Showing papers in "Phytochemistry in 1994"

TL;DR: In this paper, a compilation of the 13C NMR data of a selected variety of naturally occurring pentacyclic triterpenoids, arranged skeletonwise, is provided.

TL;DR: In this paper, five tannin fractions were isolated from grape (Vitis vinifera ) seeds and HPLC analysis of the degradation products released by thioacidolysis showed that all fractions consisted of catechin, epicatechin, and epicatech gallate units.

TL;DR: Current work on the characterization of antifungal metabolites in higher plants is reviewed and interesting new structures are discussed and the distributi are discussed.

TL;DR: The possible influence of plant cell wall glycoproteins on the process of lignification is discussed in the light of the observed affinity of phenolic substrates for prolyl residues in protein structures.

TL;DR: In this article, chlorogenic acid, 3,5-dicaffeoylquinic acid, caffeic acid and protocatechuic acid showed more scavenging activities on DPPH than dl -α-tocopherol or ascorbic acid.

TL;DR: The present status of plant cy tochrome P450 research is reviewed and a comparison of the properties of this group of cytochrome proteins with those of other microsomal b-type haem proteins is made.

TL;DR: 2,3-Dehydrosalvipisone, sclareol, manool, 7-oxoroyleanone, spathulenol and caryophyllene oxide were found to be active against Staphylococcus aureus, the first and third compound against Candida albicans and the last compound against Proteus mirabilis.

TL;DR: The structure of the new natural polyphenol-1,2,3- tri-O-galloyl-β-4C1-glucopyranose has been established.

TL;DR: Changes in the amounts of ascorbic acid, dehydroascorbic acid and glutathione and in the levels of related enzyme activities were studied in Sporobolus stapfianus leaves, a desiccation-tolerant or resurrection plant, in response to Desiccation and rehydration.

TL;DR: The potency and specificity of the jasmonates indicate a close relationship between JA and/or MeJA and wound-induced changes in indole glucosinolate metabolism in Brassica species.

TL;DR: The antioxidant activity of lichenic metabolites, depsides and depsidones, was assessed by their effects as inhibitors of rat brain homogenate auto-oxidation and beta-carotene oxidation and results indicate that lichensic metabolites afford a moderate protection in the microM concentration range.

TL;DR: The chiral stationary phase for UDP-glucose pyrophosphorylase has shown good chiral recognition ability and the ability to cleaveopolysaccharides and polypeptide chains is reported.

TL;DR: It is suggested that leaf hairs, besides other roles, may function as an effective filter against the harmful ultraviolet-B radiation.

TL;DR: Conjugate acid oxidation of benzyl esters with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and trifluoroacetic acid was applied to the binding site analysis of ester linkages between lignin and glucuronoxylan in Fagus crenata wood.

TL;DR: The cis-isomer of ebelin lactone was obtained as one of the artefacts of the aglycone and its structure revised, and the structure was established as 3-beta-[O-beta-D-glucopyranosyl(1-->3)-O- [alpha-L-arabinofuranosyl)oxy]jujubogenin by chemical and spectral analyses.

TL;DR: Piceid, the 3-β-glucoside of resveratrol, was observed in berries of two of the three varieties tested as mentioned in this paper, suggesting that the source and fate of this glucoside could be related to the biosynthesis of reserveratrol and its production or loss in response to plant stress.

TL;DR: A new gamma-pyrone (hyperbrasilone), three known xanthones (1,5-dihydroxyxanthones, 5-hydroxy-1-methoxyxanthone and 6-deoxyjacareubin) and betulinic acid have been isolated from a dichloromethane extract of stems and roots of Hypericum brasiliense.

TL;DR: In this paper, four new xanthones, garciniaxanthone C, 1,2,5-trihydroxy xanthone, 2,6-dihydroxy-1, 5, 6-dimethoxy Xanthone and 1, 2-dimethylhexanthone along with a new benzophenone derivative have been isolated along with their structures on the basis of mainly spectroscopic data and some chemical reactions.

TL;DR: The structures of novel sesaminol glucosides isolated from sesame seed were determined to be sesaminationol 2'-O-beta-D-glucopyranoside, sesamineol 2-O- beta- D-glUCopyransyl (1-->2)-O-[beta-d-glugopyranansyl [1-->6] -beta-C-D -D- glucop Kyranoside.

TL;DR: The processed leaves and stems of Aspalathus linearis contain hydroxylated benzoic and cinnamic acids, luteolin, chrysoeriol, quercetin, isoquercitrin, the C-C linked β- d -glucopyranosides based on four flavones and the dihydrochalcone aspalathin this paper.

TL;DR: In this paper, a reverse-phase HPLC and gel permeation chromatography was used to study the dimerization and hydrolysis of ellagitannins and gallic acid in various sapwood and heartwood samples of sessile oak and sweet chestnut.

TL;DR: The gel-diffusion assay for the quantification of endo-β- d -mannanase (EC 3.2.1.78) activity was used to quantify the enzyme activity present in seeds, fruit, bulbs and fungi; repeatability and sensitivity were excellent.

TL;DR: The polyphagous grasshopper Zonocerus variegatus sequesters intermedine and rinderine from Chromolaena flowers and transforms up to 20% of these PAs into lycopsamine and echinatine by inversion of configuration at C-3′.

TL;DR: In this paper, three new flavonoid glucuronides, luteolin 3'-O-beta-D-glucuronide, Luteolin 4'-O-(4"-O-acetyl)-β-Dglucuride, and lutesolin 3'O-(3"-O -acetyl)beta-d-gluronide together with hesperidin, were isolated from 50% aqueous MeOH extract of the leaves of rosemary.

TL;DR: Two new diterpenoids, safficinolide and sageone, which showed antiviral activity, were isolated from the aerial parts of Salvia officinalis by a detailed spectroscopic analysis.

TL;DR: This review discusses recent advances in the biochemistry and molecular biology of dioxygenases occurring in different biological systems.

TL;DR: Tissue cultures of the indigenous tree Nothapodytes foetida were established from immature embryos on Murashige and Skoog's agar medium supplemented with different auxins and cytokinins to show the presence of both camptothecin and 9-methoxycamptethecin, the major alkaloids of the parent plant.

TL;DR: Sodium periodate oxidation of caffeic acid in aqueous solutions with pH ranging from 2 to 7 was investigated in this paper, and two products obtained at pH values lower than 4.6 approximately, were analyzed and isolated by reverse phase HPLC.

TL;DR: Betacyanins from the bracts of Bougainvillea glabra were isolated and characterized by a combination of spectroscopic techniques as gomphrenin I and various derivatives of bougainvillein-v, reaching ratios of flavonol to betacyanin of 1:1.

TL;DR: The high PUFA content of most of these microalgae make them good potential raw materials for cosmetic upgrading, and the amounts of linolenic, octadecatetranoic and docosahexaenoic acids found in I. galbana were notable.