Adsorption equilibria of arabinose, fructose, galactose, glucose, mannose, rhamnose, sucrose, and xylose were evaluated on four different types of ion-exchange resins. The resins were strong acid cation (SAC), strong base anion (SBA), weak base anion (WBA), and weak acid cation (WAC) in typical ion forms (Na(+) and SO(4)(2-)) and had similar cross-linking degrees (divinylbenzene content between (5 and 6) %) and bead sizes. The single-component isotherms of the sugars were determined at 65 degrees C by a static method. The equilibrium data were described with linear isotherms over the concentration range between (0 and 350) g.L(-1). The decomposition of sugars was analyzed by high-performance liquid chromatography (HPLC) measurements. The use of the WAC exchange resin is especially restricted due to the decomposition of sugars under the typical operating conditions of the resin. The WBA exchange resin showed high selectivity for xylose and arabinose. The SBA exchange resin also demonstrated good selectivity for xylose and rhamnose, which implies that these could be separated from biomass hydrolysates with the SBA exchange resin.