Showing papers on "Triterpene published in 1982"
TL;DR: The structures of two new bitter triterpenes, ganoderic acid A and B, isolated from a mushroom Ganoderma lucidum (FR.) Karst, were determined as 1 and 2 on the basis of spectral data as mentioned in this paper.
Abstract: The structures of two new bitter triterpenes, ganoderic acid A and B. isolated from a mushroom Ganoderma lucidum (FR.) Karst. (Polyporaceae) were determined as 1 and 2 on the basis of spectral data. Ganoderic acid A is a novel highly oxidized triterpene bearing a boat-shaped A-ring of lanostane.
131 citations
TL;DR: The relative retention times and the methylene unit values of 168 acetate derivatives of sterols and triterpene alcohols, most of which are of higher plant origin, were determined on OV 1 and OV 17 glass capillary columns.
114 citations
TL;DR: As part of ongoing studies of the medicinal aspects of Maritime flora, particularly the herbal remedies of the Micmac and Malecite Indians, the sterols and triterpenes of Achillea millefolium L. (Compositae), a widely used herbal remedy, were determined using modern techniques.
40 citations
TL;DR: It has been demonstrated that yeast and tumor cells display a comparable sensibility to the action of triterpene oligosides of sea cucumbers, and gram-positive and Gram-negative bacteria are not sensible to theaction of glycosides in doses to 500 mkg/ml.
36 citations
TL;DR: Lansioside A, a triterpene amino-sugar glycoside, was isolated from Lansium domesticum and its full structure including absolute configuration was established by the chemical derivation and spectral study as mentioned in this paper.
32 citations
TL;DR: The nature of the sterols and triterpenes of Tanacetum vulgare L. (Compositae), a widely used herbal remedy usually referred to as tansy, are determined by using thin layer and gas chromatographics, nuclear magnetic resonance (NMR) spectroscopy and combined gas chromatography-mass spectrometry.
Abstract: Plant sterols and triterpenes exhibit a wide range of pharmacological activities. As part of our ongoing studies of the medicinal aspects of Maritime flora, particularly the herbal remedies of the Micmac and Malecite Indians, we determined the nature of the sterols and triterpenes ofTanacetum vulgare L. (Compositae)—a widely used herbal remedy usually referred to as tansy. By using thin layer and gas chromatographics, nuclear magnetic resonance (NMR) spectroscopy and combined gas chromatography-mass spectrometry, we were able to identify β-sitosterol as the major sterol and α-amyrin as the major triterpene of tansy. We also identified the sterols stigmasterol, campesterol and cholesterol, and the triterpenes β-amyrin and taraxasterol. A fourth triterpene was tentatively identified as pseudo-taraxasterol. The successful therapeutic application of this herb may be due partly to the presence of one or more of these compounds. The sterols and triterpenes of tansy have not been previously reported; neither, to our knowledge, have the NMR spectra of the amyrins and the NMR and mass spectra of taraxasterol.
32 citations
TL;DR: The secondary metabolises of Vismia guaramirangae were isolated from the bark and exudate of the leaves of the tree and the structures of a new anthraquinone, 2-isoprenylemodin, and a new lignan, 5,5′-dimethoxysesamin, were established on the basis of chemical and spectroscopic evidence as mentioned in this paper.
30 citations
TL;DR: Two triterpene glycosides, a diglycoside (as the corresponding methyl ester) and a bis-desmoside were isolated from leaves of Ilex cornuta as mentioned in this paper.
21 citations
TL;DR: From oleoresin of Aucoumea klaineana Pierre, five triterpenes are isolated; one pentacyclic triterpene: alpha-amyrin and four tetracyclIC triter penes: masticadienediol which seems to be new in this family.
Abstract: From oleoresin of Aucoumea klaineana Pierre, five triterpenes are isolated; one pentacyclic triterpene: alpha-amyrin and four tetracyclic triterpenes: masticadienediol which seems to be new in this family, 3alpha-hydroxytirucalla-8,24-dien-21-oic acid, 3 alpha-hydroxytirucalla-7,24-dien-21-oic acid which have been already isolated in some Burseraceae and 3-oxotirucalla-7,24-dien-21-oic acid which seems to be a new triterpene.
