Ketone EC50 values in the Microtox test.
The Microtox EC50 values for the following ketones are reported in the following homologous series: straight chain methyl ketones (acetone, 2-butanone, 2-pentanone, 2-hepatonone, 2-octanone, 2-decanone, and 2-tridecanone); methyl ketones substituted at one alpha carbon (3-methyl-2-butanone; 3,3-dimethyl-2-butanone); methyl substituted at two alpha carbons (2,4-dimethyl-3-pentanone; 2,2,4,4-tetramethyl-3-pentanone); phenyl groups replacing methyl in acetone (acetophenone; benzophenone); methyl groups substituted at the alpha carbons of cyclohexanone; and 2,3- 2,4-, and 2,5-hexanediones, most for the first time. While there were linear relationships between log EC50 and MW for the straight chain methyl ketones, and for methyl substitution at the alpha carbon for methyl ketones, there were no other linear relationships. As molecular weight increased, the EC50 values of soluble ketones decreased; as distance between two carbonyl groups decreased so too did EC50 values. Thus, for the ketones the geometry around the carbonyl group is an important determinant of toxicity as well as MW, water solubility, and octanol/water coefficient.
Chen
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Department of Environmental Health Sciences, UCLA Center for Occupational and Environmental Health, University of California, Los Angeles School of Public Health 90024-1772, USA.
Hee
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D007659:Ketones / Q000737:chemistry / Q000633:toxicity*; D007928:Lethal Dose 50; D008970:Molecular Weight; D010776:Photobacterium / Q000187:drug effects*; D013329:Structure-Activity Relationship; D013997:Time Factors; D018675:Toxicity Tests
D007659:Ketones