cytellin and syringic-acid

To study the chemical constituents of stalk form Pottsia laxifora.. The chemical constituents were isolated by various chromatography methods,and the structures were elucidated by spectroscopic methods,physical and chemical properties.. Twelve compounds were isolated and their structures were identified as β-sitosterol( 1),salicylic acid( 2),resorcinol( 3),4-hydroxybenzoic acid( 4),protocatechuic acid( 5),vanillic acid( 6),syringic acid( 7),scopoletin( 8),cleomiscosin D( 9),( +)-lyoniresinol( 10),(-)-loliolide( 11) and daucosterol( 12).. Compounds 1 ~ 11 are isolated from this plant for the first time.

Topics: Coumarins; Gallic Acid; Hydroxybenzoates; Magnoliaceae; Scopoletin; Sitosterols; Vanillic Acid

To study the non-alkaloid chemical constituents of Macleaya cordata.. Alcohol extraction and liquidliquid partitionmethods were used to extract the chemical constituents. Silica gel,reverse-phase octadecylsilyl( ODS), and Sephadex LH-20 column chromatographic methods were applied for isolation and purification. Spectroscopic methods including MS and NMR were used to determine their structures.. Eleven non-alkaloid compounds were isolated from the fruits of Macleaya cordata, and their structures were identified as 3-( 3,4-dihydroxy) phenylpropanoic acid methyl ester( 1),ferulic acid( 2),1-octacosanol( 3),syringic acid( 4),p-hydroxy-benzoic acid( 5),p-coumaric acid( 6),quercetin-3-O-β-D-glucoside( 7),N-p-coumaroyl tyramine( 8),10-eicosenoic acid( 9) and β-sitosterol( 10) and daucosterol( 11).. Compounds 1,3 ~9 are isolated from Macleaya cordata for the first time.

Topics: Alkaloids; Coumaric Acids; Gallic Acid; Glucosides; Papaveraceae; Quercetin; Sitosterols; Tyramine

A phytochemical study of Ficus thonningii has led to the isolation of two previously unreported compounds, thonningiiflavanonol A and thonningiiflavanonol B together with 16 known compounds: shuterin, naringenin, syringic acid, p-hydroxybenzoic acid, genistein, 5,7,3',4',5'-pentahydroxyflavanone, luteolin, methylparaben, aromadendrin, garbanzol, dihydroquercetin, 5,7,3'-trihydroxyflavanone, β-sitosterol, sitosterolglucoside, lupeol acetate, and taraxerol. Their structures were elucidated on the basis of spectroscopic data. The new compounds and extracts displayed potent antioxidant activity.

Topics: Antioxidants; Ficus; Flavanones; Flavonoids; Gallic Acid; Genistein; Luteolin; Magnetic Resonance Spectroscopy; Molecular Structure; Oleanolic Acid; Parabens; Plant Bark; Plant Extracts; Plant Roots; Plant Stems; Quercetin; Sitosterols

To investigate the chemical constituents from Scrophularia ningpoensis root.. The compounds were isolated and purified by silica gel and Sephadex LH-20 column chromatography. The structures of these compounds were elucidated on the basis of spectroscopic analysis.. Eleven compounds were isolated and identified as vanillin (1), eugenol (2), isoeugenol methyl ether(3), ferulic acid(4), benzoic acid(5), syringic acid(6) ,rhamnopyranosyl vanilloyl(7), syringic acid-4-O-alpha-L-rhamnopyr-anoside(8), beta-sitosterol(9), adenosine (10) and dibutyl phthalate(11).. Compound 1-3 and 6-8 are obtained from this plant for the first time.

Topics: Chromatography, Liquid; Gallic Acid; Plant Roots; Scrophularia; Sitosterols

The haze episodes that occurred in Malaysia in September-October 1991, August-October 1994 and September-October 1997 have been attributed to suspended smoke particulate matter from biomass burning in southern Sumatra and Kalimantan, Indonesia. In the present study, polar organic compounds in aerosol particulate matter from Malaysia are converted to their trimethylsilyl derivatives and analyzed by gas chromatography-mass spectrometry in order to better assess the contribution of the biomass burning component during the haze episodes. On the basis of this analysis, levoglucosan was found to be the most abundant organic compound detected in almost all samples. The monosaccharides, alpha- and beta-mannose, the lignin breakdown products, vanillic and syringic acids and the minor steroids, cholesterol and beta-sitosterol were also present in some samples. The presence of the tracers from smoke overwhelmed the typical signatures of emissions from traffic and other anthropogenic activities in the urban areas.

Topics: Air Pollution; Biomass; Cholesterol; Gallic Acid; Gas Chromatography-Mass Spectrometry; Glucose; Incineration; Malaysia; Mannose; Sitosterols; Smoke; Trimethylsilyl Compounds; Vanillic Acid