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Abstract
The retention behavior of ten iridoid glucosides on reversed octadecylsilane and normal diol stationary phases is compared. To consider in quantitative terms the experimental results, structure-retention relationships have been studied. When free rotation around σ-bonds in the solute molecule during the chromatographic process was taken into account, increased accuracy of calculated retention was obtained. The values of positive, respectively negative contribution of the same functional groups to the solute molecule retention on each column were calculated.
ACKNOWLEDGMENT
The financial support of the Bulgarian National Foundation for Scientific Research is gratefully acknowledged. Thanks are due to Dr. M. Mitova from the Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Sciences (Sofia, Bulgaria), for providing the iridoid substances and to Prof. Ov. Mekenyan from the University of Bourgas (Bourgas, Bulgaria), for providing the OASIS software.