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Retention time in minutes and absorption maxima in the range 200–400 nm for phenolic acids in the HPLC method.
| Phenolic Acid Standard | Retention Time [min] | λmax [nm] |
|---|---|---|
| gallic acid | 3.78 | 227.5; 271.0 |
| protocatechuic acid | 6.37 | 227.5; 258.6; 294.0 |
| gentisic acid | 12.23 | 234.9; 326.9 |
| vanillic acid | 14.05 | 226.4; 260.5; 291.0 |
| caffeic acid | 14.95 | 239.0; 322.6 |
| syringic acid | 16.85 | 224.7; 273.3 |
| p-coumaric acid | 26.12 | 228.7; 308.9 |
| ferulic acid | 31.93 | 234.9; 322.6 |
| chlorogenic acid | 41.75 | 234.9; 300.3 |
