Abstract
Clay is naturally occurring and poses a low risk. It is distinguished by mineral composition and ability to adsorb plant colorants and phytochemicals effectively. This study aimed to enhance the stability of bio-clay by preparing body mud scrubs through a solid-state reaction, combining volcanic clay with herbal plants, including Bougainvillea spp., Pandanus amaryllifolius Roxb., and Curcuma longa L. (bio-clay). The characterization of purification clay revealed strong stability within its mineral composition. The optimum condition for sampling was 4 °C, which reserved the total phenolic content (TPC), 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay. A high Trolox equivalent antioxidant capacity (TEAC; mg TEAC/g sample) and low half-maximal inhibitory concentration (IC50) indicated excellent antioxidant activity. Over a storage period of 28 d, the Bougainvillea spp., Curcuma longa L., purified clay + Bougainvillea spp., and purified clay + Curcuma longa L. samples retained their stability. Their TPC, % scavenging, TEAC, and IC50 showed dominant antioxidant activity, stable active phenolic compounds, and the maintenance of extensive amounts. This compound is widely applied as a unique cosmetic ingredient.
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