Assessing the Stability of Sunscreens Containing Grape Seed Extract

 In a study investigating the stability of sunscreen ingredients and catechins in grape seed extract, which are sensitive to environmental factors, sunscreens containing grape seed extract in climate zone IVb (an environment averaging 30°C and 65% RH) were tested. Assess accelerated and long-term chemical and mechanical stability of formulations. Accelerated stability studies were performed at 30°C ± 2 and 50°C ± 2, 75 ± 5% relative humidity for 6 months, and long-term stability studies at 5°C ± 5 at 5°C ± 5.


As a result, all formulations tested became less stable at elevated temperature conditions. The catechin and epicatechin contents of sunscreens containing grape seed extract decreased to 37% and 50%, respectively, at 50 degrees, while the UV filters were considered stable. Although catechins decreased significantly over time, polyphenols in grape seed extract remained unchanged under different storage conditions. The SPF value and water resistance of sunscreens containing grape seed extract were maintained during the test.

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