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Table 1 Structures of GAX oligosaccharides and their migration positions by DASH expressed in glucose units (GU)

From: Development of an oligosaccharide library to characterise the structural variation in glucuronoarabinoxylan in the cell walls of vegetative tissues in grasses

Nomenclature Structure Unknown structure MALDI-CID or NMR figure Glucose units
U(4Me)2X 4-O-Me-α-GlcpA-(1 → 2)-β-Xylp-(1 → 4)-Xylp N1 S3 0.72
X Xylp    0.80
U2XX α-GlcpA-(1 → 2)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N2   1.40
U(4Me)2XX 4-O-Me-α-GlcpA-(1 → 2)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N3 S4 1.48
X2 β-Xylp-(1 → 4)-Xylp    1.57
XU 2 XX β-Xylp-(1 → 4)-[α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    2.03
XU (4Me)2 XX β-Xylp-(1 → 4)-[4-O-Me-α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    2.07
X3 β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    2.24
A3X α-Araf-(1 → 3)-β-Xylp-(1 → 4)-Xylp N4 S5 2.31
A3U(4Me)2XX α-Araf-(1 → 3)-β-Xylp-(1 → 4)-[4-O-Me-α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N10 S8 2.74
XA3X β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-Xylp N5 S6 2.87
B2,3U(4Me)2XX or
D2,3U(4Me)2XX
Araf-(1 → 2)-α-Araf-(1 → 3)-β-Xylp-(1 → 4)-[α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp
β-Xylp-(1 → 2)-α-Araf-(1 → 3)-β-Xylp-(1 → 4)-[α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp
N11 S9 3.09
D2,3X β-Xylp-(1 → 2)-α-Araf-(1 → 3)-β-Xylp-(1 → 4)-Xylp M1 S12 3.12
X4 β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    3.17
A3A3X α-Araf-(1 → 3)-β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-Xylp N6 (Z1) 5A 3.70
A3XXX α-Araf-(1 → 3)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N7 (Z2) 5B 3.85
XA 3 XX β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    3.92
D2,3XX β-Xylp-(1 → 2)-α-Araf-(1 → 3)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N8 (Z3) 5C
5D
3.97
XA3XU(4Me)2XX β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-[4-O-Me-α-GlcpA-(1 → 2)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp N12 S10 4.01
X5 β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    4.32
XA3A3X β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-[α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-Xylp N9 S7 4.47
XD2,3XX β-Xylp-(1 → 4)-[β-Xylp-(1 → 2)-α-Araf-(1 → 3)]-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp M2 S11 4.83
X6 β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-β-Xylp-(1 → 4)-Xylp    5.54