Determination of Total Phenolic Content and Antioxidant Activities from Extract of the Leaf, Fruit Skin and Stem Bark of Garcinia cowa Roxb

Leaves and fruits of Garcinia cowa Roxb have been used as spices in Indonesia especially in Minangkabau tribes. It is also used in traditional folk medicine for indigestion, improvement of blood circulation, and an expectorant. G. cowa Roxb contains phenolic compounds which had activity as antioxidant. The purpose of this research is to know the total phenolic content of ethanol extract of the leaf, rind, and stem bark of G. cowa Roxb by using Folin-Ciocalteu assay and to know its antioxidant activities by using FRAP (Ferric Reducing Antioxidant Power) assay. The result of the research found that the total phenolic content of ethanol extract of the leaves, rinds, and stem bark of G. cowa Roxb. were 17.172, 9.263 and 20.040 mg/100 gram, respectively, and its antioxidant activities were 25.968, 25.137 and 26.837 mmol Fe(II)/100 gram, respectively, and antioxidant activities of Gallic acid which was used as a reference standard was 9.338 mmol Fe(II)/100 gram.