test results from substrates treated using a traditional sandblasting technique are compared with those from substrates treated using a new process. Based on the topographic control of 10 batches and 34 sunscreen evaluations, the authors concluded the new process had better topographic reproducibility, consequently improving the SPF repeatability and reproducibility in vitro.
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