Browsing by Author "I Ezzat, Marwa"

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    In vitro evaluation of cytotoxic activity of the ethanol extract and isolated compounds from the corms of Liatris spicata (L.) willd on HepG2
    (Taylor & Francis, 2017) I Ezzat, Marwa; Ezzat, Shahira M; S El Deeb, Kadriya; M El Fishawy, Ahlam
    Investigation of the ethanol extract of the corms of Liatris spicata (L.) willd led to the isolation of two sterols: stigmasterol and its 3-O-glucoside, a triterpene: obtusifoliyl acetate, two benzofurans: euparin and 6-hydroxy-3-methoxytremetone, three phenolic acids: protocatechuic, vanillic and ferulic acid and a sesquiterpene lactone igalan. The structures of the isolated compounds were established on the basis of physicochemical properties and spectral analysis (IR, EI/MS, 1H NMR and 13C NMR). The ethanol extract and its isolated compounds evidenced cytotoxic activities against human liver cancer cell line (HepG2), where igalan showed the highest potency (3.83 ± 0.043) μg/mL, its effect was comparable to that of the standard drug doxorubicin® (3.73 ± 0.036) μg/mL.
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    A new acylated flavonol from the aerial parts of Asteriscus maritimus (L.) Less (Asteraceae)
    (Taylor & Francis, 2016) I Ezzat, Marwa; Ezzat, Shahira M; S El Deeb, Kadriya; M El Fishawy, Ahlam; A El-Toumy, Sayed
    Phytochemical investigation of the flowering aerial parts of Asteriscus maritimus (L.) Less (Asteraceae) led to the isolation of a new compound: patuletin 7-O-β-D-[(2″′S) 6″(3″′-hydroxy-2″′-methyl-propanoyl)] glucopyranoside, together with five known metabolites; β-sitosterol 2, chlorogenic acid 3, P-hydroxy -methylbenzoate 4, luteolin 5 and protocatechuic acid 6. The structures of the isolated compounds were determined by comprehensive analyses of its 1D and 2D NMR, HRMS and compared with previously known analogues. The ethanolic extract of the flowering aerial parts of A. maritimus was found to be safe (LD50 = 4.6 mg/kg) and possess significant antioxidant and anti-inflammatory activities and this was in accordance with its high phenolic content (107.36 ± 0.051 mg GAE/g extract).