Articles written in Journal of Chemical Sciences

    • Antileishmanial polyphenols from Corymbia maculata

      Jasmeen Sidana Dinesh Neeradi Alka Choudhary Sushma Singh William J Foley Inder Pal Singh

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      An activity-guided fractionation was used to identify the antileishmanial compounds of Corymbia maculata. The hexane, ethyl acetate and methanol extracts were active in in vitro antileishmanial assay. Twelve polyphenols including 8-demethyl eucalyptin (1), eucalyptin (2), myrciaphenone A (3), myrciaphenone B (4), quercetin-3-𝑂-𝛽-D-xylopyranoside (5), myricetin-3-𝑂-𝛼-L-rhamnopyranoside (6), quercetin-3-𝑂-𝛽-D-galactopyranoside (7), quercetin-3-𝑂-𝛽-D-glucopyranoside (8), quercetin-3-𝑂-𝛼-L-rhamnopyranoside (9), syringic acid (10), gallic acid-3-methyl ether (11), gallic acid-4-methyl ether (12) and gallic acid (13) were isolated from the active extracts. All the tested compounds except 8-demethyleucalyptin and myrciaphenone B showed strong to moderate (6.9-24.5 𝜇M) antileishmanial activity against Leishmania donovani promastigotes. An HPLC-PDA method has been developed to detect/quantify 29 compounds in the extracts of C. maculata leaves. This validated method allows simultaneous quantitation of seven flavonoids, fourteen phloroglucinols and eight other polyphenols and can be applied for qualitative as well as quantitative determination of phytoconstituents in Eucalyptus matrices.

    • Photoactivated cytotoxicity induced by heterobimetallic Ru(II)-Pt(II) polypyridyl complexes in MCF-7 cells


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      The heterobimetallic Ru(II)-Pt(II) polypyridyl complexes [Ru(bpy)2(BPIMBp)PtCl2]2+ (3) and [Ru(phen)2(BPIMBp)PtCl2]2+ (4) with their parent complexes [Ru(bpy)2BPIMBp]2+(1) and [Ru(phen)2-BPIMBp]2+ (2) possessing bridging ligand (BPIMBp = 1,4ʹ-Bis-{(2-pyridin-2-yl)-1H-imidazol-1-yl)methyl}-1,1ʹ-biphenyl) were used for photocytotoxicity against MCF-7 cells.The parent ruthenium complexes(complexes 1-2) exhibited a negligible increase in viscosity of DNA while heterobimetallic Ru(II)-Pt(II)system exhibited a decrease in viscosity of DNA, indicating covalent interaction (through cis-PtCl2 unit). TheRu(II)-Pt(II) system co-precipitated with CT-DNA confirmed the covalent binding. In electrophoreticmobility studies, the interaction of Ru(II)-Pt(II) system with plasmid DNA led to retardation of negativesupercoiled form, followed by positive supercoiled migration in the dark that indicated the ability to formcovalent adducts with DNA similar to cisplatin. The complexes 1-4 showed enhanced photocleavage ofplasmid DNA on blue light (~450 nm) irradiation. In a cell-based study, all the complexes exhibitedphotoactivated cytotoxicity in MCF-7 cancer cells when exposed to visible light of ~450 nm as compared tolow toxicity in absence of irradiation. Additionally, the complexes containing platinum showed induction ofautophagy in GFP-LC3 expressing MCF-7 cells. Overall our study shows that the inclusion of photosensitizerRu(II) polypyridyl complexes to cis-PtCl2 moiety improves anticancer properties of complexes.

      The effect of Ru(II)-Pt(II) polypyridyl complexes as photosensitizers was studied against MCF-7 cells. The complexes are negligibly toxic to MCF-7 cells in the dark while highly cytotoxic towards MCF-7 cells on irradiation of blue light (~450 nm). Therefore, the complexes could be potential candidates for Photodynamic Therapy.

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