Novel quantitative structure activity relationship models for predicting hexadecane/air partition coefficients of organic compounds.

Predicting the logarithm of hexadecane/air partition coefficient (L) for organic compounds is crucial for understanding the environmental behavior and fate of organic compounds and developing prediction models with polyparameter linear free energy relationships. Herein, two quantitative structure activity relationship (QSAR) models were developed with 1272 L values for the organic compounds by using multiple linear regression (MLR) and support vector machine (SVM) algorithms. On the basis of the OECD principles, the goodness of fit, robustness and predictive ability for the developed models were evaluated. The SVM model was first developed, and the predictive capability for the SVM model is slightly better than that for the MLR model. The applicability domain (AD) of these two models has been extended to include more kinds of emerging pollutants, i.e., oraganosilicon compounds. The developed QSAR models can be used for predicting L values of various organic compounds. The van der Waals interactions between the organic compound and the hexadecane have a significant effect on the L value of the compound. These in silico models developed in current study can provide an alternative to experimental method for high-throughput obtaining L values of organic compounds. Ø Six molecular descriptors were utilized for establishing MLR and SVM models. Ø For predictive ability, the SVM model performs slightly better than the MLR one. Ø The ADs for MLR and SVM models cover more kinds of organosilicon compounds. Ø The van der Waals interactions can influence the L value significantly. [Display omitted] [ABSTRACT FROM AUTHOR]