Perbandingan Kadar Senyawa Fenolik Dalam Ekstrak Ubi Jalar Ungu (Ipomoea Bata…

vii ABSTRACT Purple sweet potatoes (Ipomoea batatas) tubers contain phenolic compounds which act as natural antioxidants. Extraction of phenolic compounds from purple sweet potatoes can be done by either one of two methods. The first method is the Pothitirat modified extraction method. In this method,the dry powder of I. batatas was incubated with 50% (v/v) ethanol in Na-acetate buffer pH 5.5…