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Molecular connectivity and retention indexes

Y Michotte, D L Massart

    Journal of Pharmaceutical Sciences
    |November 1, 1977
    PubMed
    Summary

    Molecular connectivity indexes (chi) showed poor correlation with retention volumes in gas-liquid chromatography (GLC) for several organic compounds. This suggests limited utility of chi for predicting biological activities.

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    Area of Science:

    • Quantitative Structure-Activity Relationships (QSAR)
    • Cheminformatics
    • Physical Organic Chemistry

    Background:

    • Molecular connectivity indexes (chi) are topological descriptors used to predict physicochemical properties and biological activities.
    • Gas-liquid chromatography (GLC) is a common technique for separating and analyzing volatile compounds.
    • Previous studies have explored the correlation between chi and chromatographic behavior.

    Purpose of the Study:

    • To evaluate the effectiveness of molecular connectivity indexes (chi) in predicting retention volumes in GLC.
    • To assess the potential limitations of using chi for predicting biological activities based on chromatographic behavior.

    Main Methods:

    • Calculation of molecular connectivity indexes (chi) for various alcohols, ethers, esters, and ketones.
    • Measurement of retention volumes for these compounds using gas-liquid chromatography (GLC) systems.

    Main Results:

    • A weak correlation was observed between the molecular connectivity indexes (chi) and the retention volumes of the tested compounds.
    • The predictive power of chi for chromatographic behavior in these GLC systems was found to be limited.

    Conclusions:

    • Molecular connectivity indexes (chi) may not be universally applicable for predicting chromatographic retention in all GLC systems.
    • The utility of chi for predicting biological activities, when inferred from chromatographic data, could be restricted.

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