Castanea sativa fruit processing generates high amounts of by-products, mostly bur.\nCurrently, the cosmetic industry has a great interest in natural extracts as antioxidant sources.\nIn the present study, C. sativa bur extract was used as the active ingredient, in different amounts,\nin topical hydrogels. The formulations were characterized regarding total phenolic and flavonoid\ncontents (TPC and TFC, respectively), antioxidant activity (DPPH radical scavenging capacity and\nferric reducing antioxidant power (FRAP)) and technological and microbiological properties. The\nsame parameters were evaluated after 30 days of storage at 4 ââ??¦C (T30/4\nââ??¦C) and 20 ââ??¦C (T30/20\nââ??¦C).\nAt time 0 (T0), the TPC ranged between 0.79 and 9.65 mg of gallic acid equivalents (GAE)/g gel,\nwhile TFC varied from 0.05 to 1.23 mg of catechin equivalents (CAE)/g gel. Antioxidant activity\nwas high for both assays, with values at T0 ranging between 98.41 and 1013.43 Ã?¼mol of ferrous\nsulphate equivalents (FSE)/g gel and varying between 431.96 and 990.84 Ã?¼g of Trolox equivalents\n(TE)/g gel for FRAP and DPPH assays, respectively. No formulation exceeded the defined criteria\nin microbiological counts. All formulations showed similar technological profiles but particular\nattention should be given to pH. The gel with 50% of extract (F3) was selected as the best one for\npotential cosmetic applications.
Loading....