Abstract
Acetic acid acts as one component of the mobile phase to influence separation of puerarin from daidzin when using β-cyclodextrin-substituted media. In this work considering an explicit acetic acid solution, host-guest complexes of β-cyclodextrin (β-CD) with puerarin and daidzin were investigated by molecular dynamics simulations. Computational results indicate different shuttle motions of puerarin and daidzin inside the cavity of β-CD. A model detailing the shuttle motion was constructed, and the relationships between shuttle depth and guest rotation angles, hydrogen bonds, and host-guest interaction energies were analyzed. The results can be used to explain the chromatographic retention mechanisms of puerarin and daidzin with β-CD, and to explore the complexity of host-guest interactions involving β-CD.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (20876011), 863 program (2006AA02Z245, 2007AA100404), 973 program (2007CB714304), Beijing Municipal Science & Technology Commission (Z09010300840901), and special funds of cooperation project of Beijing Municipal Education Commission.
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Zhang, H., Feng, W., Li, C. et al. A model for the shuttle motions of puerarin and daidzin inside the cavity of β-cyclodextrin in aqueous acetic acid: insights from molecular dynamics simulations. J Mol Model 18, 221–227 (2012). https://doi.org/10.1007/s00894-011-1036-1
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DOI: https://doi.org/10.1007/s00894-011-1036-1