The effects on scavenging of free radicals of chemical components in the water extract from Hylocereus undatus (Haw.) Britt. et. Rose
The preliminary tests of the chemical components in the water extract from Hylocereus undatus (Haw.) Britt. et. Rose were experimentized by color reaction and precipitation reaction. The types of the main components were identified and their contents were determined. After the main components were extracted and isolated, their inhibition on free radicals were evaluated. The results showed that there were saccharides and glycoside, organic acid, tannins, amino-acid and saponins in the water extract, in which the contents of the saccharides and tannins were higher than the others. The experiments also showed that these components had some inhibitory effects on superoxide anion and hydroxyl free radicals, in which the polysaccharides had stronger inhibition than the others.