Antioxidant activity and interaction with DNA and albumins of zinc–tolfenamato complexes. Crystal structure of [Zn(tolfenamato)2(2,2′-dipyridylketoneoxime)2]
摘要:
The zinc(II) complex of the non-steroidal anti-inflammatory drug tolfenamic acid (=Htolf) in the presence of 2,2 '-dipyridylketone oxime (=Hpko) as a N,N'-donor heterocyclic ligand, [Zn(tolf-O)(2)(Hpko-N,N')(2)]center dot MeOH (=1 center dot MeOH), has been synthesized and characterized by physicochemical techniques including X-ray crystallography. The complex exhibits good binding affinity to human or bovine serum albumin with high binding constant values. Complex 1 and previously reported Zn-tolfenamato complexes were tested for their free radical scavenging activity and in vitro inhibitory activity against soybean lipoxygenase and exhibited significant activity with [Zn(tolf)(2)(1,10-phenantroline)] being the most active compound. The complexes interact with calf-thymus (CT) DNA via intercalation, and can displace the DNA-bound ethidium bromide with 1 exhibiting the highest binding constant to CT DNA. (C) 2013 Elsevier Masson SAS. All rights reserved.