Abstract
We present a more accurate method for the quantification of superoxide anion (O2·−) and hydrogen peroxide (H2O2) simultaneously in human HepG2 cell extracts. After the xanthine/xanthine oxidase system was added into cell extract which was devoid of O2·− and H2O2, steady-state and in-situ produced O2·− and H2O2 by xanthine/xanthine oxidase system was labeled by fluorescent probes and subsequently separated by microchip electrophoresis. Based on this method, two differential equations with the calibration coefficients were established for O2·− and H2O2, respectively. Using the established dual-calibration coefficients, we obtained the calibrated concentrations of O2·− and H2O2 that produced in human HepG2 cells, which were lower (0.66±0.03 and 0.82±0.04 µmol/L for O2·− and H2O2, respectively) than that (0.85±0.03 and 0.96±0.03 µmol/L for O2·− and H2O2, respectively) obtained from statutory working curve. The proposed dual-calibration coefficient protocol takes into account both the complex matrix effect of the biological system and real time decaying of O2·− and H2O2, providing a method with higher accuracy.
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Li, H., Li, L., Wang, X. et al. Dual-calibration coefficient: a more accurate protocol for simultaneous determination of superoxide and hydrogen peroxide in human HepG2 cell extracts. Sci. China Chem. 58, 825–829 (2015). https://doi.org/10.1007/s11426-015-5396-8
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DOI: https://doi.org/10.1007/s11426-015-5396-8