21 citations
TL;DR: In this article, NMR techniques were used to gather more chemical shift and coupling information on the pentacyclic triterpene, lupane, and confirm and complete 13C assignments made earlier, and corroborate the constitution and major configurational details.
Abstract: 2D NMR techniques (J-resolved 13C, 13C13C correlated, 1H13C correlated) were used to gather more chemical shift and coupling information on the pentacyclic triterpene, lupane They confirm and complete 13C assignments made earlier, and corroborate the constitution and major configurational details of lupane Lupane is a parent compound and spectral reference in the study of sedimental demethylated triterpenes
21 citations
TL;DR: In this paper, the percentage of saponins in garlic, onion and leek was determined, applying the densitometric method on thin layer chromatograms, previously proposed5.
Abstract: From plant material (Allium sativum, Allium cepa, Allium porrum), extracts characterised by a high haemolytic activity were obtained. In the raw saponin preparation the percentage of saponins in garlic, onion and leek was determined, applying the densitometric method on thin layer chromatograms, previously proposed5. Purified crystalline or oil-like saponin preparations were hydrolysed or complexed with cholesterol. The isolated sapogenins were identified by mass spectrometry, IR, NMR and UV analysis. The following sapogenins were found: sitosterol, gitogenin, oleanolic acid and amyrin.
TL;DR: The use of combined GC/MS proved extremely valuable in the simultaneous analysis of a mixture of triterpene acetates and greatly reduced the time needed to phytochemically evaluate these compounds.
Abstract: Sonchus arvensis L. or sow thistle has proved an excellent source of pentacylic triterpenes; triterpenes account for about 6% of the crude lipid extract or 0.2% of the dried plant. Composition of the triterpenoid fraction, as indicated by gas chromatography of the corresponding acetates, was α-amyrin (9%), β-amyrin (21%), lupeol (13%), taraxasterol (24%) and pseudo-taraxasterol (12%). A single, long-chain alcohol (16%) was also present. The nature of the triterpenoids was defined using gas chromatography and gas chromatography-mass spectrometry (GC/MS) and confirmed by direct comparison with authentic samples. The use of combined GC/MS proved extremely valuable in the simultaneous analysis of a mixture of triterpene acetates and greatly reduced the time needed to phytochemically evaluate these compounds.
TL;DR: This study supports the interpretation that the pattern of triterpene synthesis in the laticifer of the normal plant is a highly controlled and stable phenomenon among varieties of this species.
TL;DR: A quantitative triterpene analysis was made of latex stem tissue of Euphorbia lathyris, where young plants seedlings were incubated with various labelled precursors as mentioned in this paper.
TL;DR: Isomultiflorenol was the major component accompanied by its Δ17-isomer, multilorenol, in the triterpene alcohol fractions of the unsaponifiable as discussed by the authors.
TL;DR: In this article, the structures of triterpene glycosides from Bryonia dioica have been shown, on the basis of chemical and FDMS and 1 H and 13 C NMR s.
TL;DR: Periandrin III, a new triterpene glycoside of the roots of Pepiandra dulcis, has been shown to possess the structure 3-β-O-[β- d -g.
TL;DR: In this article, a general method for selective oxygenation of C-4-Me in triterpenes, leading finally to 4α-carboxyl/4α-hydroxymethyl functionalities, is described.
TL;DR: The petrol extract of the whole plant (aerial parts and roots) of Salvia lanata yielded a new triterpene acid, 3-epi-ursolic acid as discussed by the authors.
TL;DR: Athrixia elata afforded, in addition to known compounds, a new seco-labdane derivative and a new triterpene as mentioned in this paper, which is known as Seco-Labdane.
TL;DR: The structure of the triterpene rigidenol has been revised to 11α-hydroxy-lup-20(30)-en-3-one.
TL;DR: Triterpene quinone-methides, lupenone, β-amyrin, dulcitol, and sitosterol have been isolated from the timber, root and leaf extracts of Gymnosporia emarginata as discussed by the authors.
TL;DR: The structure of Betulafolienetetraol oxide has been established by X-ray analysis as 20(S),24(R)-epoxydammar-3-α,12β,17α,25-tetraOL as discussed by the authors.
