title: Electrochemical biosensor for the detection of H2O2 from living cancer cells based on ZnO nanosheets.
abstract: In this work, direct electron transfer of cytochrome c (cyt. c)--a model for studying the electron transfer of enzymes is achieved at hexagonal ZnO nanosheets by one-step electrodeposition. UV-vis spectra and electrochemical data demonstrate that such ZnO nanosheets can supply a bio-compatible surface to keep the bioactivity of cyt. c. The redox formal potential (E(0)') of cyt. c is estimated to be 338.2+/-4.3 mV (vs. AgAgCl) at the nanostructured ZnO surface. This value is much more positive than those of enzymes previously obtained at other metal oxides and zeolite surfaces. Experiment data show, under the optimized potential of 0.0 V (vs. AgAgCl), the electrochemical determination of H(2)O(2) is free from not only anodic interferences like ascorbic acid (AA) and dopamine (DA), but also a cathodic interference-O(2). Such an excellent selectivity enable the present H(2)O(2) biosensor determine the extracellular H(2)O(2) released from living human hepatoma cells.
authors.affiliation: Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Rui
authors.forename: Kikuo
authors.initials: K
authors.lastname: Komori
authors.forename: Yang
authors.initials: Y
authors.lastname: Tian
authors.forename: Haiqing
authors.initials: H
authors.lastname: Liu
authors.forename: Yongping
authors.initials: Y
authors.lastname: Luo
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Sakai
mesh_terms: D000327:Adsorption; D000818:Animals; D055162:Biocatalysis; D015374:Biosensing Techniques; D045744:Cell Line, Tumor; D045304:Cytochromes c / Q000737:chemistry / Q000378:metabolism*; D004563:Electrochemistry; D004579:Electron Transport; D006736:Horses; D006801:Humans; D006861:Hydrogen Peroxide / Q000032:analysis*; D008113:Liver Neoplasms / Q000378:metabolism* / Q000473:pathology; D043942:Nanotubes / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D045304:Cytochromes c; D006861:Hydrogen Peroxide; D015034:Zinc Oxide