Table 3. Differential metabolites identified in Korean black raspberry during ripening stages analyzed by GC-IT-MS.
| No. | RT (min)1 | VIP value | Identified ion (m/z)2 | Putative metabolites3 | Derivatized4 | p-value | ID5 |
| 1 | 4.41 | 1.21 | 147 | oxalic acid | (TMS)2 | 0.005 | STD |
| 2 | 6.08 | 1.15 | 299 | phosphoric acid | (TMS)3 | 0.003 | STD |
| 3 | 8.91 | 1.09 | 147 | malic acid | (TMS)3 | 0.021 | STD |
| 4 | 9.32 | 0.95 | 147, 232 | L-aspartic acid | (TMS)3 | 0.023 | STD |
| 5 | 9.42 | 1.33 | 156 | pyroglutamic acid | (TMS)2 | 0.005 | STD |
| 6 | 9.46 | 1.17 | 174 | γ-aminobutyric acid (GABA) | (TMS)3 | 0.002 | STD |
| 7 | 12.66 | 1.46 | 273 | citric acid | (TMS)4 | 0.005 | STD |
| 8 | 13.16 | 1.33 | 217 | D-fructose | MeOX (TMS)5 | 0.034 | STD |
| 9 | 13.42 | 1.70 | 148, 217 | D-glucose | MeOX (TMS)5 | 0.000 | STD |
| 10 | 14.06 | 1.24 | 281 | gallic acid | (TMS)4 | 0.000 | STD |
| 11 | 15.02 | 1.07 | 313 | palmitic acid | TMS | 0.013 | STD |
| 12 | 16.57 | 1.49 | 339 | oleic acid | TMS | 0.001 | STD |
| 13 | 16.78 | 1.63 | 117,341 | stearic acid | TMS | 0.000 | STD |
| 14 | 19.72 | 1.16 | 361 | sucrose | (TMS)8 | 0.004 | STD |
| 15 | 23.65 | 1.44 | 237 | α-tocopherol | TMS | 0.000 | STD |
1
Retention time.
2
m/z are the selected ion(s) for identification and quantification of individual derivatized metabolites.
3
Identified metabolites based on variable importance projection (VIP) analysis with cut-off value of 0.7 and a p-value<0.05.
4
MEOX, methyloxime; TMS, trimethylsilyl.
5
Identification: STD, mass spectrum was consistent with that of standard compound (MSI level 1).