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Quantitative analysis of protocatechuic acid, quercetin, and their glucosides in onion extracts and their residue after dyeing procedures. Data are expressed as mean (n = 3) ± SD.
| Sample | Protocatechuic acid and Derivatives (µg PAE/mL) |
Quercetin and Derivatives (µg QE/mL) |
|---|---|---|
| ET1 | 100.0 ± 11.0 | 26.2 ± 3.1 |
| ET1-post | 91.8 ± 2.7 | 22.0 ± 0.1 |
| ET2 | 109.1 ± 4.3 | 32.4 ± 3.5 |
| ET2-post | 26.2 ± 3.1 | 15.7 ± 1.4 |
