Table 4.
Oligosaccharide structures deduced from MALDI-TOF MS analysis of peracetylated supernatant (supt) fraction of the Streptomyces sp. exo-β-(13)-D-galactanase hydrolysed dGA product
| Peaks (m/z) | % Intensity (relative intensity) | Deduced and possible predominant structures |
|---|---|---|
| 673.2 | 10 (4%) | Hex1HexA1 |
| GlcpA-(1→6)-Galp | ||
| 659.1 (701—acetyl group) | 10 (10%) | Hex2 |
| 701.2 | 12 | Galp-(1→6)-Galp |
| 933.2 | 12 (5%) | Hex1HexA2 |
| GlcpA-(1→4)-GlcpA-(1→6)-Galp | ||
| 919.2 (961—acetyl group) | 30 (62%) | Hex2HexA1 |
| 961.2 | 100 | GlcpA-(1→6)-Galp-(1→6)-Galp |
| 977.1 (961.2 K + adduct) | 10 | |
| 1177.2 | 10 (4%) | Hex2HexA1Pent1 |
| GlcpA-(1→3)-Araf-(1→6)-Galp-(1→6)-Galp | ||
| GlcpA-(1→6)-Galp-(1→3)-Araf-(1→6)-Galp | ||
| 1149.2 (1191.2—acetyl group) | 18 (15%) | Hex2HexA1DeoxyHex1 |
| 1191.2 | 15 | Rhap-(1→6)-Galp-(1→4)-GlcpA-(1→6)-Galp |
| Rhap-(1→4)-GlcpA-(1→6)-Galp-(1→6)-Galp |
Unless otherwise stated, ions appear as sodium adducts.