Abstract
Dioscorea hispida or ubi gadong is considered as one of the most unutilized yam species due to a poisonous alkaloid called dioscorin compound. In contrast, the ubi gadong extract contains a phenolic compound that can act as antioxidant, anti-hypertensive, and immunomodulatory for common diseases. Hence, in this study, the properties of phenolic compound presence in ubi gadong tubers’ extract are investigated. The ubi gadong sample is subjected to Soxhlet and MSPD extraction method. The ferric reducing antioxidant power (FRAP) method was used to determine the antioxidant activity and gallic acid reduction for total phenolic content (TPC) analysis. The elemental content was analyzed using inductively coupled plasma atomic emission spectroscopy (ICP-OES). The percent yield of TPC ranges from 10.2 to 18.16% in both methods. The FRAP assay is ranging from 0.015 to 0.33 (mM Fe (II)/10 g) with the correlation coefficient of 0.9974. Only Hg metal is detected in the samples with a concentration of 0.08 mg/kg. The extract then was formulated as the main ingredient of rejuvenating facial soap bar.
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