Table 2.
Mass spectral data of photofragment ions for isobaric disaccharides
| m/z | gentiobiose (β1-6) | melibiose (α 1-6) | palatinose (α 1-6) | leucrose (α 1-5) | cellobiose (β1-4) | sucrose (α 1-2) | trehalose (α 1-1) |
|---|---|---|---|---|---|---|---|
| 184 | X | ||||||
| 186 | X | X | X | X | X | X | X |
| 201 | X | X | X | X | X | X | X |
| 202 | X | X | |||||
| 203 | X | X | X | X | X | X | X |
| 229 | X | ||||||
| 231 | X | X | X | X | X | X | X |
| 245 | X | X | X | X | X | ||
| 259 | X | X | X | X | X | ||
| 261 | X | ||||||
| 275,276a | X | X | X | X | X | ||
| 319 | X | X | |||||
| 333 | X | ||||||
| 334 | X | X | X | X | X | X | X |
| 347 | X | X | X | X | X | X |
a
The ion at m/z = 276 is the H-transfer cross-ring cleavage ion of m/z = 275. In the VUVPD spectra, the ion at m/z = 275 is a unique fragment for sucrose.