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We have found recently that two-step intrinsic hydroxyl radical (OH)-dependent chemiluminescence (CL) could be produced by carcinogenic tetrahaloquinone and HO. However, the first-step CL was too fast to clearly detect the stepwise generation of OH and CL, and to distinguish the exact dividing point between the first-step and second-step CL. Here we found that, extremely clear two-step intrinsic CL could be produced by the relative slow reaction of tetrabromohydroquinone (TBHQ) with HO, which was directly dependent on the two-step OH generation.

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Article Synopsis
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