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Ketone EC50 values in the Microtox test

H F Chen1, S S Hee

  • 1Department of Environmental Health Sciences, UCLA Center for Occupational and Environmental Health, University of California, Los Angeles School of Public Health 90024-1772, USA.

Ecotoxicology and Environmental Safety
|March 1, 1995
PubMed
Summary
This summary is machine-generated.

This study reports Microtox EC50 values for various ketones, finding that molecular weight, water solubility, and molecular geometry significantly influence toxicity. Ketone toxicity decreases with increasing molecular weight and depends on carbonyl group proximity.

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Area of Science:

  • Environmental Toxicology
  • Organic Chemistry
  • Ecotoxicology

Background:

  • Ketones are common industrial chemicals with potential environmental impact.
  • Understanding structure-activity relationships is crucial for predicting chemical toxicity.
  • Limited ecotoxicity data exists for many substituted and cyclic ketones.

Purpose of the Study:

  • To determine the ecotoxicity of a wide range of ketones using the Microtox assay.
  • To investigate the relationship between ketone chemical structure and toxicity.
  • To establish quantitative structure-activity relationships for ketone toxicity.

Main Methods:

  • Microtox assay (Vibrio fischeri bioluminescence inhibition) was used to determine EC50 values.
  • A diverse set of ketones were tested, including straight-chain, branched, cyclic, and diketones.
  • EC50 values were correlated with molecular weight (MW), water solubility, and octanol/water partition coefficient (Kow).

Main Results:

  • EC50 values were determined for numerous ketones, many reported for the first time.
  • Linear relationships between log EC50 and MW were observed for straight-chain methyl ketones and alpha-carbon substituted methyl ketones.
  • Ketone toxicity (EC50) decreased with increasing MW and increased with decreasing distance between carbonyl groups.

Conclusions:

  • Molecular weight, water solubility, and octanol/water coefficient are important determinants of ketone toxicity.
  • The spatial arrangement of functional groups, particularly carbonyl groups, significantly impacts ecotoxicity.
  • Structure-based toxicity prediction models for ketones require consideration of molecular geometry beyond simple physicochemical properties.