title: Investigation of double stranded DNA damage induced by quercetin-copper(II) using piezoelectric quartz crystal impedance technique and potentiometric stripping analysis.
abstract: DNA damage by quercetin-Cu(2+) was monitored in real time by piezoelectric quartz crystal impedance (PQCI) technique. In the PQCI analysis, the frequency change was caused mainly by the changes in density-viscosity of DNA solution in the damage course. The influences of DNA, Cu(2+), and quercetin concentrations on the motional resistance change (DeltaR(m)) were investigated in detail. The results showed that quercetin exhibited pro-oxidative damage at lower concentrations while anti-oxidative protection at higher concentrations, and DeltaR(m) exhibited a linear relationship in the DNA concentration range from 200 to 1600 microg/ml. Potentiometric stripping analysis (PSA) was also used to observe the electrochemical behavior of damaged DNA. From PSA, a new peak at 0.84 V and a higher peak at 1.06 V were discovered, which suggested that more purines were exposed to the electrode surface during the damage course. In agarose-gel electrophoresis, catalase and biquinoline were found to effectively inhibit DNA damage, therefore, a possible damage mechanism was proposed.
authors.affiliation: State Key Laboratory of Chemometrics and Chemo/Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
authors.forename: Yingju
authors.initials: Y
authors.lastname: Liu
authors.forename: Keqin
authors.initials: K
authors.lastname: Deng
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.forename: Shanchao
authors.initials: S
authors.lastname: Liu
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
mesh_terms: D002374:Catalase / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology*; D004247:DNA / Q000187:drug effects* / Q000378:metabolism; D004249:DNA Damage / Q000187:drug effects*; D017097:Electric Impedance; D004587:Electrophoresis, Agar Gel; D011199:Potentiometry; D011791:Quartz; D011794:Quercetin / Q000494:pharmacology*; D011804:Quinolines / Q000494:pharmacology
chemical_list: D011804:Quinolines; D011791:Quartz; D003300:Copper; D004247:DNA; D011794:Quercetin; D002374:Catalase