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[Studies on anti-tumor metastatic constituents from Lindera glauca].

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OBJECTIVE To study the anti-tumor metastatic constituents from Lindera glauca. METHODS Constituent isolation and purification was carried by repeated column chromatography (silica gel, Toyopearl HW-40 and preparative HPLC). Their structures were elucidated on the basis of spectral data analysis. The

Cytotoxic Alkaloids from the Stem of Xylopia laevigata.

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Xylopia laevigata (Annonaceae), known locally as "meiú" or "pindaíba", is widely used in folk medicine in Northeastern Brazil. In the present work, we performed phytochemical analyses of the stem of X. laevigata, which led to the isolation of 19 alkaloids: (-)-roemerine, (+)-anonaine, lanuginosine,

Alkaloids from Lindera aggregata.

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Eight alkaloids, including a new compound, (+)-norboldine acetate (1), and seven known ones, (+)-norboldine (2), (+)-boldine (3), (+)-laurotetanine (4), (+)-N-methyllaurotetanine (5), (+)-reticuline (6), (-)-pronuciferine (7), and pallidine (8) were isolated from the roots of Lindera aggregata. The

Functional Characterization of 4'OMT and 7OMT Genes in BIA Biosynthesis.

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Alkaloids are diverse group of secondary metabolites generally found in plants. Opium poppy (Papaver somniferum L.), the only commercial source of morphinan alkaloids, has been used as a medicinal plant since ancient times. It produces benzylisoquinoline alkaloids (BIA) including the narcotic

Cytotoxic benzophenanthridine and benzylisoquinoline alkaloids from Argemone mexicana.

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Fractionation of the chloroform extract from the aerial part of Argemone mexicana led to the isolation of two benzophenanthridine-type alkaloids, N-demethyloxysanguinarine and pancorine; three benzylisoquinoline-type alkaloids,

Antiplasmodial and antioxidant isoquinoline alkaloids from Dehaasia longipedicellata.

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The crude extract of the bark of Dehaasia longipedicellata exhibited antiplasmodial activity against the growth of Plasmodium falciparum K1 isolate (resistant strain). Phytochemical studies of the extract led to the isolation of six alkaloids: two morphinandienones, (+)-sebiferine (1) and

Cytotoxicity and bacterial membrane destabilization induced by Annona squamosa L. extracts.

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This study aimed to further investigate the cytotoxicity against tumor cell lines and several bacterial strains of Annona squamosa and its mode of action. Methanol extracts of A. squamosa leaves (ASL) and seeds (ASS) were used. ASL showed significant antibacterial activity against S. aureus, K.

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