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Gas Chromatographic Determination of Cyprodinil, Fludioxonil, Pyrimethanil, and Tebuconazole in Grapes, Must, and Wine
(Journal of AOAC International, 1997-07-01) [Artigo]
A rapid and simple gas chromatographic method for determinating cyprodinil, fludioxonil, pyrimethanil, and tebuconazole in grapes, must, and wine is described. An on-line microextraction method was used with a one-step ...
DDT and HCH residues in the blood serum of malaria control sprayers
(Bulletin of Environmental Contamination and Toxicology, 1996-11-01) [Artigo]
8-benzylberbine and N-oxide alkaloids from Aristolochia gigantea
(Phytochemistry, 1997-05-01) [Artigo]
From the ethanol extract of Aristolochia gigantea Mart an 8-benzylberbine-type alkaloid and an N-oxide were isolated together with pinitol and sequoyitol. Structural assignments were based on analysis of spectral data, ...
Caffeic acid esters and triterpenes of Alibertia macrophylla
(Phytochemistry, 1991-12-01) [Artigo]
A hydroalcoholic extract of the leaves of Alibertia macrophylla afforded the esters of caffeic acid and 2-phenylethanol or 2-methyl butane-1,4-diol. The leaves also contain caffeic acid. The acetone extract of the stems ...
Complete Assignments of ¹H and 13C-NMR Spectra of the 3,4-seco-Triterpene Canaric Acid isolated from Rudgea jasminoides
(Journal of the Brazilian Chemical Society, 1999-01-01) [Artigo]
O ácido canárico 1 foi isolado das folhas de Rudgea jasminoides. A substância isolada é um derivado triterpênico do tipo seco-lupano e teve sua estrutura elucidada com base nos dados espectrais, principalmente em experimentos ...
Terpenes from Aristolochia triangularis
(Phytochemistry, 1990-12-01) [Artigo]
Phytochemical examination of Aristolochia triangularis led to the isolation of allantoin, nerolidol, sitosterol, dibenzylbutyrolactone type lignans and ent-kaurane type diterpenes. This is the first report on the isolation ...
8-benzylberbine alkaloids from Aristolochia gigantea
(Phytochemistry, 1992-12-01) [Artigo]
Phytochemical examination of Aristolochia gigantea led to the isolation of 10 alkaloids, belonging to the new 8-benzylberbine type. Eight of them occurred as glucosides. The structural assignments were based on analysis ...
Determination and persistence of methiocarb in artichokes
(Italian Journal of Food Science, 1996-12-01) [Artigo]
A simple and rapid method for the determination of methiocarb in artichokes by high-performance liquid chromatography with UV detection is described. No derivatization is needed and the limit of determination (0.01 ppm) ...
Separation of flavonoids and naphthopyrones from four Brazilian Paepalanthus species by droplet countercurrent chromatography
(Revista Brasileira de Plantas Medicinais, 1999-12-01) [Artigo]
A general procedure was developed for the simultaneous separation of flavonoids and naphthopyrones from the polar extracts of the capitula from Brazilian everlasting plants is described. The ethanolic extracts of several ...
Antifungal iridoids from the stems of Tocoyena formosa
(Journal of the Brazilian Chemical Society, 1996-07-01) [Artigo]
A new antifungal iridoid compound, together with three active known iridoids, galioside, galioside aglucone, and apodanthoside, as well as 3-O-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyl quinovic acid and quercetin- ...