Isomerization of Hemicellulose Aldoses to Ketoses Catalyzed by Basic Anion Resins: Catalyst Screening and Stability Studies

Isomerization of aldoses to ketoses is an essential step in carbohydrate valorization routes biorefineries produce a wide variety bioproducts. In this work, selective isomerization into was investigated using different commercial Brønsted basic anion resins at low temperature conditions. Weak and strong were tested under reaction Amberlite IRA-900 Amberlyst A-26 (strong resins) IRA-67 A-21 (weak assess their catalytic properties. Strong provided high yields fructose. also the sugar monosaccharides conventionally present lignocellulosic biomass (xylose, arabinose, galactose, glucose mannose) aiming explore performance material hemicellulose-derived mixtures. Very promising observed for IRA-900, yielding fructose selectivity higher than 75% yield 27% reaction. Notably, anionic not suitable reuse cycles, although use organic cosolvents, specifically ethanol, improved reusability resins.