The chemical compositions of the spruce, holocelluose fibers and Kraft fibers are presented in4142Table 1. Beginning from 100 g of “virgin” spruce sticks, both PAA and Kraft methods removed4344most of the lignin (1.5 g and 4.5 g remaining after the PAA and Kraft processes, respectively, out4546of initial lignin content of 21.0 g). Most of the cellulose was preserved (44.3 g for PAA and 45.2474849g for Kraft, out of 46.6 g). Significant differences were observed with respect to hemicellulose content. Hemicellulose xylan was largely preserved in both PAA and Kraft methods (5.9 g for52PAA and 5.2 g for Kraft, out of initial 6.8 g). Half of the glucomannan was preserved after PAA treatment (12.3 g remaining out of 21.1 g), and much less after Kraft treatment (4.4 g remaining).