“…Spruce sawdust is a low cost industrial waste material available in large quantities (El-Saied et al, 2017;Kovacova et al, 2019). In native softwood, the dominant hemicelluloses are acetyl-galactoglucomannan (Ac-GGM) amounting to 14 -20% of wood (Willför et al, 2008;Xu et al, 2010) and arabinoglucuronoxylans (AGX) for approximatively 10%.…”