Table 2.
HPLC analysis of non-volatile compounds in cold brew coffee after different treatments during storage.
| Detected Component (mg/L) | Storage Days (d) | Control Group | IEF-1 Group | IEF-2 Group | HTST Group |
|---|---|---|---|---|---|
| Caffeine | 0 | 730.8 ± 4.13c | 816.9 ± 3.67a | 823.8 ± 3.93a | 730.3 ± 1.69b |
| 14 | 857.7 ± 6.27d | 927.4 ± 4.93c | 962.6 ± 3.93a | 948.0 ± 8.04b | |
| 28 | 795.3 ± 0.44c | 769.9 ± 1.18d | 840.8 ± 1.71b | 849.6 ± 1.51a | |
| Chlorogenic Acid | 0 | 173.5 ± 0.18d | 192.7 ± 1.62b | 199.2 ± 1.12a | 187.4 ± 1.24c |
| 14 | 193.0 ± 0.27c | 167.3 ± 1.32d | 220.9 ± 1.73a | 209.9 ± 2.31b | |
| 28 | 174.4 ± 0.57c | 168.5 ± 0.49d | 180.5 ± 0.86b | 183.9 ± 0.18a | |
| Trigonelline | 0 | 210.6 ± 0.48d | 236.1 ± 1.14a | 224.5 ± 0.99c | 228.9 ± 1.58b |
| 14 | 243.6 ± 0.42c | 213.5 ± 1.81d | 250.1 ± 0.91b | 266.8 ± 2.69a | |
| 28 | 224.7 ± 0.81b | 218.8 ± 0.49d | 230.4 ± 1.11c | 239.0 ± 0.13a |