Table 1
Summary of HMT derivatives detected by GC–MS with their corresponding retention time and molecular ion detected.
| H2O:CH3OH:NH3 | ||||||||
|---|---|---|---|---|---|---|---|---|
| N∘ | Species | Ret. time | Molec. ion | Exp. 1 | Exp. 2 | Exp. 3 | Exp. 4 | Exp. 5 |
| min | ion g/mol | (7:1:2) | (7:1:2) | (2:1:2) | (2:1:2) | (2:1:1) | ||
| 7 days | 6 days | 3 days | 1 day | 1/2 day | ||||
| 1 | HMT | 14.10 | 140 | 100 | 100 | 100 | 100 | 100 |
| 2 | HMT-CH3 | 15.83 | 154 | 3 | 4 | 3 | 25 | 19 |
| 3 | HMT-CH2NH2 | 17.08 | 169 | – | – | – | 3 | 1 |
| 4 | HMT-CH2CH3 | 17.51 | 168 | – | – | – | 3 | 2 |
| 5 | HMT-NH2 | 17.53 | 155 | 1 | 2 | 2 | – | <1 |
| 6 | HMT-N=NH | 17.58 | 168 | – | – | – | 1 | <1 |
| 7 | HMT-OH | 19.18 | 156 | 4 | 4 | 4 | 1 | 1 |
| 8 | HMT-CHO | 21.78 | 168 | 2 | 1 | 2 | – | – |
| 9 | HMT-O-CH2CH3 | 22.15 | 184 | – | 1 | 3 | 16 | 7 |
| 10 | HMT-CH2OH | 22.73 | 170 | 48 | 80 | 152 | 98 | 111 |
| 11 | HMT-CO-CH3 | 23.32 | 182 | 2 | 1 | 3 | 3 | – |
| 12 | HMT-NCO | 23.62 | 182 | – | – | 2 | <1 | <1 |
| 13 | HMT-CH2-CO-CH3 | 25.07 | 196 | – | – | – | 2 | <1 |
| 14 | HMT-C2H4-CHO | 25.37 | 196 | – | – | – | <1 | <1 |
| 15 | HMT-CH2-CHO | 25.57 | 182 | – | – | 7 | 4 | 3 |
| 16 | HMT-NH-CHO | 29.35 | 183 | 10 | 10 | 5 | 3 | 3 |
| 17 | HMT-CH(CH3)-CH2NH2 | 31.24 | 168 | – | – | – | 1 | 4 |
| 18 | HMT-O-CHO | 33.78 | 184 | 5 | 2 | 2 | – | – |
Notes. The relative abundance to HMT of the derivatives is shown in each experiment. Experiments 1 and 2 were performed with the same composition and similar storage time. Experiments 3 and 4, with the same composition, were performed to compare the effect of storage time. Experiment 5 was selected as a standard.
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