TL;DR: In this paper, Saponin E and H were separated by droplet countercurrent chromatography and the complete molecular configurations of both glycosides were determined to be 3-O-(2-O-α-L-R-rhamnopyranosyl-β-D-glucopyranoyl)hovenolactone and 3.
Abstract: Saponin E, isolated from the leaves of Hoevenia dulcis, afforded a new dammarane triterpene aglycone, hovenolactone, on treatment with naringinase. The structure of hovenolactone, including the relative configurations at C-17, C-20, and C-23, was established by chemical and spectroscopic investigations as well as by X-ray analysis. Saponins E and H were separated by droplet counter-current chromatography. The complete molecular configurations of both glycosides were determined to be 3-O-(2-O-α-L-rhamnopyranosyl-β-D-glucopyranosyl)hovenolactone and 3-O-β-D-glucopyranosylhovenolactone, respectively, by 13C n.m.r. spectroscopy.
TL;DR: Astragalus taschkendicus C. Bge has been isolated from the roots of the plant, and on the basis of chemical transformations and spectral characteristics its structure has been established as 24(R)-cycloartane-3β,6α,16β,24,25-pentaol as discussed by the authors.
Abstract: A new isoprenoid — cycloasgenin C — has been isolated from the roots of the plantAstragalus taschkendicus C. Bge, and on the basis of chemical transformations and spectral characteristics its structure has been established as 24(R)-cycloartane-3β,6α,16β,24,25-pentaol.
TL;DR: The structures of two new bitter triterpenes, ganoderic acid A and B, isolated from a mushroom Ganoderma lucidum (FR.) Karst, were determined as 1 and 2 on the basis of spectral data as mentioned in this paper.
Abstract: The structures of two new bitter triterpenes, ganoderic acid A and B. isolated from a mushroom Ganoderma lucidum (FR.) Karst. (Polyporaceae) were determined as 1 and 2 on the basis of spectral data. Ganoderic acid A is a novel highly oxidized triterpene bearing a boat-shaped A-ring of lanostane.
TL;DR: In this article, the fresh leaves of Fatsia japoniea (Thunb.) Decne et Planch., family Araliaceae (Japan fatsia) cultivated in the Georgian SSR Black Sea littora contain weakly polar, and the air-dry leaves more strongly polar, glycosides.
Abstract: We have previously reported that the fresh leaves of Fatsia japoniea (Thunb.) Decne et Planch., family Araliaceae (Japan fatsia) cultivated in the Georgian SSR Black Sea littora contain weakly polar, and the air-dry leaves more strongly polar, glycosides. In the fresh leaves by TLC in systems with various pH values at least four weakly polar compounds were detected [i] -fatsiasides AI, BI, CI, and D 1 -and we give information on the study of their structures below.
01 Feb 1982
TL;DR: In this paper, the dynamics of 14C incorporation of D-glucose-U-14C, acetate-1 14C and mevalonate-2 14C into esterified triterpenes and cardenolides in excised stem parts were studied.
Abstract: SUMMARY
The latex of Asclepias curassavica L. was shown to contain 40–60 mg.ml–1 cardenolides and 0.4–0.6 mg.ml–1 esterified triterpenes. The dynamics of 14C incorporation of D-glucose-U-14C, acetate-1-14C and mevalonate-2-14C into esterified triterpenes and cardenolides in excised stem parts have been studied. The results obtained indicate that glucose is a very effective precursor in latex triterpene synthesis. The three precursors used were only slightly involved in cardenolide synthesis. The results are discussed in relation to the view that both latex constituents probably have different sites of synthesis.
TL;DR: Two new glycosides, cyclosieversiosides A and C, have been isolated from the roots of Astragalus sieversianus Pall as discussed by the authors, which are derived from the same root.
Abstract: Two new glycosides, cyclosieversiosides A and C, have been isolated from the roots ofAstragalus sieversianus Pall.Cyclosieversioside A is cyclosieversigenin 3-0-(2′,3′-di-0-acetyl-β-D-xylopyranoside) 6-0-β-D-xylopyranoside. Cyclosieversioside C is cyclosieversigenin 3-0-(2′-0-acetyl-β-D-xylopyranoside) 6-0-β-D-xylopyranoside.