gamma-sitosterol and pinocembrin

Phytochemical analysis of the rhizome extract of Curcuma ecalcarata, a hitherto uninvestigated south Western Ghats endemic species, resulted in the isolation and identification of the diaryl heptanoid trans, trans-1,7-diphenyl-5-hydroxy-4,6-heptadiene-3-one (1), steroid β-sitosterol (2), flavanone pinocembrin (4) and monoterpenoids piperitenone (3) and 8-hydroxy piperitone (5). HPTLC estimation of pinocembrin in the rhizome revealed the plant as a rich source of pinocembrin (0.37% dry wt.). The rhizome essential oil was isolated by hydrodistillation and analysed by GC-FID, GC-MS and (13)C NMR. Among the 30 constituents identified in the oil, monoterpenoids predominated (94.2%) followed by sesquiterpenoids (5.8%). The major compound consisting of 65.2% of the oil was isolated and identified as piperitenone (3). The study highlights the plant as a rich source of the flavanone pinocembrin and the volatile aroma compound piperitenone.

Topics: Curcuma; Cyclohexane Monoterpenes; Flavanones; Gas Chromatography-Mass Spectrometry; Magnetic Resonance Spectroscopy; Molecular Structure; Monoterpenes; Oils, Volatile; Plant Extracts; Plant Oils; Rhizome; Sitosterols; Volatile Organic Compounds

To study the chemical constituents from the ethanolic extract of Alpinia katsumadai Hayata.. The compounds were separated with the column chromatographic, and their structures were identified by chemical and spectroscopic methods.. Eight compounds were isolated from the ethanol extract. On the basis of their physical and chemical properties and spectroscopic analysis, the structures of seven compounds were identified. They were 1,7-Diphenyl-5-hydroxy-4, 6-heptadien-3-one(I), 1,7-Diphenyl4, 6-heptadien-3-one(II), Pinocembrin (III), Cardamomin (IV), Alpinetin (V), 7,4'-Dihydroxy-5-methoxy flavanones(VI) and beta-Sitosterol(VIII), respectively.. Compounds I , II and VII are separated from this plant for the first time. Compounds I and II are also obtained from this genus of Alpinetin for the first time.

Topics: Chalcones; Flavanones; Plants, Medicinal; Seeds; Sitosterols; Spectrophotometry, Ultraviolet; Zingiberaceae