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Studies on the Antiplasmodial Properties of Some South African Medicinal Plants Used As Antimalarial Remedies in Zulu Folk Medicine

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Publisher Thomson Reuters
Specialty Pharmacology
Date 2002 Nov 14
PMID 12428427
Citations 13
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Abstract

The parasite lactate dehydrogenase (pLDH) assay method, a recently developed in vitro enzymatic method for evaluating antimalarial compounds, was used to examine the antiplasmodial activities of the aqueous leaf, stem-bark and fruit extracts of some plants used for the treatment and/or prophylaxis of malaria in KwaZulu-Natal province of South Africa. The in vitro antiplasmodial assay was carried out using a chloroquine-sensitive strain of malarial parasite, Plasmodium falciparum D10. A preliminary phytochemical analysis of the plant extracts was carried out using UV spectral analysis and thin-layer chromatography (TLC) to separate the chemical constituents of the extracts. Their chemical components were subsequently identified by treating the TLC plates with various spray reagents. Of the 14 plant extracts investigated, only 10 were found to have IC50 values of 10-50 micrograms/ml. The two most active extracts were Psidium guajava stem-bark extract and Vangueria infausta leaf extract, both of which showed IC50 values of 10-20 micrograms/ml. Phytochemical analysis of these two active plant extracts revealed the presence of anthraquinones, flavonoids, seccoirridoids and terpenoids.

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