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Despite many phytochemical and pharmacological investigations, to date, there are no reports concerning the antibabesial activity of extracts of A. millefolium against B. canis. This study was aimed at investigating the biological activities of A. millefolium against the Babesia canis parasite and to identify its chemical ingredients. The water (WE), ethanol (EE) and hexane/acetone (H/AE) extracts of plant aerial parts were screened for total phenolic content (TPC), total flavo- noid compound (TFC), DPPH free radical-scavenging activity and its antibabesial activity assay. In this study, imidocarb diproprionate was used as a positive control. The H/AE and EE extracts were analysed using gas chromatography–mass spectroscopy (GC–MS). In the EE extract, the main compounds were 17.64% methyl octadec-9-ynoate, 16.68% stigmast-5-en-3-ol(3α,24S) and 15.17% hexadecanoic acid. In the H/AE extract, the main com- pounds were 34.55% 11-decyldocosane, 14.31% N-tetratetracontane, 8.22% β-caryophyllene, and 7.69% N-nonacosane. Extract of EE contained the highest content of phenolics followed by H/AE and WE. The concentration of flavonoids in EE, H/AE and WE extracts showed that TFC was higher in the EE samples followed by H/AE and WE. The antioxidant activities were highest for AA, followed by EE, WE and H/AE. The antibabesial assay showed that the WE, EE and H/AE extracts of A. millefolium were antagonistic to B. canis. At a 2 mg/mL concentration, it showed 58.7% (± 4.7%), 62.3% (± 5.5%) and 49.3% (± 5.1%) inhibitory rate in an antibabesial assay, respectively. Considering these results, the present findings suggest that A. millefolium extracts may be a potential therapeutic agent and that additional studies including in vivo experiments are essential.
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