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Main phenolic compounds present in the hydrophilic extracts of spent coffee grounds.
| Compound | Rt * | Concentration (mg/100 g D.W.) | Contribution (%) |
|---|---|---|---|
| Quinic acid | 0.9 | 656.43 ± 47.92 | 73.59 ± 5.37 |
| Gallic acid | 1.59 | 6.63 ± 0.80 | 0.74 ± 0.09 |
| Caffeic acid | 4.19 | 36.79 ± 10.06 | 4.12 ± 1.13 |
| Coumaric acid | 5.09 | 1.28 ± 0.33 | 0.14 ± 0.04 |
| Ferulic acid | 5.53 | 37.37 ± 3.64 | 4.19 ± 0.41 |
* Rt = retention time (min) (Supplementary Materials Files S1–S5).
