Table 1.
Cultivars | Parts | Quercetin 7,4′-diglucoside | Quercetin 3-glucoside | Quercetin 4′-glucoside | Quercetin | Total | |
---|---|---|---|---|---|---|---|
Red onion | Outer | First SLa | 17.31 | 7.04 | 41.39 | 0.59 | 66.33 |
Second SL | 4.52 ± 0.48 | 1.10 ± 0.14 | 5.70 ± 0.61 | 0.03 ± 0.00 | 11.33 ± 1.20 | ||
Third SL | 0.54 ± 0.02 | 0.10 ± 0.01 | 0.56 ± 0.04 | NDb | 1.20 ± 0.06 | ||
Inner | 0.04 ± 0.01 | 0.01 ± 0.00 | 0.07 ± 0.01 | ND | 0.12 ± 0.03 | ||
Yellow onion | First SL | 6.92 ± 0.95 | 0.69 ± 0.10 | 9.04 ± 1.20 | 0.07 ± 0.02 | 16.71 ± 2.27 | |
Second SL | 0.72 ± 0.14 | 0.11 ± 0.02 | 0.75 ± 0.14 | ND | 1.58 ± 0.30 | ||
Third SL | ND | ND | ND | ND | ND | ||
Inner | ND | ND | ND | ND | ND | ||
Chartreuse onion | First SL | 11.30 ± 0.75 | 5.66 ± 0.45 | 21.72 ± 1.63 | 0.35 ± 0.26 | 39.02 ± 2.57 | |
Second SL | 1.42 ± 0.01 | 0.44 ± 0.02 | 1.73 ± 0.12 | ND | 3.60 ± 0.15 | ||
Third SL | 0.38 ± 0.04 | 0.18 ± 0.01 | 0.69 ± 0.06 | ND | 1.25 ± 0.11 | ||
Inner | ND | ND | ND | ND | ND | ||
Commercial chartreuse onion | First SL | 9.29 ± 0.85 | 1.35 ± 0.12 | 20.27 ± 1.92 | 32.81 ± 1.63 | 63.71 ± 4.52 | |
Second SL | 5.24 ± 1.58 | 0.70 ± 0.22 | 8.26 ± 2.42 | 9.88 ± 2.54 | 24.09 ± 6.75 | ||
Third SL | 4.09 ± 0.29 | 0.76 ± 0.07 | 4.83 ± 0.34 | 0.50 ± 0.12 | 10.18 ± 0.59 | ||
Inner | 0.44 ± 0.11 | 0.09 ± 0.03 | 0.48 ± 0.14 | 0.03 ± 0.02 | 1.04 ± 0.30 |
SL, scaly leaf; the number of SL 1 is the outermost part of onion skin.
ND, not detected.