Showing papers in "Phytochemistry in 1983"

TL;DR: In this article, resonance Raman spectroscopy was successfully applied to both aqueous anthocyanin solutions and to living tissues containing these pigments, which is probably the most efficient mean of protecting the flavylium cation against these compounds.

TL;DR: The outer wall of the green alga Botryococcus braunii (main sites of hydrocarbon production and accumulation) show a complex constitution as mentioned in this paper, which comprises a biopolymer highly resistant to non-oxidative degradation.

TL;DR: The monomeric composition of the suberins from 16 species of higher plants was determined by chromatographic methods following depolymerization of the isolated extractive-free cork layers with sodium methoxide-methanol.

TL;DR: Chromenes (benzopyrans) and benzofurans are characteristic natural products of certain tribes of the Asteraceae and a review of recent findings can be found in this article.

TL;DR: 6-Methoxymellein was identified as a common phytoalexin produced by carrot roots irrespective of the species of challenging fungi and it was shown that cultured carrot cells produced 6-methoxcyellein when the culture was inoculated with fungi.

TL;DR: In this article, the spectra of 151 flavonoids were measured in methanol alone and with added aluminium chloride and hydrochloric acid, and they were divided into two classes according to the shape of band I (single or double peak).

TL;DR: In this article, a linear furocoumarin phytoalexin response was observed in stressed celery (Apium graveolens) in a controlled setting.

TL;DR: In this paper, three new bibenzyls and two dihydrophenanthrenes, which exhibit antimicrobial activity, were isolated from tubers of Bletilla striata.

TL;DR: The products of the in vitro system are identical with the major GAs found endogenously in immature pea seeds and the sequences obtained are considered representative of the natural biosynthetic pathway of GAs in many plant species.

TL;DR: The cell walls of representatives of the genera Chlorella, Monoraphidium, Ankistrodesmus and Scenedesmus contained 24–74% neutral sugars, 1–24% uronic acids, 2–16% protein and 0–15% glucosamine.

TL;DR: The ascorbic acid (vitamin C) content of the leaves of 213 angiosperm species is recorded and the nutritional and taxonomic significance of the results is revealed.

TL;DR: The rate of release of ammonia from leaf tissues of Glycine max and Triticum aestivum suspended in urea solutions was relatively low for initial periods of up to 40 min, due to retention of ammonia by the tissues.

TL;DR: The MW profiles of proanthocyanidin polymers (condensed tannins) from 32 samples representing a wide range of plant tissues of many different species have been obtained by gel permeation chromatography of the peracetate derivatives.

TL;DR: The plant growth-promoting activities of brassinolide and brassinosteroids with different side chains were investigated by means of the Raphanus an.

TL;DR: DIBOA and DIMBOA had toxic and feeding deterrent effects on the greenbug Schizaphis graminum at concentrations similar to those found in both cultivated and wild Gramineae.

TL;DR: Levels of lipid fluidity of carnation microsomal membranes decreases during in vitro aging in a manner that correlates with enzymatic production of superoxide anion by the membranes, and microsomes from senescent flowers produce more (O 2 − dot ), suggesting that this reactive species of oxygen also contributes to membrane rigidification during natural senescence.

TL;DR: The water-ethanol extracts of the cultured mycelia of 17 species of Cordyceps and six species of Isaria were each examined for the presence of carbon dioxide.

TL;DR: From the dried rhizomes of Polypodium niponicum and P. formosanum, 16 hydrocarbons, three alcohols, five acetates, one epoxide and two ketones of pentacyclic triterpenoids belonging to the hopane, neohopane, fernane, trisnorhopane, oleanane, taraxerane, multiflorane, friedelane and taraxastane groups were isolated and characterized.

TL;DR: HPLC analysis allowed a good separation between the new trisaccharide and manninotriose showing that the latter was absent in chickpea and in the other legume seeds under study, and the name ciceritol is proposed.

TL;DR: Five new compounds have been isolated from the black rhizomes of Boesenbergia pandurata by isolatinghydroxy-3,7,3′,4′-tetramethoxyflavone and 5,7-dimethoxyfiavone.

TL;DR: Four new tetranortriterpenes, meliatoxins A1, A2, B1 and B2 have been isolated and identified as toxic constituents of the fruit of Melia azedarach L. var.

TL;DR: The biogenetic pathways leading to the characteristic steroids of the Solanaceae are reviewed and their metabolism as well as biosynthesis are considered.

TL;DR: In this article, Schistostephium species were used to identify 43 new compounds, including isocomene, bisabolene, eudesmane and nerolidol derivatives, and a prostaglandin-like acid.

TL;DR: The cell walls from cotyledons of smooth field pea, broad bean and soya bean contain ca 55% pectic polysaccharides associated with 9% cellulose as discussed by the authors.

TL;DR: In this paper, an investigation of the bark of Myrica rubra has led to the isolation and characterization of myricatin and four new galloyl prodelphinidin dimers, together with gallic acid, (±)-gallocatechin and 3- O -galloyl-(−)-epicatechin.

TL;DR: Hydrolysis of galactomannan in endosperms of germinating guar is due to the combined action of three enzymes, α-galactosidase, β-mannanase and exo-β-mannAnase, and results obtained indicated that these three activities are sufficient to account for galactOMannan degradation in vivo.

TL;DR: In this paper, seven aromatic compounds have been obtained from the dried bark of Cinnamomum cassia: lyoniresinol 3α- O -β- D -glucopyranoside, 3,4,5-trimethoxyphenol β-D -apiofuranosyl, (±)-syringaresinol, two epicatechin derivatives and two cinnamic aldehyde cyclic glycerol 1,3-acetals.

TL;DR: In this paper, a model fermentation system has been designed which utilizes pure catechins and partially purified polyphenol oxidase (EC 1.14.18.1) from green tea leaves.

TL;DR: Cell suspension cultures of Syringa vulgaris accumulate up to 16% of their dry wt as a mixture of hydroxyphenylethanol glycosides, the main component is the caffeoyl ester, verbascoside (acteoside), which Tyrosine and tyramine are efficient biosynthetic precursors of the 4-hydroxy- and 3,4-dihydroxyphethanol moieties of these glycoside.

TL;DR: The methanolic extract from the root of Carissa edulis contains ca 5% lignans, the main compounds among them being (−)-nortrachelogenin, carinol and the hitherto unknown carissanol.