Abstract
A quantitative structure–retention relationship (QSRR) study was performed to correlate descriptors representing molecular structures to the Kováts retention indices of polycyclic aromatic hydrocarbon compounds. The complete set of 37 compounds was divided randomly into a training set of 26 compounds and a test set of 11 compounds. In the pool of descriptors calculated using Dragon and Hyperchem software, the modified Harary index (\( H^{\prime\prime} \)) developed by our team was added. The best selected descriptors by genetic algorithm to build the three linear models were: the first-order Randić connectivity index (\( {}^{1}\chi \)), \( H^{\prime\prime} \) and the third-order valence connectivity index (\( {}^{3}\chi_{p}^{v} \)). The selected model was compared with the one built with \( {}^{1}\chi \), the first Harary index (implanted in Dragon H) and \( {}^{3}\chi_{p}^{v} \). Statistical analysis showed that the model with modified Harary index (R 2 = 99.25, SD 5.82, F = 1517.74) produces better correlation with Kováts retention indices than the one implanted in Dragon (R 2 = 98.20, SD 9.02, F = 626.09). The final QSRR was internally and externally validated. The leave-one-out, cross-validation, bootstrapping, and y-randomization test indicated that the final model is robust and has no chance correlation. The external validations indicated that the model with modified Harary index showed a good predictive power. The mechanistic interpretation of QSRR model was carried out according to the definition of descriptors. Therefore, the result meets the five principles recommended by the Organization for Economic Co-operation and Development for validation of QSRR model.
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The authors thank the general directorate for scientific research and technological development of the Algerian ministry of high education and scientific research for supporting this work and Kim Koffolt for her help to improve the write-up quality of this paper.
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This study was funded by the general directorate for scientific research and technological development of the Algerian ministry of high education and scientific research.
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Touhami, I., Haddag, H., Didi, M. et al. Contribution of Modified Harary Index to Predict Kováts Retention Indices for a Set of PAHs. Chromatographia 79, 1023–1032 (2016). https://doi.org/10.1007/s10337-016-3120-2
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DOI: https://doi.org/10.1007/s10337-016-3120-2