Formulasi dan Evaluasi Aktivitas Antioksidan Kombinasi Vitamin C dan Vitamin E dalam Sediaan Serum menggunakan Metode DPPH
Aprilia Nur Anifah, Dr. apt Nindya Kusumorini S. Farm; apt. Navista Sri Octa Ujiantari, S.Farm, M.Sc., Ph.D.
2026 | Skripsi | FARMASI
Excessive exposure to UV radiation can lead to skin aging triggered by oxidative stress. In this condition, vitamin C acts as an electron donor capable of neutralizing free radicals, while vitamin E works to protect cell membranes and support tissue repair. Therefore, this study aims to optimize the use of xanthan gum and glycerin in a combined vitamin C and E serum formulation to obtain a product with optimal physical characteristics, stability, and antioxidant activity based on the DPPH method.
The formula optimization was carried out using the Simplex Lattice Design (SLD) method with Design Expert software version 13. The evaluation of the optimum formula included organoleptic parameters, homogeneity, pH, spreadability, adhesiveness, viscosity, and storage stability. The data were statistically analyzed using ANOVA at a 95% confidence level, followed by a Post Hoc test, as well as antioxidant activity testing of the combination vitamin C and vitamin E serum using the DPPH method.
The results showed that the optimum formula for the combination serum of vitamin C and vitamin E consisted of 1% glycerin and 1% xanthan gum, producing a viscosity of 1166,46 cPs, a spreadability of 5,78 cm², an adhesiveness of 65,53 J/m³, and a pH of 5,25. The results of the Tukey Post Hoc analysis indicated no significant differences (sig. > 0,05) in each parameter during the three-cycle storage stability test. The combination serum of vitamin C and vitamin E exhibited an IC?? value of 28,1689 ppm (v/v). Based on these results, it can be concluded that the serum formulation combining vitamin C and vitamin E with xanthan gum and glycerin produced a stable preparation with good physical characteristics and strong antioxidant activity, indicating that the research objective has been achieved.
Kata Kunci : Antioksidan, Serum, Vitamin C, Vitamin E, Metode DPPH