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Table 2 Carbohydrate composition (μg/mg dry weight) of untreated control and hydrothermally pretreated wheat bran following sequential extraction

From: Characterization of cell wall components of wheat bran following hydrothermal pretreatment and fractionation

  a Yield (g) Rhamnose Fucose Arabinose Xylose Mannose Galactose Glucose GlcA Total
Ctrl AIR 2.02 1.4 ± 0.3 0.7 ± 0.1 228 ± 3 291 ± 3 5.5 ± 0.1 15.2 ± 1.2 185 ± 2 42.8 ± 0.5 769 ± 3
Ctrl HW 0.02 nd nd 139 ± 2 228 ± 3 8.3 ± 0.3 17.6 ± 1.1 140 ± 2 35.1 ± 0.4 568 ± 4
Ctrl 0.5 mol/L 0.15 nd nd 167 ± 3 223 ± 4 1.7 ± 0.1 8.1 ± 0.3 162 ± 1 32.3 ± 0.3 594 ± 5
Ctrl 1 mol/L 0.18 nd nd 190 ± 4 433 ± 6 2.9 ± 0.2 8.3 ± 0.4 177 ± 2 31.1 ± 0.3 841 ± 8
Ctrl 4 mol/L 0.20 nd nd 196 ± 4 466 ± 5 1.1 ± 0.1 10.4 ± 1.6 173 ± 2 25.2 ± 0.2 871 ± 6
Ctrl residue 1.00 nd nd 83 ± 2 103 ± 3 0.8 ± 0.1 3.3 ± 0.8 204 ± 2 30.6 ± 0.5 425 ± 6
180°C AIR 2.05 nd nd 126 ± 2 188 ± 2 5.5 ± 0.6 14.1 ± 1.6 220 ± 4 40.6 ± 1.1 593 ± 7
180°C HW 0.05 nd nd 119 ± 2 192 ± 3 6.1 ± 0.8 15.3 ± 1.2 185 ± 3 32.1 ± 0.5 550 ± 6
180°C 0.5 mol/L 0.16 nd nd 228 ± 3 290 ± 2 1.0 ± 0.2 6.4 ± 1.1 196 ± 2 27.8 ± 0.3 749 ± 6
180°C 1 mol/L 0.17 nd nd 190 ± 2 289 ± 3 1.8 ± 0.3 6.7 ± 1.1 85 ± 1 29.2 ± 0.3 601 ± 5
180°C 4 mol/L 0.24 nd nd 75 ± 1 185 ± 2 1.2 ± 0.4 9.3 ± 2.0 86 ± 1 21.6 ± 0.4 379 ± 3
180°C residue 0.76 nd nd 63 ± 1 97 ± 1 0.7 ± 0.1 2.6 ± 0.5 265 ± 2 28.3 ± 0.3 457 ± 5
200°C AIR 1.98 nd nd 101 ± 1 152 ± 2 5.5 ± 0.5 13.5 ± 1.1 242 ± 3 37.8 ± 0.8 551 ± 6
200°C HW 0.07 nd nd 92 ± 2 107 ± 2 5.9 ± 0.5 13.8 ± 1.2 184 ± 1 24.2 ± 0.5 427 ± 4
200°C 0.5 mol/L 0.19 nd nd 207 ± 4 218 ± 3 1.4 ± 0.4 5.8 ± 0.3 153 ± 1 27.9 ± 0.7 613 ± 6
200°C 1 mol/L 0.19 nd nd 102 ± 2 238 ± 4 2.2 ± 0.2 6.8 ± 0.2 75 ± 1 29.7 ± 0.6 453 ± 4
200°C 4 mol/L 0.25 nd nd 76 ± 1 161 ± 3 1.3 ± 0.1 8.2 ± 0.7 88 ± 2 28.9 ± 0.8 364 ± 3
200°C residue 0.71 nd nd 59 ± 1 95 ± 2 0.4 ± 0.1 1.6 ± 0.2 291 ± 3 28.0 ± 0.5 476 ± 5
  1. Residue represents the insoluble material after fractionation. Values are expressed as means of duplicate analysis ± SD.
  2. GlcA glucuronic acid, Ctrl untreated control, nd none detected.
  3. aYield is the dry weight of fraction recovered after sequential extraction of the AIR in hot water (HW) and progressively stronger alkali (0.5, 1 and 4 mol/L KOH).