title: Spectrophotometric analysis of flavonoid-DNA binding interactions at physiological conditions.
abstract: Mode of interactions of three flavonoids [morin (M), quercetin (Q), and rutin (R)] with chicken blood ds.DNA (ck.DNA) has been investigated spectrophotometrically at different temperatures including body temperature (310 K) and at two physiological pH values, i.e. 7.4 (human blood pH) and 4.7 (stomach pH). The binding constants, K(f), evaluated using Benesi-Hildebrand equation showed that the flavonoids bind effectively through intercalation at both pH values and body temperature. Quercetin, somehow, showed greater binding capabilities with DNA. The free energies of flavonoid-DNA complexes indicated the spontaneity of their binding. The order of binding constants of three flavonoids at both pH values were found to be K(f(Q)) > K(f(R)) > K(f(M)) and at 310 K.
authors.affiliation: Department of Chemistry, Quaid-i-Azam University, Islamabad 45230, Pakistan. nkausarjanjua@yahoo.com
authors.forename: Naveed Kausar
authors.initials: NK
authors.lastname: Janjua
authors.forename: Asima
authors.initials: A
authors.lastname: Siddiqa
authors.forename: Azra
authors.initials: A
authors.lastname: Yaqub
authors.forename: Sana
authors.initials: S
authors.lastname: Sabahat
authors.forename: Rumana
authors.initials: R
authors.lastname: Qureshi
authors.forename: Sayed
authors.initials: S
authors.lastname: ul Haque
mesh_terms: D000818:Animals; D002645:Chickens; D004247:DNA / Q000378:metabolism*; D005419:Flavonoids / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D011794:Quercetin / Q000378:metabolism; D012431:Rutin / Q000378:metabolism; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D047309:Flavones
chemical_list: D004247:DNA; D005419:Flavonoids; D011794:Quercetin; D012431:Rutin; C008548:morin; D047309:Flavones