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... Les polyphénols du bois de chêne, extractibles et composés liés à la paroi végétale = lignines, lignanes, tanins et aldéhydes phénoliques, ont été envisagés au niveau moléculaire de leurs relations avec les propriétés physico-chimiques des bois : retrait, porosité, propriétés mécaniques. Des résultats originaux ont été aussi présentés concernant le fractionnement des polyphénols pariétaux, l'incru ...
... The chemical constituents and economic plants of the Euphorbiaceae. A chemical review of the different classes of compounds which have been isolated from the Euphorbiaceae (other than the diterpenoids) is given. This includes triterpenoids and related compounds (sterols, alcohols and hydrocarbons), phenolic compounds (flavonoids, lignans, coumarins, tannins, phenanthrenes, quinones, phenolic acids ...
... Cell suspensions of Linum flavum L. contained large amounts (2 g.l-1) of the glucoside coniferin which was accumulated endogenously up to 12.4% on a dry-weight basis. Callus material contained 5.6%, while in leaves of in-vitro-grown plantlets, the origin of the callus and suspension cultures, no coniferin could be detected. Leaf, callus and suspension material were compared for metabolite accumula ...
... Rhatany, the name given to several species of Krameria, figured prominently in European and Euro-American medicine between 1820 and 1920. Uses for rhatany were numerous but generally centered around the astringent properties of the tanniniferous root extracts. Evidence suggests that the adoption ofKrameria as a medicinal plant resulted from the advocacy of its use by Hipólito Ruiz following his re ...
... Sunlight provides the energy required for all biochemical, physiological and developmental processes necessary for plant growth, reproduction and survival. The role of light in photosynthesis and photomorphogenesis has been appreciated for some time; however, the role of light in plant defence is a comparatively recent realization. Between 75–100 photosensitizers or phototoxins, molecules that bec ...
... The erythro 8-O-4' neolignan IIIb was synthesized and was found to have identical (1)H and (13)C NMR characteristics to a neolignan reported as a component of the roots of Nardostachys jatamansi. The NMR spectral characteristics of compound IIIb were also identical with those of a neolignan previously obtained from the roots of Piper capense, for which the unlikely 8-O-3' structure IVa had been pr ...
Silybum marianum; lignans; irrigation; soil water regimes; nitrogen; nutrient availability; chemical constituents of plants; high performance liquid chromatography
... Three new lignans were obtained from the roots of Bupleurum salicifolium (Umbelliferae). Two proved to be butenolides, methylchasnarolide [1] and chasnarolide [3], and the other, a gamma-butyrolactone, was benchequiol [6]. Their structures were determined by spectral and chemical means. ...
... Two new coumarins, prilostin [1] and ptilostol [2], were isolated from the aerial parts of Haplophylium ptilostylum (Ruraceae) together with two known lignans, justicin B and isodaurinol. The structures of the new and the known compounds were established by spectral data. ...
Bupleurum; Globodera rostochiensis; leaves; lignans; nematicidal properties; nematode control; chemical constituents of plants; pesticidal plants
Abstract:
... A series of lignans from Bupleurum salicifolium Soland (Umbelliferae) were tested for nematostatic activity on the cysts and freed second-stage juveniles of the potato cyst nematodes Globodera rostochiensis and G. pallida. None of the six lignans tested-bursehernin, matairesinol, syringaresinol, the novel product buplerol, guayarol, and a derivative, nortrachelogenin triacetate-showed nematicidal ...
... Plant enzymes are able to catalyze regio- and stereospecific reactions. Freely suspended and immobilized plant cells as well as enzyme preparations can therefore be applied for the production of pharmaceuticals by bioconversion, as such or in combination with chemical syntheses. This review paper deals with bioconversions of added precursors from natural or synthetic origin by several biocatalytic ...
... Insecticidal and growth-reducing properties of extracts of 14 species of American neotropical Piperaceae were investigated by inclusion in diets of a polyphagous lepidopteran, the European corn borer, Ostrinia nubilalis. Nutritional indices suggested most extracts acted by postdigestive toxicity. Piper aduncum, P. tuberculatum, and P. decurrens were among the most active species and were subjected ...