A library of 33 polymethoxylated flavones (PMF) was evaluated for heme-binding affinity by biomimetic MS assay and in vitro antiplasmodial activity on two strains of P. falciparum. Stability of heme adducts was discussed using the dissociation voltage at 50% (DV₅₀). No correlation was observed between the methoxylation pattern and the antiparasitic activity, either for the 3D7 chloroquine-sensitive or for the W2 chloroquine-resistant P. falciparum strains. However, in each PMF family an increased DV₅₀ was observed for the derivatives methoxylated in position 5. Measurement of intra-erythrocytic hemozoin formation of selected derivatives was performed and hemozoin concentration was inversely correlated with heme-binding affinity. Kaempferol showed no influence on hemozoin formation, reinforcing the hypothesis that this compound may exert in vitro antiplasmodial activity mostly through other pathways. Pentamethoxyquercetin has simultaneously demonstrated a significant biological activity and a strong interaction with heme, suggesting that inhibition of hemozoin formation is totally or partially responsible for its antiparasitic effect.

通过仿生MS测定法评估了33个聚甲氧基黄酮（PMF）库的血红素结合亲和力以及对两株恶性疟原虫的体外抗血浆活性。使用50％的解离电压（DV ₅₀）讨论了血红素加合物的稳定性。对于3D7氯喹敏感或耐W2氯喹的恶性疟原虫菌株，甲氧基化模式与抗寄生虫活性之间均未发现相关性。但是，在每个PMF家庭中，DV增加了₅₀观察到在位置5处被甲氧基化的衍生物。测量了选定衍生物的红细胞内血红蛋白形成，并且血红蛋白浓度与血红素结合亲和力成反比。山emp酚对血红蛋白的形成没有影响，强化了该化合物可能主要通过其他途径发挥体外抗血浆活性的假说。五甲氧基槲皮素同时已显示出显着的生物学活性和与血红素的强相互作用，表明抑制血zo素的形成完全或部分负责其抗寄生虫作用。