Showing papers in "Phytochemistry in 1989"

TL;DR: Of the compatible solutes tested, sorbitol, mannitol, myo-inositol and proline were effective hydroxyl radical scavengers and Glycinebetaine was ineffective.

TL;DR: In this article, the effect of putrescine, spermidine, and spermine on ozone-sensitive tobacco plants was investigated and it was concluded that scavenging of radicals by free polyamines cannot explain the protection against ozone damage observed after exogenous application.

TL;DR: In this article, the distribution of xanthones is examined in relation to the taxonomic divisions of the Guttiferae, and various pharmacological properties of Xanthones are summarized.

TL;DR: Elenolic acid glucoside and demethylolepein are glucosylated derivatives of oleuropein which accumulate during olive ( Olea europaea ) maturation as mentioned in this paper.

TL;DR: Pulse-chase experiments with 35 SO 4 2− fed for 10 min to leaves of Allium cepa (onion), A. sativum (garlic) and 4 A. siculum showed that label appeared in γ-glutamyl peptides within 15 min, reached a maximum amount at 1 hr and had decreased by 6 hr as discussed by the authors.

TL;DR: Biologically active polysaccharides isolated from natural sources during the period January 1977 to December 1988 are reviewed and recent techniques used in their isolation, purification and structure elucidation are discussed.

TL;DR: In this paper, two soluble phenolics have been isolated from Norway spruce needles and their structures elucidated on the basis of chromatographic (TLC, HPLC), chemical (hydrolysis), enzymic and spectroscopic (UV, NMR, MS) techniques.

TL;DR: From a dichloromethane extract and a hydrolysed methanolic extract from the leaves of Psiadia trinervia, 13 3-methylated flavonols have been isolated as discussed by the authors.

TL;DR: The steroidal glycoalkaloids α-solanine and α-chaconine significantly inhibited bovine and human acetylcholinesterase at a concentration of 100 μM, but their effects were not pH dependent.

TL;DR: There was greater diversity in glucoside composition and a higher total amount of glucosides in the twigs than in the leaves and buds, and the traditional classification of Salix species turned out to be inconsistent with a classification based in phenolic glucOSides only.

TL;DR: There is a need to evaluate precisely how sterols and their derivatives control growth and developmental processes to optimise performance of fungicides, herbicides and PGRs and the judicious use of inhibitors of the type described here may help in this undertaking.

TL;DR: In this article, the signal peaks of the protons on oxygen-bearing carbon atoms were analyzed for configurational determination of 2,3-dihydroxy and 2, 3,23- and 2.3,24-trihydroxy substituents in triterpenoids.

TL;DR: In this article, four phenolic compounds and adenosine were isolated from the roots of Coix lachryma-jobi var. ma-yuen, based on spectral evidence and the results of chemical synthesis, the structures of three were determined to be 4-ketopinoresinol, and threo - and erythro -1-C -syringylglycerol.

TL;DR: The optimum conditions for polyphenoloxidase (PPO) extraction from apple fruit were obtained with a buffer solution above pH 7 containing 15 mM ascorbic acid and 05% of Triton X100.

TL;DR: The literature on the history, identification, determination, isolation and distribution in plants of betulin as well as its technological applications and its pharmacology is reviewed and the chemotaxonomy of the angiosperms in relation to betulin is discussed as discussed by the authors.

TL;DR: An antifungal compound has been isolated from tubers of taro inoculated with black rot fungus and identified as 9,12,13-trihydroxy-( E )-10-octadecenoic acid.

TL;DR: Five new hydroxycinnamic acid esters of phenethylalcohol glycosides named jionosides C, D, E, A2 and B2, together with nine known compounds, have been isolated from roots of Rehmannia glutinosa var.

TL;DR: The fungicidal activity of two isoflavones, one isoflavanone and seven is oflavans was tested in malt extract broth against five storage fungi of the genus Aspergillus and the two isOflavans were highly inhibitory to As pergillus.

TL;DR: In this article, four new glucosides, isolated from grapefruit seeds, were identified as limonin 17-O -β-d -glucopyranoside, nomilin 17 O -βd d -glocopyrane, deacetylnomilin and obacunone.

TL;DR: In this article, the isolation and structure elucidation of 15 alkamides from the roots of Echinacea angustifolia was reported, including undeca-2 Z -en-8,10-diynoic acid isobutylamide, dodeca-1 E -en 8,10 -diynocalic acid 2-methylbutylamides, hexadeca-2 E,9 Z -dien-12,14-dimethylamide and dodeca 2 E,4 Z,10 Z -trien-8-

TL;DR: Seedlings of four wheat cultivars were infested with Metopolophium dirhodum nymphs, and after aphids had fed for 40 hr on the plants, the levels of the defense metabolite 2,4-dihydroxy-7-methoxy-1, 4-benzoxazin-3-one had changed.

TL;DR: Clerodane diterpenoid compounds from Teucrium (Labiatae) were assayed for antifeedant activity against larvae of Spodoptera littoralis and Heliothis armigera.

TL;DR: Feeding experiments demonstrate that tyrosine is metabolized to dopamine and p -hydroxyphenylacetaldehyde which then condense to form norcoclaurine, thus explaining the lack of incorporation of DOPA or dopamine into the benzylic portion of reticuline derived alkaloids.

TL;DR: In this article, eight volatile 1,4-naphthoquinones from acetone extracts of unripe black walnut and English walnut (Juglans regia) fruit were identified by gas chromatography-mass spectrometry assisted by 1H NMR.

TL;DR: The evidence suggests that the biosynthesis of capsidiol is regulated, in part, by the activity of the first of the two hydroxylases which catalyse its formation from this hydrocarbon and furthermore, that this 3-hydroxylase is induced during the elicitation process.

TL;DR: The results suggest that one of the regulatory principles of shikonin biosynthesis in these cultures is the ratio of the activities of p -hydroxybenzoic acid geranyltransferase and p -Hydroxybenzosic acid glucosyltransferase.

TL;DR: In this article, a new ionone derivative glucoside, icariside B8, two new lignan glycosides and four new phenylethanoid glucosides were identified from the aerial parts of Epimedium diphyllum.

TL;DR: A resistant biopolymer, PRB L, occurs in the outer walls of the L race of Botryococcus braunii and does not belong to the same family as PRB A and B, the structures of which are based on long, normal hydrocarbon chains.