Abstract
The relative skin-sensitizing potency of 3 biocides, 5-chloro-2-methyl-4-isothiazolin-3-one (the major active ingredient in Kathon CG), 1,2-benzisothiazolin-3-one and 2-methyl-4,5-trimethylene-4-isothiazolin-3-one, was assessed using the murine local lymph node assay. Potency was ranked according to the lowest dose of material which, following epicutaneous exposure, induced a significant proliferation of T lymphocytes in the draining lymph nodes. The results showed that 5-chloro-2-methyl-4-isothiazolin-3-one was able to induce proliferative activity at significantly lower dose levels than the other 2 biocides and that it may therefore be a more potent skin sensitizer.
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