Mishra K, Chakraborty D, Pal A, Dey N (2010) Plasmodium falciparum: In vitro interaction of quassin and neo-quassin with artesunate, a hemisuccinate derivative of artemisinin. Exp Parasitol. 2010 Apr;124(4):421-7. doi: 10.1016/j.exppara.2009.12.007. Epub 2009 Dec 29
The most commonly used antimalarial drug assay is the SYBR Green I based parasite growth inhibition assay (MSF assay). See Methods in Malaria Research P.122 for a protocol (https://www.mr4.org/Publications/MethodsinMalariaResearch.aspx)
Reference:
Smilkstein, M., Sriwilaijaroen, N., Kelly, J.X., Wilairat, P., Riscoe, M., 2004. Simple and Inexpensive Fluorescence-Based Technique for High-Throughput Antimalarial Drug Screening. Antimicrobial Agents and Chemotherapy. 48(5), pp.1803–1806.