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Isolation of Stigmasterol and β-Sitosterol from the dichloromethane extract of Rubus suavissimus
Purification of the dichloromethane (CH2Cl2) fraction of the aqueous extract of Rubus suavissimus resulted in the isolation of two sterols namely stigmasterol and β-sitosterol. The structures of the…
The aroma, taste, color and bioactive constituents of tea
The genus Camellia sinensis belongs to the family of Theaceae of the flowering plants. The leaves and leaf buds of C. sinensis are used to produce tea. The chemical composition of tea leaves has been…
Flavonoids from Astragalus propinquus
Systematic phytochemical studies of the dichloromet hane (CH2Cl2) fraction of the aqueous extract of Astragalus propinquus on a C-18 column using a Biotage Flash C hromatography system yielded three…
Two new triterpene esters from the twigs of Brachylaena ramiflora from the Madagascar rainforest.
- V. S. Chaturvedula, J. K. Schilling, J. Miller, R. Andriantsiferana, V. Rasamison, D. Kingston
- ChemistryJournal of natural products
- 12 July 2002
Bioassay-guided fractionation of a CH(2)Cl(2)/MeOH extract of the small twigs of Brachylaena ramiflora var. ramiflora resulted in the isolation of the two new triterpene esters 1 and 2 and five known…
New lupane triterpenoids from Solidago canadensis that inhibit the lyase activity of DNA polymerase beta.
A New Diterpene Glycoside from Stevia rebaudiana
From the commercial extract of the leaves of Stevia rebaudiana, a new diterpene glycoside was isolated besides the known steviol glycosides including stevioside, rebaudiosides A-F, rubusoside and…
Stability of rebaudioside A under acidic conditions and its degradation products
Cytotoxic diterpenes from Cassipourea madagascariensis from the Madagascar rainforest.
Bioassay-directed fractionation of ethanol extracts of the roots and leaves of the plant Cassipourea madagascariensis resulted in the isolation of the two new terpenoids cassipourol and cassipouryl acetate, which showed moderate cytotoxic activity, while the three known compounds were weakly active.
New cytotoxic coumarins and prenylated benzophenone derivatives from the bark of Ochrocarpos punctatus from the Madagascar rainforest.
Bioassay-guided fractionation of a CH2Cl2-MeOH extract of the bark of Ochrocarpos punctatus resulted in the isolation of seven new coumarins, ochrocarpins A-G (1-7), three new benzophenone…
Additional Minor Diterpene Glycosides from Stevia rebaudiana
From the commercial extract of the leaves of Stevia rebaudiana, two additional new diterpenoid glycosides were isolated and their structures were characterized as ent-kaur-16-en-19-oic acid β-D-glucopyranosyl ester.