Fig. 2.
Representative xyloglucan oligosaccharides. Top, decasaccharides; bottom, octasaccharides; left, structures found in most vascular plants; right, structures detected by Peña et al. (2008) in Equisetum hyemale and Selaginella kraussiana. Note the minor chemical difference (grey ovals) between the left-hand and right-hand structures. The TLC system shown in Fig. 7 would be expected to group the two similar decasaccharides together and the two similar octasaccharides together. Sugar residues are labelled in grey: Ara, α-l-arabinopyranose; Fuc, α-l-fucopyranose; Gal, β-d-galactopyranose; Glc, β-d-glucopyranose; Xyl, α-d-xylopyranose. GlcRT indicates the reducing terminal glucose group.