title: Assay and analysis for anti- and pro-oxidative effects of ascorbic acid on DNA with the bulk acoustic wave impedance technique.
abstract: A bulk acoustic wave (BAW) impedance sensor has been applied for in situ monitoring of the whole process of DNA oxidative damage induced by the vitamin C (Vc)-Fe (III) system, based on its real-time responses to the density-viscosity change of the tested solution due to the damages occurring on the DNA molecules. The results showed that Vc exhibited two conflicting effects, i.e., pro-oxidation and anti-oxidation on the DNA at different Vc concentrations in the damage system, and the "threshold" concentration of Vc for these two effects was estimated to be about 100 micromol/L. The end-point frequency change of the sensor (Deltaf(m)) was found to be linearly related to the initial concentration of the soybean DNA (C(DNA)) in the range of 40-1000 microg/mL, and the exponential relationship between the frequency change (Deltaf(0)) vs damaging time suggested that the Fe (III)-mediated DNA damage by Vc could be described as a first-order kinetics reaction. The effects of variations in concentrations of Vc and Fe3+ on the DNA oxidative damage were discussed, and based on investigations for the enhancing influence of H2O2 and inhibiting influence of HO* scavengers on the DNA damage, the nature and physiological toxicity of the damage in biological system were also examined. In addition, UV-vis spectra and electrophoresis analysis were also used, and the experimental observations were in good agreement with the above results.
authors.affiliation: Chemical Research Institute, Hunan Normal University, Changsha, 410081, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Guo
authors.forename: Yu
authors.initials: Y
authors.lastname: Yuan
authors.forename: Yaohui
authors.initials: Y
authors.lastname: Wu
authors.forename: Qingji
authors.initials: Q
authors.lastname: Xie
authors.forename: Shouzhuo
authors.initials: S
authors.lastname: Yao
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry* / Q000378:metabolism; D001681:Biological Assay; D004249:DNA Damage; D018744:DNA, Plant / Q000737:chemistry*; D004492:Edetic Acid / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D007501:Iron / Q000378:metabolism; D010084:Oxidation-Reduction; D017382:Reactive Oxygen Species / Q000378:metabolism; D013025:Glycine max; D013056:Spectrophotometry, Ultraviolet
chemical_list: D018744:DNA, Plant; D017382:Reactive Oxygen Species; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D007501:Iron; D001205:Ascorbic Acid