quinovic acid/mitragyna

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[Quinovic acid triterpenoid saponins from bark of Mitragyna rotundifolia].

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Prijava / prijava

OBJECTIVE To study the chemical constituents from the bark of Mitragyna rotundifolia. METHODS Column chromatographic techniques were applied to isolate constituents. A combination of IR, MS and NMR spectroscopy was used to identify structures of constituents. RESULTS Six compounds were isolated from

Quinovic acid glycosides from Mitragyna stipulosa--first examples of natural inhibitors of snake venom phosphodiesterase I.

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Prijava / prijava

Phytochemical investigations on the non-alkaloidal extracts of Mitragyna stipulosa bark has led to the isolation of a series of triterpenoids mainly consisting of quinovic acid ([structure: see text]) and its glycoside derivatives [structure: see text] and [structure: see text]. The other

27-Nor-triterpenoid glycosides from Mitragyna inermis.

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From the bark of Mitragyna inermis, two 27-nor-triterpenoid glycosides, named inermiside I (1) and II (2), were isolated and their structures determined based on extensive 2D-NMR and MS spectral analysis as

[Triterpenoid saponins from bark Mitragyna inermis].

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OBJECTIVE To study the constituents of Mitragyna inermis that have an anti-tumor activity on Bel-7402 of hepatic carcinoma. METHODS The compounds were isolated by column chromatography on silica gel, ODS, Sephadex LH-20 separately and their structures were elucidated by chemical and spectral

Structure-activity relationship of triterpenoids isolated from Mitragyna stipulosa on cytotoxicity.

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Chromatographic separation of the stem bark extract of Mitragyna stipulosa afforded triterpene derivatives ursolic acid (1), quinovic acid (2), quinivic acid 3-O-beta-D-glucopyranoside (3, quinovin glycoside C), quinovic acid 3-O-[(2-O-sulfo)-beta-D-quinovopyranoside] (4, zygophyloside D) and

Phytochemical characterization of the leaves of Mitragyna speciosa grown in U.S.A.

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Prijava / prijava

Mitragyna speciosa (Rubiaceae) has traditionally been used in the tropical regions of Asia, Africa and Indonesia as a substitute for opium. Indole alkaloids are the most common compounds that have been isolated. We investigated the constituents of the leaves of M. speciosa that was grown at the

A new 9-methoxyyohimbine-type indole alkaloid from Mitragyna africanus.

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Prijava / prijava

A new yohimbine-type indole alkaloid (1). was isolated from the stem bark of Mitragyna africanus (WILLD.) collected in Nigeria, along with known seven Corynanthe-type oxindole alkaloids, two secoiridoids, three lignans, and a quinovic acid derivative. Their structures were elucidated by

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