Antioxidant Activity of Dendrobium lasianthera and Geodorum densiflorum

Abstract

Many antioxidants are obtained from plants that contain secondary metabolic compounds such as alkaloids, flavonoids, saponins, tannins, etc. Thus, the search for plants that are rich in natural antioxidants is conducted continuously, including orchids. Dendrobium lasianthera and Geodorum densiflorum are orchids having secondary metabolites that are thought to have antioxidant activity. This study aims to determine the antioxidant activity of the ethanolic extracts of these two types of orchids using the DPPH method (1,1-diphenyl-2-picrylhydrazine). The results showed that the IC50 of the ethanolic extract of the leaves of D. lasianthera was 288.24 ppm and the stem was 26.27 ppm. The IC50 of the ethanol extract of leaves of G. densiflorum was 277.65 ppm and of the tubers was 197.48 ppm. Finally, the leaves have negligible antioxidant activity, but the stems and tubers had activity ranging from weak to very strong.