Showing papers in "Phytochemistry in 1996"

TL;DR: In this article, the degradation products released by thioacidolysis of a grape (Vitis vinifera var. Merlot) skin extract were analyzed by reverse-phase HPLC after thio acidolysis.

TL;DR: A system for the classification of essential oil chemotypes in O. basilicum is proposed because of the chemical heterogeneity of this taxon and its use as an essential oil-producing crop, culinary herb, medicinal plant and insect-controlling agent, in which chemicals play an important role.

TL;DR: Aqueous acetone extracts of shoots of Eurasian watermilfoil exhibit a strong inhibitory action against various coccoid and filamentous cyanobacteria and to a slightly less extent against chlorophytes and diatoms.

TL;DR: In this paper, (+)-Catechin oxidation was carried out in aqueous systems using grape polyphenoloxidase as catalyst and two yellow pigments were identified.

TL;DR: The triterpene alcohols from Compositae flowers were evaluated with respect to their anti-inflammatory activity against 12-O-tetradecanoylphorbol-13-acetate-induced inflammation in mice and showed marked inhibitory activity.

TL;DR: The major organic constituents of New Zealand sourced propolis have been identified and quantified in tincture solutions by a combination of HPLC and GC-mass spectrometry (MS).

TL;DR: Chicoric acid and the related monocaffeyltartaric acid were found to be the major phenolic constituents in flowers, roots, leaves and involucral bracts and also in the medicinal preparations tested.

TL;DR: The structural variation of isoprenylated flavonoids, including the chalcones, flavones and flavonols, as well as their dihydro derivatives are reviewed in this paper.

TL;DR: The acyphloroglucinol derivatives produced by Eucalyptus species are reviewed and aspects of their chemistry, stereochemistry, biological activity and biogenesis are discussed.

TL;DR: Eleven novel cytotoxic xanthones, gambogin, morellin dimethyl acetal, isomoreollin B, moreollic acid, gambogenic acid,Gambogellic acid and hanburin were isolated from the dry latex of Garcinia hanburyi and the structures were elucidated by a detailed spectroscopic analysis.

TL;DR: The chemical composition of the ripe fruit of Morinda citrifolia, the only larval resource of the specialist species, Drosophila sechellia, was investigated and 51 compounds were abundant enough to be identified by GC-MS.

TL;DR: The chemical structure of the purified proanthocyanidin polymers of Lotus corniculatus was analyzed by 13C NMR and by mild acid catalysed degradation in the presence of excess of phloroglucinol as mentioned in this paper.

TL;DR: The authors showed that γ-p-coumarate esters significantly reduce the yields of syringyl products recovered after thioacidolysis of grass lignins.

TL;DR: These new secondary metabolites are potent cytotoxic inhibitors of the mitochondrial NADH:ubiquinone oxidoreductase (complex I of the respiratory chain) of the Annonaceae.

TL;DR: The most prominent phenolics showing elicitor- or fungus-induced increases in accumulation rates were the soluble putrescine amides and cell wall-bound 4-hydroxybenzaldehyde and tyramine amide.

TL;DR: All naphthoquinones showed antifungal activity against Cladosporium cucumerinum and Candida albicans, and activity against the bacteria Bacillus subtilis and Escherichia coli.

TL;DR: The hitherto undetermined configurations at C-20 and C-22 of pseudojujubogenin were elucidated by phase-sensitive ROESY, and 1H and 13C signals of the saponins were assigned by DEPT, 1H-1H COSY, HSQC and HMBC techniques.

TL;DR: Seven compounds, eugenin, (-)-selinidin, (+)-pteryxin, imperatorin, bergapten, cnidilin and (+)-visamminol, show strong antiplatelet aggregation activity in vitro.

TL;DR: Phytochemical examination of the dichloromethane extract of the European fungus Fomitopsis pinicola led to the isolation of a new lanostanoid derivative identified from spectral and chemical evidences as 3 alpha-acetyloxylanosta++ +-8,24-dien-21-oic acid.

TL;DR: Four novel ergostane-type triterpenoids were isolated from the fruiting body of the fungusAntrodia cinnamomea, a newly identified species of Antrodia, Polyporaceae in Taiwan by spectroscopic methods.

TL;DR: Macromolecular assemblages intimately associated with biogenic silica in plants are released on solubilization of the siliceous phase by treatment with buffered aqueous solutions of HF following treatment of plant material with concentrated oxidizing acids to remove cytoplasmic contents and the largely polysaccharidic cell wall.

TL;DR: In this paper, new covalent adducts have been synthesized upon condensation of synthetic flavylium ions with catechin in the presence and in the absence of acetaldehyde.

TL;DR: DGCC was found to be one of the common constituents of Haptophyceae; it was interesting to note that PC was not detected even as a minor component.

TL;DR: Five clones of Ocimum basilicum hairy roots, A-1 and A-2, and J-1, J-2 andJ-3, grew well in hormone-free Murashige-Skoog, Gamborg B5 and Woody Plant liquid media and in these cultures a large amount of rosmarinic acid was produced.

TL;DR: In this article, the occurrence of ether-linked ferulic acid amides (feruloyltyramine and/or feruloyloctopamine) in suberin-enriched samples of natural and wound periderms of potato tubers was established by thioacidolysis and desulphuration, followed by GC-mass spectrometry of diagnostic dihydroferulo-ltylamine.

TL;DR: Ten antiviral lignans, seven known and three new compounds, were isolated from a methanolic extract of the aerial parts of Justicia procumbens var.

TL;DR: Four new xanthones have been isolated from the roots of Hypericum roeperanum and exhibited antifungal activity against Candida albicans.

TL;DR: It is proposed that during active phenylpropanoid metabolism, the ammonia released by phenylalanine ammonia lyase/tyrosine ammonia Lyase is efficiently recycled back to Phe/Tyr with glutamate serving as aminoreceptor and donor, the first evidence for a novel nitrogen cycle in plants.

TL;DR: The structure-activity relationships of these compounds and their derivatives, the reactivity of benzoxazinoids with nucleophiles, and the substituent effects of the 7-methoxy and 2-hydroxy groups are discussed in relation to the molecular mechanisms of the biological activities.

TL;DR: Polyfunctional polyphenols, with their several chelating o -dihydroxyphenyl groups per molecule, also remove iron(III) from other iron/ligand complexes more efficiently than monofunctional low molecular weight phenols.