Analytical Sciences

Xylitol Separation from a Polyol Mixture Using Lanthanide Ion-loaded Resins

Yusuke KITAMURA, Rika SHOBU, Hirotaka MATSUURA, Akinori JYO, and Toshihiro IHARA

Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan

Xylitol separation from a polyol mixture of the byproducts from bioethanol production processes was performed by liquid chromatography using short columns packed with lanthanide ion-loaded ion-exchange resins. Xylitol was successfully separated with sufficiently high resolution using adsorbents with medium rare-earth metal ions, such as Nd³⁺ and Sm³⁺. The adsorbents’ specific nature is explained by the so-called “gadolinium break,” which is known as a discontinuous behavior of thermodynamic parameters in complexation of the lanthanide series. From the observed behavior, the optimum lanthanide ions could be chosen to prepare appropriate adsorbents for ligand-exchange chromatography of given polyol mixtures.

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