Abstract

Saponin and ammonium chloride lysis have been applied for some time to the separation of erythrocyte membranes from malarial-infected erythrocytes, allowing easy isolation of the parasites. We present a reevaluation of the use of saponin and ammonium chloride as tools for isolating Plasmodium (knowlesi or falciparum) parasites. Acetylcholine esterase (EC 3.1.1.7) was used as an erythrocyte membrane marker and CDP-choline: 1,2-diacylglycerol cholinephosphotransferase (EC 2.7.8.2) as a parasite membrane marker to monitor fractionation by these agents. Both saponin and ammonium chloride produced hemolysis of uninfected and infected erythrocytes, but failed to separate host erythrocyte membrane from the parasite, regardless of its stage. Thus, saponin and ammonium chloride can be used to isolate whole infected erythrocytes, depleted of hemoglobin, by selective disruption of uninfected cells.

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