Table 3.
Polyphenolic compounds and isothiocyanates detected in kale, radish sprouts and radish analyzed by HPLC chromatogram
| Polyphenols | Contents (μg/g of weight) | |||||
|---|---|---|---|---|---|---|
| Kale | Radish sprout | Radish | ||||
| Extractsa | Raw materialsb | Extracts | Raw materials | Extracts | Raw materials | |
| Gallic acid | 74.5 | 0.59 | ND | ND | 29.2 | 0.79 |
| Chlorogenic acid | 818.6 | 6.48 | 663.4 | 10.65 | ND | ND |
| Caffeic acid | 503.2 | 3.98 | 135.9 | 2.18 | ND | ND |
| p-Coumaric acid | 158.3 | 1.25 | ND | ND | ND | ND |
| Rutin | 239.1 | 1.89 | 238.1 | 3.82 | 250.7 | 6.75 |
| Ferulic acid | ND | ND | 57.0 | 0.92 | ND | ND |
| Sinapic acid | 376.2 | 2.98 | ND | ND | ND | ND |
| Daidzein | 74.3 | 0.59 | ND | ND | ND | ND |
| Quercetin | ND | ND | 50.5 | 0.81 | ND | ND |
| Genistein | ND | ND | ND | ND | ND | ND |
| Allyl ITC | ND | ND | 215.2 | 3.45 | ND | ND |
| Benzyl ITC | ND | ND | 59.8 | 0.96 | 70.4 | 1.90 |
| Phenyl ITC | ND | ND | ND | ND | ND | ND |
| Phenylethyl ITC | 5.70 | 0.05 | ND | ND | ND | ND |
| Moisture content (%) | 91.24 | 93.95 | 93.54 | |||
| Methanol extraction yield (%) | 9.04 | 26.53 | 41.70 | |||
aConcentration of polyphenolic compounds from methanolic extracts
bCalculation of each polyphenol and ITC in the vegetables based on moisture contents and methanol extraction yield. The formula is following: Raw materials contents = (1 − moisture content) × methanol extraction yield × content of each extract