Showing papers on "Triterpene published in 1979"
TL;DR: The structure of arjunglucoside III, isolated from Terminalia arjuna, was found to be β-D-glucopyranosyl 2α,3β,19α-trihydroxy-11-oxoolean-12-en-28-oate.
Abstract: The structure of a new triterpene glucoside, arjunglucoside III, isolated from Terminalia arjuna was found to be β-D-glucopyranosyl 2α,3β,19α-trihydroxy-11-oxoolean-12-en-28-oate.
25 citations
TL;DR: In this article, the contents of individual free and ester-bound triterpene alcohols and sterols as well as the fatty acid components of the ester form were determined.
22 citations
TL;DR: A new saponin has been isolated from a tropical plant Chrysantellum procumbens Rich which is thought to be useful in the therapy of digestive troubles.
Abstract: A new saponin has been isolated from a tropical plant Chrysantellum procumbens Rich, which is thought to be useful in the therapy of digestive troubles. The structure of this saponin was determined by chemical methods, nuclear magnetic resonance and mass spectrometry. The aglycone moiety is a triterpene, echinocystic acid; d-glucose, d-xylose and l-rhamnose are carbohydrate components. The structure of saponin was established as 3-O-β-d-glucopyranosyl [l-rhamnopyranosyl-(α1 3)-d-xylopyranosyl-(β1 4)-l-rhamnopyranosyl-(α1 2)-d-xylopyranosyl]-(α1 28)-echinocystyl. The name, chrysantellin A, is proposed for this new saponin.
20 citations
16 citations
TL;DR: In this paper, the structural elucidation of obtusilobinin (Oblibin) and Obliboxilobin (OBIN) has been carried out from the ethanolic extract of Anemone obtsiloba.
11 citations
Journal Article•
TL;DR: Antifungal activity was tested in 49 pentacyclic triterpenoids and their glycosides, of plant and semisynthetic origin, and several of these compounds inhibited the multiplication of the yeast Saccharomyces carlsbergensis.
Abstract: Antifungal activity was tested in 49 pentacyclic triterpenoids and their glycosides, of plant and semisynthetic origin. Several of these compounds inhibited the multiplication of the yeast Saccharomyces carlsbergensis. The highest antifungal activity was found in the triterpene glycosides oleanolic acid and hederagenin, which have a free carboxyl group at C 28(27). Triterpenes of the meristotropic acid, macedonic acid, and lupan types had no fungistatic activity at concentrations up to 100 microgram/ml.
9 citations
TL;DR: Two triterpene acids were isolated from the plant Cornulaca monacantha DEL and assigned the structure 3β, 6α-dihydroxyolean-12-en-27, 28-dioic acid I and named azizic acid as discussed by the authors.
Abstract: Two new triterpene acids were isolated from the plant Cornulaca monacantha DEL. The first acid was assigned the structure 3β, 6α-dihydroxyolean-12-en-27-oic acid I and was given the trivial name manevalic acid. The other compound was assigned the structure 3β, 6α-dihydroxyolean-12-en-27, 28-dioic acid II and named azizic acid. These assignments were based on spectral and chemical studies. The chemical correlation between manevalic acid and the known triterpene astilbic acid, 3β, 6β-dihydroxyolean-12-en-27-oic acid, was established through oxidation of their methyl esters to methyl 3, 6-dioxoolean-12-en-27-oate IC.
8 citations
TL;DR: Salaspermic acid, a triterpene acid isolated from Salacia macrosperma Wight, has been shown to be 24-hydroxy-3-oxofriedelan-29-oic acid hemiacetal (IIIa) on the basis of spectral and chemical properties as mentioned in this paper.
Abstract: Salaspermic acid, a new triterpene acid isolated from Salacia macrosperma Wight, has been shown to be 24-hydroxy-3-oxofriedelan-29-oic acid hemiacetal (IIIa) on the basis of spectral and chemical properties. The structure has been confirmed by an X-ray study of compound (VII) obtained from the acid by a sequence involving the enlargement of ring E.
7 citations
TL;DR: From the neutral fraction of the acid hydrolysate of the saponin of Acacia concinna pods, acacic acid lactone 3β-acetate and a new nor-triterpene "acacidiol" have been isolated as mentioned in this paper.
6 citations
TL;DR: The structure of a triterpene acid from the roots of Bryonia dioica was shown on the basis of chemical and spectroscopic evidence to be 3α-hydroxy-multiflora-7,9(11)-dien-29α-oic acid as mentioned in this paper.
