RESUMEN
All ten compounds were isolated from the methanolic extract of the whole plants of Diodia teres through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as three iridoid glycosides, asperuloside, geniposidic acid and asperulosidic acid, a coumarin glycoside, scopolin, and six flavonoids, rutin, kaempferol-3-O-rutinoside, quercitrin, astragalin, isoquercitrin and quercetin by spectroscopic analysis.
Asunto(s)
Estructuras de las Plantas/química , Plantas Medicinales/química , Rubiaceae/química , Química Farmacéutica/métodos , Cromatografía Liquida/métodos , Cumarinas/química , Cumarinas/aislamiento & purificación , Flavonoides/química , Flavonoides/aislamiento & purificación , Glucósidos/química , Glucósidos/aislamiento & purificación , Glicósidos/química , Glicósidos/aislamiento & purificación , Glucósidos Iridoides , Iridoides/química , Iridoides/aislamiento & purificación , Quempferoles/química , Quempferoles/aislamiento & purificación , Metanol/química , Extractos Vegetales/químicaRESUMEN
The antioxidant activity of Juniperus chinensis (Cupressaceae) was determined by measuring the radical scavenging effect on DPPH (1,1-diphenyl-2-picrylhydrazyl). The methanolic extract of J. chinensis heartwood showed the strong antioxidant activity. The antioxidant activity of n-BuOH soluble fraction was stronger than that of the others, and the fraction was subjected to purification by repeated silica gel and Sephadex LH-20 column chromatography. Quercetin, naringenin, taxifolin, aromadendrin and isoquercitrin were isolated from the n-BuOH fraction. Their structures were elucidated by physico-chemical and spectroscopic studies.