Chemosphere p. 1445 - 1452 (1998)
Update date:2022-08-29
Topics:
Terron, Maria C.
Verhagen, Frank J.M.
Franssen, Maurice C.R.
Field, Jim A.
The dye phenol red (phenolsulphonphthalein) was chemically brominated to bromophenol blue (3',3',5',5'-tetrabromophenolsulphonphthalein) directly by hydrogen peroxide (20 mM or higher) under acidic pH (0.5-4.5) and moderate temperature (30°C). Since this bromination reaction takes place in the absence of any chemical or biological catalyst, the results represent an important warning concerning a commonly used assay for detecting or screening haloperoxidases. Bromophenol red (5',5'-dibromophenolsulphonphthalein) and another unidentified compound were observed as temporary intermediates. Incubation of the reaction mixture with KCl instead of NaBr did not yield any chlorinated products under the same conditions.
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