Effect of membrane filtration of antimalarial drug solutions on in vitro activity against Plasmodium falciparum.
Antimalarial activities of chloroquine, mefloquine, amodiaquine, and quinine in vitro against Plasmodium falciparum were diminished as a consequence of membrane filtration. Filtered drug solutions gave ID(50) values up to 25-fold greater than those of non-filtered (ethanol-sterilized) drug solutions. Loss of activity by filtration was overcome by increasing the drug concentration prior to filtration. Water solutions filtered through Millex-GS filter units consistently showed an absorbance max...Expand abstract
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