6 citations
TL;DR: A new triterpene glycoside — acanthophylloside D — has been isolated from the roots of Canthophyllum gypsophiloides Rgl.
Abstract: A new triterpene glycoside — acanthophylloside D — has been isolated from the roots ofAcanthophyllum gypsophiloides Rgl. It is a decaoside of quillaic acid containing O-glycosidic and O-acylosidic carbohydrate chains identical in structure with the analogous fragments of acanthophylloside B.
TL;DR: Two triterpene glycosides (caulosides b and c) from a methanolic extract of the leaves ofCaulophyllum robustum maxim have been identified.
Abstract: Two triterpene glycosides — caulosides b and c — have been isolated from a methanolic extract of the leaves ofCaulophyllum robustum maxim. Cauloside b has been identified as hederagenin 3-α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranoside, while cauloside c has the structure of hederagenin 3-0-α-L-arabinopyranosyl(1→3)-α-L-pyranosyl-(1→2)-α-L-arabinopyranoside.
Journal Article•
TL;DR: It was found that the triterpene glycosides stimulated the leakage of the UV-absorbing substances with an absorption maximum at 260 nm from the cells, and the maximum membranotropic effect was observed at 30--40 degrees C and in the presence of monovalent potassium, sodium, ammonium and lithium ions in the medium.
Abstract: The effect of triterpene glycosides of cauloside C from Caulophyllum robustum M, stichoposide A from Stichopus japonicus S. and theasaponine from Thea sinensis Z. on permeability of plasmic membranes of Saccharomyces carlsbergensis for UV-absorbing substances was studied. It was found that incorporation of 14C-uridine from the endocellular pool into the yeast acid-insoluble fraction decreased under the effect of the triterpene glycosides as a result of the precursor leakage from the cell into the medium. It was found that the triterpene glycosides stimulated the leakage of the UV-absorbing substances with an absorption maximum at 260 nm from the cells. The maximum membranotropic effect was observed at 30--40 degrees C and in the presence of monovalent potassium, sodium, ammonium and lithium ions in the medium. Cauloside C and theasaponine, pentacyclic glycosides had the highest effect on the permeability at pH 4.8--5.6, while stichoposide A, a tetracyclic glycoside, had the highest effect at pH 7.0.
TL;DR: Partial syntheses of glycosides of oleanolic acid are described in this article, including the 3.0-β-D-xylopyranoside (songoroside A), the 3,28-bis-0,β-d-xynoside, and the 28-0 -β-gentiobioside-3.
Abstract: Partial syntheses of glycosides of oleanolic acid — the 3-0-β-D-xylopyranoside (songoroside A), the 3,28-bis-0-β-D-xylopyranoside, and the 28-0-β-gentiobioside-3-0-β-D-xylopyranoside — and also the formation of 3-0-β-D-xylopyranosyloleanolic acid 13,28-lactone are described.
Journal Article•
TL;DR: It was found that saponins inhibited the fungal growth to different extents and had no activity against grampositive and gramnegative bacteria.
Abstract: Antimicrobial activity of 9 triterpene glycosides of the plant and animal origin was studied. It was found that saponins inhibited the fungal growth to different extents and had no activity against grampositive and gramnegative bacteria. Triterpene glycosides of the animal origin, i.e. holoturins A and B, stichoposids A and C had the most pronounced antifungal activity as compared to the saponins isolated from plants. Changes in the length of the carbon chain from 2 to 6 monosugars had no significant effect on the activity of the triterpeneglycosides studied.
TL;DR: In this article, the results of an investigation of the saponins of the epigeal part of Z. obliqu~ collected in July, 1975 in the Boom gorge, Issyk-Kul' oblast, in the fruit-bearing phase were given.
Abstract: In the present communication we give the results of an investigation of the saponins of the epigeal part of Z. obliqu~ collected in July, 1975 in the Boom gorge, Issyk-Kul' oblast, in the fruit-bearing phase. The saponins were extracted with ethanol from the raw material that had previously been treated with chloroform. The isolated total saponins, according to TLC on silica gel in butan-l-ol--formic acid--water (4:1:5) and chl0roform-methanol-water (65:30:6.5) systems contained six glycosides of triterpene nature which we have called, in order of increasing polarity glycosides A, B, C, D, E, and F.