Table 1.
Yields and chemical properties of polysaccharides obtained from Aster scaber by different extraction methods. ASWP, a polysaccharide fraction obtained by hot water extraction; ASEP-A, a polysaccharide fraction obtained using an α-amylase-assisted extraction; ASEP-C, a polysaccharide fraction obtained using cellulase-assisted extraction; and ASEP-P, a polysaccharide fraction obtained using pectinase-assisted extraction from Aster scaber. Values are mean ± standard deviation, n = 3. Values followed by the different letter in the same row are significantly different (p < 0.05). (1) Percentage (%) in dried extract. (2) KDO, 2-keto-3-deoxy-mannooctanoic acid.
| Samples | ASWP | ASEP-A | ASEP-C | ASEP-P |
|---|---|---|---|---|
| Yield (%) | 3.3 ab | 3.4 ab | 3.1 b | 3.8 a |
| Chemical composition (%) (1) | ||||
| Neutral sugar | 45.7 b | 59.9 a | 44.6 b | 58.5 a |
| Uronic acid | 51.6 a | 39.1 b | 54.1 a | 40.1 b |
| Protein | 2.3 a | 0.6 bc | 0.7 b | 0.3 c |
| KDO (2)-like material | 0.4 b | 0.4 b | 0.6 b | 1.2 a |
| Component sugar (molar ratio) | ||||
| Fucose | 0.06 | 0.18 | 0.05 | 0.23 |
| Rhamnose | 0.44 | 1.59 | 0.62 | 2.08 |
| Arabinose | 1.00 | 0.75 | 1.25 | 1.11 |
| Galactose | 0.44 | 1.14 | 0.67 | 1.74 |
| Glucose | 1.00 | 1.00 | 1.00 | 1.00 |
| Mannose | 0.01 | 0.19 | 0.02 | 0.17 |
| Xylose | 0.03 | 0.13 | 0.05 | 0.14 |
| Galacturonic acid | 3.15 | 1.50 | 2.63 | 2.03 |
| Glucuronic acid | 0.05 | 0.13 | 0.04 | 0.18 |