Formulation of Rosella Gel Blush on with Copigmentation to Enhance Color Stability and Antioxidant Activity
DOI:
https://doi.org/10.56904/jgpr.v1i01.112Keywords:
blush on gel, copigmentation, anthocyanin, rosella flower, ferulic acidAbstract
The use of synthetic dyes in cosmetics, such as blush on, has the potential to cause harmful side effects, including skin irritation, respiratory issues, and carcinogenicity. To avoid these risks, natural dyes like rosella (Hibiscus sabdariffa L.) extract are considered a safer alternative. However, natural colorants often lack stability and tend to fade easily. This study aims to improve the color stability and antioxidant activity of rosella flower extract through copigmentation techniques with ferulic acid at various ratios (0.5:1, 0.8:1, 1:1) and concentrations in a blush on gel formulation (15%, 20%, 25%). Color stability was tested using a UV-Vis spectrophotometer at wavelengths of 475–550 nm, showing that the 1:1 copigmentation ratio provided the best results, with the smallest color degradation against pH (22%), light (3.4%), and temperature (2.0%). Antioxidant activity was measured using a UV-Vis spectrophotometer at a wavelength of 517 nm, where the IC50 value of rosella extract was found to be 2.75 μg/ml. Antioxidant activity increased after copigmentation, with IC50 values of 2.46 μg/ml at the 0.5:1 ratio, 1.70 μg/ml at the 0.8:1 ratio, and 0.94 μg/ml at the 1:1 ratio. As a comparison, the positive control vitamin C had an IC50 value of 0.55 μg/ml. These results indicate that copigmentation techniques can enhance the color stability and antioxidant activity of rosella-based blush on gel, making it a potential candidate for safer and more effective cosmetic products.
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