title: In vitro antiplasmodial evaluation of medicinal plants from Zimbabwe.
abstract: In this study the in vitro antiplasmodial activities of extracts from Cussonia spicata (Araliaceae), Artemisia afra, Vernonia colorata, V. natalensis (Asteraceae), Parinari curatellifolia (Chrysobalanaceae), Clutia hirsuta, Flueggea virosa, (Euphorbiaceae), Adenia gummifera (Passifloraceae) and Hymenodictyon floribundum, (Rubiaceae) were evaluated. The lipophilic extracts from the aerial parts of Artemisia afra and Vernonia colorata proved to be the most active against the chloroquine-sensitive strain PoW and against the chloroquine-resistant clone Dd2 of Plasmodium falciparum. Bioassay-guided fractionation of the extract of A. afra yielded seven flavonoids, from which acacetin, genkwanin and 7-methoxyacacetin showed in vitro activity; the IC(50) values ranged from 4.3 microgram/mL to 12.6 microgram/mL. In addition, several sesquiterpene lactones could be obtained from the most active fractions. Whereas eudesmaafraglaucolide proved to be inactive, the guaianolides 1-desoxy-1alpha-peroxy-rupicolin A-8-O-acetate, 1alpha,4alpha-dihydroxybishopsolicepolide and rupicolin A-8-O-acetate revealed in vitro antiplasmodial activity. Evaluation of V. colorata gained four sesquiterpenes 11beta,13-dihydrovernodalin, vernodalol, 11beta,13-dihydrovernolide and 11beta,13,17,18-tetrahydrovernolide, from which the first two constituents exhibited the strongest antiplasmodial activity (IC(50) values: 1.1-4.8 microgram/mL).
authors.affiliation: Institut für Pharmazie (Pharmazeutische Biologie), Freie Universität Berlin, Berlin, Germany.
authors.forename: Carola
authors.initials: C
authors.lastname: Kraft
authors.forename: Kristina
authors.initials: K
authors.lastname: Jenett-Siems
authors.forename: Karsten
authors.initials: K
authors.lastname: Siems
authors.forename: Jasmin
authors.initials: J
authors.lastname: Jakupovic
authors.forename: Steven
authors.initials: S
authors.lastname: Mavi
authors.forename: Ulrich
authors.initials: U
authors.lastname: Bienzle
authors.forename: Eckart
authors.initials: E
authors.lastname: Eich
mesh_terms: D000818:Animals; D000981:Antiprotozoal Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D002738:Chloroquine; D004351:Drug Resistance; D006801:Humans; D020128:Inhibitory Concentration 50; D016778:Malaria, Falciparum / Q000188:drug therapy*; D016488:Medicine, African Traditional; D021261:Parasitic Sensitivity Tests; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D018515:Plant Leaves; D018517:Plant Roots; D018547:Plant Stems; D010946:Plants, Medicinal; D010963:Plasmodium falciparum / Q000187:drug effects*; D015030:Zimbabwe
chemical_list: D000981:Antiprotozoal Agents; D010936:Plant Extracts; D002738:Chloroquine