Background: Currently, malaria elimination is intimidated by the emergence of antimalarial drug and insecticide resistance. This scenario urges scientists to develop new antimalarial

drugs, where plant-based compounds are the major candidates.

Objective: The objective of this experiment was to examine the antimalarial activities of the solvent fractions of the stem bark of P. linearifolia in mice.

Methods: The dried hydromethanolic extract was treated with n-hexane, chloroform, and ethyl acetate solvents based on increasing order of polarity. For the suppressive test, after three hours

post-inoculation of P. berghei, the first group was administered the vehicle 2 mL/100 g. The second group was given chloroquine 25 mg/kg, whereas the remaining nine groups were administered 100, 200, and 400 mg/kg of each of the chloroform, ethyl acetate and aqueous fractions. Furthermore, the aqueous fraction was evaluated using Rane’s model for the curative test. The result was

statistically analyzed using a one-way analysis of variance (ANOVA). The results were considered significant at P < 0.05.

Results: In the suppressive test, the solvent fractions suppressed parasitemia level significantly (P < 0.01 for 100 mg/kg, P < 0.001 for 200 and 400 mg/kg of the aqueous and P < 0.01 for 200 mg/kg, P < 0.001 for 400 mg/kg of chloroform fractions) as compared to vehicle-treated mice, whereas in the curative model 400 mg/kg of the aqueous fraction (P < 0.01) showed

a significant parasitemia level reduction.

Conclusion: The results of this study indicated that the solvent fractions have promising antiplasmodial activity against Plasmodium berghei, which is consistent with the earlier

in vivo study of the hydromethanolic extract.

Keywords: antimalarial, Plasmodium berghei, Periploca linearifolia, solvent fractions

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