Formulation of Facial Clay Mask from Red Glutinous Rice (Oryza sativa L. var. glutinosa) Bran Extract

Abstract

Red glutinous rice (Oryza sativa L. var. glutinosa) bran, a byproduct of rice processing, is known for its antioxidant properties. This study aimed to enhance the utilization of red glutinous rice bran extract as an antioxidant by formulating it into a clay mask for facial application. Five formulations (F1 – F5) of clay mask were prepared from varying concentrations of red glutinous rice bran extract; F1 (0%), F2 (2.5%), F3 (5%), F4 (7.5%), and F5 (10%). The formulations were assessed for their organoleptic properties, and physicochemical characteristics, including homogeneity, pH, spreadability, adhesion, drying time, viscosity, and flow properties. The antioxidant activity of the formulations was evaluated using the 2,2-diphenyl-1-picryl hydrazyl (DPPH) radical scavenging assay. The clay mask of red glutinous rice bran extract was successfully formulated with a smooth clay-like consistency and a characteristic clay odour. The physicochemical properties of the clay mask formulations were greatly influenced by the concentration of red glutinous rice bran extract, but varied within acceptable limits. The formulations were homogenous with pH ranging from 4.74 – 6.00, spreadability 2.7 – 4.2 cm, adhesion 6.14 – 7.44 seconds, drying time 12.14 – 15.21 minutes, and viscosity 123,333 – 283,666 cps. The formulations exhibited strong antioxidant activity with IC50 ranging from 204.114 ppm to 19.443 ppm. Among the formulations, F5 exhibited the most favorable results, meeting the desired clay mask specifications and having the highest antioxidant activity. This study highlights the potential application of red glutinous rice bran extract in cosmetic formulations, particularly as a natural antioxidant in clay mask preparations.