Materials Commercially available microcrystalline cellulose powder(Sigma-Aldrich) was used for the hydrolysis tests. The chemicalsused include sulfuric acid (1/3 p/v, Panreac), oxalic acid (98%,Sigma-Aldrich), glucose (99%, Panreac) and cellobiose (99%, Panreac). All the chemicals were used without further purification.