Table 4.
Groups of CQA compounds identified by LC-PDA-ESI-MS/MS in coffee.
| No. | Compounds | Rt (min) |
[M-H]- | MS-MS |
|---|---|---|---|---|
| 1 | 3,4-di-O-caffeoylquinic acid | 2.95 | 515.143 | 353.096; 191.068; |
| 2 | 3,5-diO-caffeoylquinic acid | 3.30 | 515.145 | 353.096; 191.066 |
| 3 | 1-O-caffeoylquinic acid | 3.83 | 353.095 | 191.096; 179.042 |
| 4 | 3,4,5-tri-O-caffeoylquinic acid | 4.02 | 677.1816 | 353.0576, 191.0683 |
| 5 | 3-O-caffeoylquinic acid | 4.25 | 353.096 | 191.069; 179.048; 135.059 |
| 6 | 5-O-caffeoylquinic acid | 4.56 | 353.096 | 191.069 |
| 7 | 3-O-feruloylquinic acid | 5.24 | 367.1126 | 191.0689 |
| 8 | 3-O-p-coumaroylquinic acid | 5.40 | 337.0996 | 191.0685 |
| 9 | cis-3,5-di-O-caffeoylquinic acid | 5.76 | 515.121 | 353.096; 193.062; |
| 10 | 5-O-feruloylquinic acid | 6.06 | 367.112 | 193.064; 173.059 |
| 11 | 4-O-p-coumaroylquinic acid | 6.37 | 337.087 | 161.038; 135.059 |
| 12 | 5-O-p-coumaroylquinic acid | 6.47 | 337.0968 | 191.0697 |
| 13 | cis-3-O-feruloylquinic acid | 6.59 | 367.1129 | 191.0689 |
| 14 | 4,5-di-O-caffeoylquinic acid | 7.71 | 515.12 | 353.094; 191.069 |
| 15 | cis-4,5-di-O-caffeoylquinic acid | 8.41 | 515.114 | 353.098; 191.069 |