Involved in the degradation of lignocellulosic biomass. Catalyzes the oxidative cleavage of glycosidic bonds in cellulosic substrates via a copper-dependent mechanism. Degrades phosphoric acid swollen cellulose (PASC) to oxidized cellooligosaccharides with degrees of polymerization of 4-8. Also shows activity on agricultural fiber paper pulps such as flax pulp. Is not active on chitin. [(1->4)-beta-D-glucosyl]n+m + reduced acceptor + O2 = [(1->4)-beta-D-glucosyl]m-1-(1->4)-D-glucono-1,5-lactone + [(1->4)-beta-D-glucosyl]n + acceptor + H2O. Glycan metabolism; cellulose degradation. The purification method developed for LPMOs can be a cheap, simple and fast solution for the purification of these enzymes for industrial applications. In addition, the activity of SamLPMO10C shows the potential of LPMOs in lignocellulosic biomass valorization.