Showing papers in "Phytochemistry in 1995"

TL;DR: The alkaloid composition of 56 species of the genus Lupinus was studied by capillary gas-liquid chromatography and GLC-mass spectrometry and their relative abundances in leaves and seeds are recorded.

TL;DR: It is proposed that uncommon acids, some typical acids and the ratio of acids are useful chemotaxonomic markers.

TL;DR: In this article, cross-linking of arabinoxylans by ferulate dehydrodimers and incorporation of feruloylated arabinoxideylans into lignin were modelled with maize walls (Zea mays cv Black Mexican) containing 5.3-18.0 mg g−1 of total ferulates.

TL;DR: The recent isolation and characterization of cDNAs and genes coding for enzymes of the shikimate pathway in higher plants have confirmed that plastids are the major, if not only site of aromatic amino acid biosynthesis in plants.

TL;DR: Six new and three synthetically known glycosides have been isolated from the leaves of Moringa oleifera, employing a bioassay-directed isolation method on the ethanolic extract, using 2D NMR techniques.

TL;DR: Oilseed rape plants sprayed with a solution of methyl jasmonate or exposed to methyl jAsmonate vapour accumulated indolyl glucosinolates in their leaves in amounts that depended on the concentration applied, with the predominant components of the response being 3-indolylmethyl- and 1-methoxy-3- Indolyl methyl-glucosinolate.

TL;DR: The results suggest that only those tissues which are developmentally competent to express PPO mRNA are capable of responding to the systemic wounding signal by increased accumulation of PPO RNA.

TL;DR: Four phloroglucinols have been isolated from a petrol extract of the leaves and flowers of Hypericum brasiliense and were antibacterial against Bacillus subtilis in a TLC bioautographic assay.

TL;DR: It is proposed that accumulation of proline is related to non enzymatic detoxification of free radicals that are generated excessively under stress.

TL;DR: This review reflects on changes in technology, new molecules of substantial interest, changing ethical principles for organism collection and heightened awareness of the chemical and biological potential of the tropical rain forests.

TL;DR: Activity-guided investigation of Cyperus rotundus tubers led to the isolation of patchoulenone, caryophyllene alpha-oxide, 10,12-peroxycalamenene and 4,7-dimethyl-1-tetralone, with the novel endoperoxide sesquiterpene, 10%, exhibiting the strongest effect at EC50 2.33 x 10(-6) M.

TL;DR: A shift in flavanol pools from monomeric to oligomeric structures during fruit growth indicated the biosynthetic tendency towards the formation of procyanidins at the end of the growing period.

TL;DR: An efficient production system of peroxidase (POD, EC 1.11.7) in cultured cells of sweet potato is established and three acidic POD isoenzymes (A-1, A-2 and A-3) were purified to homogeneity from suspension-cultured cells by DEAE-cellulose and gel filtration column chromatography.

TL;DR: It is demonstrated that these lipid patterns rich in free fatty acids were relevant to the degradation of complex lipids, and confirmed that the diatom, S. costatum, provides a good diet for molluscs, particularly through its high proportion of eJ3 PUFA.

TL;DR: The close correlation between changes in beta-galactosidase activity, tissue softness, and increased pectin solubility and degradation suggests that beta-GalactOSidase might play an important role in cell wall pectIn modification and softening of mango fruit during ripening.

TL;DR: Three novel compounds, a sesquiterpene, phenyl and biphenyl derivatives, have been isolated from the crude methanol extract of the fungusAntrodia cinnamomea, a new genus of Antrodia species.

TL;DR: A new monogalactosyl diacylglycerol containing (7Z,10Z)-hexadecadienoic acid showed a more potent inhibitory effect toward tumour promotion than the other glycerolipids isolated.

TL;DR: The acyclic homoterpene 4,8-dimethylnona-1,3,7-triene is a metabolite of (3S)-nerolidol and the degree of the enantioselectivity of the converting enzyme was found to be characteristic for the selected plant or the plant cultivar.

TL;DR: Six ent-kaurane diterpenes in the hexane extract of Xylopia aethiopica fruits and an aqueous methanol extract of the seeds were studied for termite antifeedant activity against workers of the subterranean termite, Reticulitermes speratus.

TL;DR: Time course analyses of extracellular metabolites leading up to polymer formation reveal that coniferyl alcohol, but not p-coumaryl alcohol, undergoes substantial coupling reactions to give various lignans, which adds a new perspective to the lignin assembly mechanism.

TL;DR: Five new compounds, viz. 3,4-dimethoxyphenyl 2-O-(3-O-methyl-alpha-L-rhamnopyranosyl)-beta-D-glucopyranuside, 4'-hydroxyphenacyl beta-D -glucobyranoside, 2,3-dihydro-7-hydroxy-2-hydroxymethyl-5-benzofuranpropanol,

TL;DR: The soluble polymers secreted by cell-suspension cultures of Nicotiana plumbaginifolia contained 78% carbohydrate, 6% protein and 4% inorganic material, and these polysaccharides were isolated by selective precipitation and enzymic treatment.

TL;DR: Seven compounds with strong inhibitory activity on platelet aggregation in vitro were isolated from the chloroform-soluble part of the bark of Zanthoxylum schinifolium by bioassay-guided fractionation.

TL;DR: Bioactivity-guided fractionation of the leaves of Selaginella willdenowii afforded three known biflavones, 4',7"-di-O-methylamentoflavone, isocryptomerin and 7"-O-methylrobustaflavone that were significantly cytotoxic against a panel of human cancer cell lines.

TL;DR: Two new withanolides, 14,15 beta-epoxy withanolide I and 17 beta-hydroxywithanolide K, have been isolated from the whole plant of Withania coagulance and their structures were elucidated by spectroscopic techniques.

TL;DR: In this paper, a review of bioorganic chemical aspects of isoflavonoids is presented, focusing on structural modifications and the diverse oxygenated side attachments originating from the isoprenoid substituents.

TL;DR: The purification procedures, molecular features, substrate specificities, inhibitors, the stoichiometry of the catalysed reaction, spectroscopic features, the prosthetic groups and reaction mechanisms, are reviewed.

TL;DR: In this article, an analysis of the flavonol glycoside patterns of 13 Epilobium species was carried out by thermospray liquid chromatography-mass spectrometry (TSP/LC-MS) coupled with a photodiode array detector (LC-UV).

TL;DR: Two structurally related triterpenoids 1 and 2 from pink peppercorn are identified and characterized as active site-directed specific competitive inhibitors of the three classes of secreted 14 kDa phospholipase A2.

TL;DR: Roots of gramineous plants turn deep yellow upon colonization with arbuscular mycorrhizal fungi and methanolic extracts of maize roots show a polyene absorption with maxima at 375 and 395 nm that is not found in the extracts of controls.