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Article
Pyrenes and pyrendiones from Uvaria lucida
A chemical investigation of the chloroform extract of the roots of Uvaria ludida Benth. (Annonaceae), an important African traditional medicine, led to the isolation of six new compounds; three pyrenes, 2-hydroxy...
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Article
Chemical studies on the roots of Uvaria welwitschii
A chemical investigation of the chloroform extract of the roots of Uvaria welwitschii (Annonaceae), an African traditional medicine taken for stomach ache, led to the isolation of eight new compounds, named welwi...
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Article
Hydroxyespintanol and schefflerichalcone: two new compounds from Uvaria scheffleri
A chemical investigation of the petroleum ether extract and chloroform extract of the root of Uvaria scheffleri Diels (Annonaceae) led to the isolation of two new compounds, named hydroxyespintanol (1) and scheff...
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Article
Antinociceptive effects of the extracts of Xylopia parviflora bark and its alkaloidal components in experimental animals
In the present study, we attempted to elucidate the antinociceptive activity of Xylopia parviflora bark using the acetic acid-induced writhing test, hot plate test, and formalin test in mice. The MeOH extract (10...
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Article
A new acyclic diterpene acid and bioactive compounds from Knema glauca
Investigation of the chemical constituents of the fruits of Knema glauca (Myristicaceae) yielded a new acyclic diterpene acid, named glaucaic acid 4, together with four acylphenols, including 1-(2,6-dihydroxyphen...
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Article
New isoflavones from Belamcandae Rhizoma
Four new isoflavones (iristectrigenin A-7-glucoside (2), 8-hydroxytectrigenin (5), 8-hydroxyiristectrigenin A (6), and 8-hydroxyirigenin (7–1) have been isolated from Belamcandae Rhizoma (the rhizome of Belamcand...
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Article
Tropane alkaloids from Erythroxylum emarginatum
A tropane alkaloid, anhydroecgonine methyl ester N-oxide (2), was isolated for the first time as a naturally occurring compound, with anhydroecgonine methyl ester (1) from the bark of Erythroxylum emarginatum. Co...
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Article
Cytotoxic C-benzylated chalcone and other constituents ofEllipeiopsis cherrevensis
A new natural C-benzylated chalcone, 2′,4′-dihydroxy-3′-(2-hydroxybenzyl)-6¢-methoxychalcone (2), along with two other flavonoids, tiliroside and kaempferol 3-O-rutinoside, and an oxoaporphine alkaloid, lanuginos...
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Article
High Performance Liquid Chromatographic Behavior of Difluoroborane Derivatives of β-Diketones
β-Diketones react with boron trifluoride (BF3) under mild reaction conditions to give their difluoroborane (BF2) chelates quantitatively. The complexes gave sharp peaks on both normal- and reversed-phase high per...
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Article
Quantitative analysis of phenethylamine derivatives by thin layer chromatography. Determination of psychotropic drugs and ephedra bases
The reactions between phenethylamine derivatives and sodiumβ-naphthoquinone-4-sulfonate were investigated. In weakly alkaline condition, amphetamine, methamphetamine, 2,5-dimethoxy-4-methylamphetamine and mescali...
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Article
Capacitance-conductance detector for high-pressure liquid chromatography. Application to alkaloids and fatty acids
A new type of detector for high-pressure liquid chromatography has been designed. This detector is equipped with a RC resonance circuit, and is similar to the capacitance detector previously reported. It is op...
