Adsorption of Stilbenoids on Silica

K. E. Polunin, P. N. Kolotilov, V. M. Voitova, A. V. Larin, and I. A. Polunina

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
31 Leninskii pr., Moscow, 119991 Russia

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Received June 02, 2009

Abstract — TLC, HPLC, and statistical methods are used to study the adsorption of stilbenoids from organic solvents on SiO₂ in a wide range of concentrations. The dependence of adsorption of trans-stilbene hydroxy and methoxy derivatives on the nature of functional groups, their amount and position in the molecular structure, and also on the concentration and proton–acceptor properties of the polar component of the binary organic solvent is found. It is shown that experimental isotherms of stilbenoid adsorption on aerosil from the mixture of n-hexane and ethyl acetate are well approximated by the Freundlich equation. The adsorption of stilbenoids and phenols on SiO₂ is compared. It is found that adsorption properties of phenols and hydroxystilbenes with a similar number of OH groups are practically similar.