New quassinoids from indonesian Picrasma javanica. Structures of javanicins E, F, G and M.
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چکیده
منابع مشابه
Isolation and in vitro antimalarial activity of chloroform extract from Thai Picrasma javanica Bl stembark
The in vitro antimalarial activity against Plasmodium falciparum K1 of the four extracts from the stembark of Picrasma javanica Bl, that is, water, methanol, chloroform and hexane were studied using a modification of the [ 3 H]hypoxanthine incorporation method. It was found the chloroform extract showed in vitro antimalarial activity with IC50 of 20.0 g/ml. The extract was further isolated usi...
متن کاملChem. Pharm. Bull. 51(4) 385—389 (2003)
various biological activities, such as antitumor, antimalarial, antifeedant, insecticidal, antiinflammatory, amoebicidal, and herbicidal effects. We are interested in such biologically active compounds and have isolated many quassinoids from plants, such as Brucea antidysenterica, Picrasma ailanthoides, and Brucea javanica. As part of these studies, we investigated the isolation of quassinoids ...
متن کاملIsolation and in vitro antimalarial activity of hexane extract from Thai Picrasma javanica B1 stembark.
The in vitro antimalarial activities against Plasmodium falciparum K1 of four extracts from the stembark of Picrasma javanica B1; ie water, methanol, chloroform and hexane extracts were studied using a modification of the [3H]hypoxanthine incorporation method. It was found that the hexane extract showed in vitro antimalarial activity with IC50 of 3.3 microg/ml. The extract was further fractiona...
متن کاملF P M G
In group theory, it is a fundamental question to determine what information about a group is necessary and sufficient tomake a group finitely presented. In this paper, we develop the theory of Σ-invariants due to Robert Bieri and Ralph Strebel [Bieri] whi provides an answer to this question for the class of metabelian groups. We begin our study of Σ-invariants with a digression on group extens...
متن کاملAbsolute structures of new megastigmane glycosides, foliasalaciosides E(1), E(2), E(3), F, G, H, and I from the leaves of Salacia chinensis.
Following the investigation of foliasalaciosides A(1), A(2), B(1), B(2), C, and D, seven new megastigmane glycosides named foliasalaciosides E(1)-I (1-7), together with four known constituents, were isolated from the leaves of Salacia chinensis LINN. collected in Thailand. The absolute stereostructures of the new compounds were characterized on the basis of chemical and physicochemical evidence...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1990
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.38.2746