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Article

A Novel Quality Control Method for the Determination of the Refractive Index of Oil-in-Water Creams and Its Correlation with Skin Hydration

School of Pharmacy and Pharmaceutical Sciences, Faculty of Health Sciences and Wellbeing, University of Sunderland, Sunderland SR1 3SD, UK
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Academic Editor: Amparo Salvador Carreño
Cosmetics 2021, 8(3), 74; https://doi.org/10.3390/cosmetics8030074
Received: 29 June 2021 / Revised: 1 August 2021 / Accepted: 18 August 2021 / Published: 20 August 2021
(This article belongs to the Special Issue Current and Evolving Practices in the Quality Control of Cosmetics)
The sensory properties of cosmetic products can influence consumers’ choice. The accurate correlation of sensory properties, such as skin hydration, with the material properties of the formulation could be desirable. In this study, we aimed to demonstrate a new method for the in vitro measurement of the refractive indices (RIs) of turbid creams. The critical wavelength of each cream was obtained through direct measurement using a sun protection factor (SPF) meter; the wavelength value was then applied in the Sellmeier equation to determine the RI. The results obtained from the in vitro skin hydration measurement for each cream correlated with their RI values. This suggests that RI measurements could be a useful predictive tool for the ranking of creams in terms of their skin hydration effects. View Full-Text
Keywords: sensory testing; refractive index; critical wavelength; turbidity; skin hydration; creams sensory testing; refractive index; critical wavelength; turbidity; skin hydration; creams
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MDPI and ACS Style

Adejokun, D.A.; Dodou, K. A Novel Quality Control Method for the Determination of the Refractive Index of Oil-in-Water Creams and Its Correlation with Skin Hydration. Cosmetics 2021, 8, 74. https://doi.org/10.3390/cosmetics8030074

AMA Style

Adejokun DA, Dodou K. A Novel Quality Control Method for the Determination of the Refractive Index of Oil-in-Water Creams and Its Correlation with Skin Hydration. Cosmetics. 2021; 8(3):74. https://doi.org/10.3390/cosmetics8030074

Chicago/Turabian Style

Adejokun, Deborah A., and Kalliopi Dodou. 2021. "A Novel Quality Control Method for the Determination of the Refractive Index of Oil-in-Water Creams and Its Correlation with Skin Hydration" Cosmetics 8, no. 3: 74. https://doi.org/10.3390/cosmetics8030074

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