Table 5.
Identification and quantification of phenolic compounds present in pineapple by-products by HPLC analysis. Evaluation of stem and peel liquid fractions.
| Phenolic Compounds | Chemical Formula | tR (min) | λmax (nm) | Stem Juice (mg/L) | Peel Juice (mg/L) |
|---|---|---|---|---|---|
| Gallic acid | C7H6O5 | 14.38 | 280.0 | BQL | BQL |
| Hydroxytyrosol | C8H10O3 | 21.41 | 280.0 | n.d. | BQL |
| Chlorogenic acid | C16H18O9 | 30.08 | 325.7 | 1.31 ± 0.04 | 0.85 ± 0.07 |
| p-hydroxybenzoic acid | C7H6O3 | 33.86 | 329.3 | 0.82 ± 0.04 | n.d. |
| Cryptochlorogenic acid | C16H18O9 | 34.69 | 303.3 | BQL | n.d. |
| 2,5-dihydroxybenzoic acid | C7H6O4 | 35.27 | 241.5 | BQL | BQL |
| Caffeic acid | C9H8O4 | 36.14 | 304.2 | BQL | 13.08 ± 0.01 |
| Syringaldehyde | C9H10O4 | 42.62 | 310.0 | BQL | BQL |
| Ferulic acid | C10H10O4 | 48.49 | 318.6 | 0.52 ± 0.04 | 1.69 ± 0.02 |
Abb.: Retention time, tR; UV maximum absorbance, λmax; Non-detected, n.d.; Below quantification limit, BQL.