Fischer DCH, de Amorim Gualda NC, Bachiega D, Carvalho CS, Lupo FN, Bonotto SV, Alves MDO, Yogi A, Santi SMD, Avila PE, Kirchgatter K, Moreno PRH. In vitro screening for antiplasmodial activity of isoquinoline alkaloids from Brazilian plant species.
Acta Trop 2004;
92:261-6. [PMID:
15533296 DOI:
10.1016/j.actatropica.2004.08.009]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2003] [Revised: 07/12/2004] [Accepted: 08/17/2004] [Indexed: 11/19/2022]
Abstract
In the search for new antimalarial agents, nine Brazilian plant species were selected, from the Annonaceae (6), Menispermaceae (2) and Siparunaceae (1) families naturally occurring at the cerrado and Atlantic rainforest regions, in order to investigate their in vitro antiplasmodial activity. The ethanol and the alkaloid extracts were tested against K1, chloroquine-resistant, and Palo Alto, chloroquine-sensitive, strains of Plasmodium falciparum. The majority of the alkaloid extracts were more active than the ethanol ones, with IC(50) ranging 0.3-8.2 microg/mL. The crude Guatteria australis alkaloids were the most active against K1 with an IC(50) = 0.3 microg/mL. The most promising total alkaloid fractions for further bioguided isolation are those with the IC(50) < or = 5 microg/mL: G. australis, Cissampelos ovalifolia and Duguetia lanceolata.
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