HPAEC-PAD analysis of hydrolysis products from aldopentauronic acid and xylans generated by recombinant SpGlcA115A. (a) Standards, (b) hydrolysis products from Xyl-Xyl(MeGlcA)-Xyl-Xyl, (c) hydrolysis products from birchwood xylan, (d) hydrolysis products from beechwood xylan. Abbreviations: Xyl, xylose; Xyl2, xylobiose; Xyl3, xylotriose; Xyl4, xylotetraose; MeGlcA, 4-O-methyl-d-glucuronic acid; GlcA, glucuronic acid.