A new method for hydroxyl radical detection by chemiluminescence of flue-cured tobacco extracts.

Spectrochim Acta A Mol Biomol Spectrosc

Laboratory of Quality & Safety Risk Assessment for Tobacco, Ministry of Agriculture, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, PR China. Electronic address:

Published: November 2018

Chemiluminescence (CL) reactions usually take place in a severely restricted pH regime, thereby confining their application in media at different pH. In this paper, the CL behavior of tobacco-methanol extract (TME) was explored. Surprisingly, TME exhibited CL behavior upon mixing with Fe/HO, HRP/HO and gold nanoparticles/HO oxidation systems, i.e., in acidic, neutral and alkaline solution respectively. Addition of different reactive oxygen species scavengers verified that the hydroxyl radical (OH) triggers TME CL reactions. Then, the CL behavior of TME was applied to determine OH in tetrachloro-1,4-benzoquinone (TCBQ)/HO system in acidic, neutral and alkaline solutions. CL intensity correlated most strongly (R = 0.99) with TCBQ concentration, which was used as a means to indirectly denote OH concentration. This implies that OH could be determined by a TME CL method in a semi-quantitative way regardless of pH value. Therefore, the TME CL method may be a promising method for OH determination in various OH-generating systems.

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http://dx.doi.org/10.1016/j.saa.2018.06.051DOI Listing

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