The relation between Ames test data and electronic structure for a series of benzidine derivatives investigated by...

Area of Science:

• Computational chemistry
• Toxicology
• Structure-activity relationships

Background:

• Benzidine derivatives are known mutagens, necessitating methods to predict their activity.
• Understanding the relationship between chemical structure and mutagenic potential is crucial for safety assessments.

Purpose of the Study:

• To investigate the correlation between electronic structure parameters and mutagenicity of benzidine derivatives.
• To evaluate the utility of cluster analysis combined with electronic structure calculations for predicting mutagenic activity.

Main Methods:

• Dose-response curves from Ames tests were analyzed.
• Electronic structures were calculated using the CNDO/2 method.
• Cluster analysis was applied to electronic parameters like total electron density and Highest Occupied Molecular Orbital (HOMO) energy.

Main Results:

• Total electron density on nitrogen atoms showed a classification pattern similar to known mutagenic compounds.
• Electronic structure parameters, particularly those related to nitrogen atoms, are significant predictors of mutagenicity.
• Cluster analysis effectively grouped compounds based on their electronic properties and mutagenic potential.

Conclusions:

• Nitrogen atoms in benzidine derivatives play a critical role in their metabolic activation and mutagenicity.
• Electronic structure analysis via cluster analysis is a valuable tool for the initial screening of mutagenic and carcinogenic compounds.
• This approach can help identify potentially hazardous benzidine analogs early in the research and development process.