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Phytochemical investigation and biological activities of Echium arenarium (Guss) extracts.
Microbial Pathogenesis 2018 May
The present work was developed to evaluate the in vitro antioxidant, antibacterial, antileishmanial and cytotoxic activities of Echium arenarium (Guss) extracts, and to analyze their phytochemical composition. The highest content of total phenolic compounds was obtained in the ethyl acetate extract which showed the best DPPH scavenging activity and β-carotene bleaching inhibition (IC50 = 1.1 and 9.94 μg/mL respectively). It also exhibited the highest antibacterial activity against Gram-positive bacteria (L. monocytogenes; S. aureus; MRSA, E. faecalis and B. cereus) and antileishmanial activity against L. major (IC50 = 13.91 ± 0.43 μg/mL) and L. infantum (IC50 = 9.91 ± 0.15 μg/mL). Moreover, the active extract exhibited potent antiamastigote activity (IC50 = 22.48 ± 0.14 μg/mL and 18.59 ± 0.09 μg/mL against L. major and L. infantum respectively). Cytotoxicity studies revealed low toxicity against Raw 264.7 macrophage cell line (IC50 = 145.80 ± 0.84 μg/mL, SI < 10). Luteolin-7-O-glucoside was identified as the major flavonoid component by RP-HPLC analysis. In conclusion, Echium arenarium (Guss) extract was characterized by a wide range of biological activities and could be used as a potential natural anti-infectious drug.
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