期刊
ANALYTICAL BIOCHEMISTRY
卷 405, 期 2, 页码 255-259出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ab.2010.06.006
关键词
Cyanine dye; SOD; Superoxide; Enzymatic assay
资金
- Ministere de la Recherche (France)
With the aim of developing a novel superoxide dismutase (SOD) activity assay, a series of polymethinium salts (streptocyanines) were prepared and studied for their ability to be reduced by superoxide radical anion generated either from the pyrogallol autoxidation or by the xanthine oxidase-catalyzed oxidation of xanthine. The nonacarbon chain streptocyanine 9Cl(NEt2)(2) was found to be relatively stable in neutral buffered aqueous solutions, to be reduced at a significant rate by superoxide, and addition of iron-dependent superoxide dismutase (Fe-SOD) prevented its bleaching, thus constituting a good candidate as a possible superoxide indicator in a spectrophotometric SOD assay. The values found to be optimal for a SOD assay were defined as pH 7.4, wavelength 728 nm, xanthine and xanthine oxidase as superoxide source, and a reaction time of 5 min. Based on the color change caused by the superoxide-induced bleaching of the streptocyanine, a qualitative colorimetric method for the SOD activity detection is proposed, enabling visual detection within a short time without any instrument. (C) 2010 Elsevier Inc. All rights reserved.
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