title: Layer-by-layer assembly of graphene, Au and poly(toluidine blue O) films sensor for evaluation of oxidative stress of tumor cells elicited by hydrogen peroxide.
abstract: High level of oxidative stress is involved in formation of incipient tumor and carcinomatous cells. Here in this contribution we have explored a facile strategy to assess the oxidative stress elicited by hydrogen peroxide (H(2)O(2)) in cells with amperometric current-time technique in vitro. An electrochemical biosensor exhibiting high sensitivity and selectivity to H(2)O(2) is fabricated by integration of graphene with gold nanoparticles and poly(toluidine blue O) films. The efflux of H(2)O(2) from several representative tumor cells and normal cells on exposure to ascorbic acid could be detected by using the graphene-based nanocomposite films. The results indicate that tumor cells release much more H(2)O(2) than do the normal cells. The novel sensor raises the possibility for clinical diagnostic application to evaluate the higher level of intracellular oxidative stress of tumor cells in comparison with normal cells.
authors.affiliation: State Key Laboratory of Bioelectronics (Chien-Shiung Wu Laboratory), Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: Hucheng
authors.initials: H
authors.lastname: Chang
authors.forename: Xuemei
authors.initials: X
authors.lastname: Wang
authors.forename: Kowk-Keung
authors.initials: KK
authors.lastname: Shiu
authors.forename: Yanliang
authors.initials: Y
authors.lastname: Zhu
authors.forename: Jianling
authors.initials: J
authors.lastname: Wang
authors.forename: Qiwei
authors.initials: Q
authors.lastname: Li
authors.forename: Baoan
authors.initials: B
authors.lastname: Chen
authors.forename: Hui
authors.initials: H
authors.lastname: Jiang
mesh_terms: D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry; D006801:Humans; D020014:K562 Cells; D053768:Metal Nanoparticles / Q000737:chemistry*; D009374:Neoplasms, Experimental / Q000378:metabolism*; D018384:Oxidative Stress; D010100:Oxygen / Q000378:metabolism*; D014048:Tolonium Chloride / Q000737:chemistry*; D014867:Water / Q000032:analysis / Q000378:metabolism*
chemical_list: D014867:Water; D014048:Tolonium Chloride; D006046:Gold; D006108:Graphite; D010100:Oxygen