UJI EFEKTIVITAS ANTIOKSIDAN LOSIO EKSTRAK METANOL BUAH NAGA MERAH (Hylocereus polyrhizus Britton dan Rose)

Abstract

Hylocereus polyrhizus Britton and Rose (Red dragon fruit) has been shown to
have antioxidant activity. The fruit mainly contains vitamin C, polyphenol, flavonoid.
These compound are able to prevent radicals forming which can cause aging or other
diseases. This research was aimed to investigate antioxidant efectivity from H. polyrhizus
in form of lotion. Formulation of lotion made with 5 concentration from H. polyrhizus
methanol extract. There are 0,04; 0,08; 0,16; 0,32 and 0,64%. Lotion antioxidant
effectivity was analyzed with DPPH method and observed physicochemical properties are
organoleptic, dispersive power, adhesion, viscosity and pH. The research showed H.
polyrhizus methanol extract had antioxidant effectivity with percent inhibition as big as
19,99 ±0,33; 25,01 ±0,08; 39,14 ±0,04; 66,69 ±0,12 dan 83,37 ±0,05. Result data analysis
showed significantly different of the antioxidant effectivity test and the physicochemical
properties test. Dispersive power obtained in the range of 5,55-6,9 cm, adhesion obtained
in the range 56,33-64,67 s, pH obtained in the range 7,81-7,89 and viscosity obtained
with a value of 40 poise that showed lotion had good physicochemical and in range of
allowable. The physical stability observation of five formula with cycling test method
showed unstability cause discolouration (oxidation). As well as the methods of
mechanical test showed unstability of lotion because saponification process.

Keywords:   Hylocereus polyrhizus, Antioxidant, DPPH, physicochemical test.