In the study on hemicelluloses from Elm wood, researchers found that the hemicellulose has two types of xylose molecules linked to xylogluconic acids - one with xylose connected to C1 and C4, and the other with xylose linked at C2 or C3. They discovered that the molecular ratio of the two xylose types is about 8:1. The hemicellulose mostly contains β-xylose residues, as indicated by its similar properties to β-methyl xyloside and different from α-methyl xyloside. This indicates that the hemicellulose mainly contains one specific type of xylose residues.