Table 1. Glucosinolate (GSL) content and enzymatically-formed nitriles in Brassica vegetables in μmol/g FW.
| GSL | nitrile (μmol/g FW) | Brussels sprouts | broccoli | cauliflower | savoy cabbage | white cabbage | red cabbage |
|---|---|---|---|---|---|---|---|
| allyl-GSL | 0.646 ± 0.046 | 0.004 ± 0.001 | 0.095 ± 0.020 | 1.292 ± 0.301 | 0.582 ± 0.193 | 0.360 ± 0.018 | |
| allyl-CN | 0.028 ± 0.008 (3%) | n.d. | 0.015 ± 0.011 (12%) | 0.094 ± 0.026 (9%) | 0.059 ± 0.024 (11%) | 0.010 ± 0.003 (3%) | |
| 3-but-GSL | 0.095 ± 0.010 | n.d. | n.d. | 0.022 ± 0.006 | 0.023 ± 0.010 | 0.224 ± 0.025 | |
| 3-but-CN | 0.008 ± 0.002 (7%) | n.d. | n.d. | n.d. | n.d. | n.d. | |
| 2-OH-3-but-GSL | 0.243 ± 0.041 | n.d. | 0.002 ± 0.005 | 0.069 ± 0.027 | 0.043 ± 0.015 | 0.458 ± 0.046 | |
| 2-OH-3-but-CN | n.d. | n.d. | n.d. | n.d. | n.d. | 0.036 ± 0.007 (10%) | |
| 3-MTP-GSL | 0.012 ± 0.001 | n.d. | 0.050 ± 0.019 | 0.027 ± 0.008 | 0.012 ± 0.008 | 0.010 ± 0.003 | |
| 3-MTP-CN | 0.007 ± 0.004 (100%) | 0.004 ± 0.002 (100%) | 0.10 ± 0.057 (91%) | 0.019 ± 0.008 (72%) | 0.006 ± 0.002 (30%) | 0.003 ± 0.001 (20%) | |
| 4-MTB-GSL | n.d. | 0.013 ± 0.013 | n.d. | n.d. | 0.007 ± 0.010 | 0.029 ± 0.008 | |
| 4-MTB-CN | n.d. | 0.005 ± 0.001 (47%) | 0.003 ± 0.001 (100%) | n.d. | n.d. | 0.005 ± 0.001 (10%) | |
| 3-MSOP-GSL | 0.707 ± 0.066 | 0.121 ± 0.013 | 0.160 ± 0.035 | 1.641 ± 0.295 | 0.609 ± 0.091 | 0.471 ± 0.061 | |
| 3-MSOP-CN | 0.188 ± 0.052 (89%) | 0.104 ± 0.154 (65%) | 0.011 ± 0.017 (41%) | 0.433 ± 0.089 (30%) | 0.177 ± 0.045 (49%) | 0.108 ± 0.012 (25%) | |
| 4-MSOB-GSL | 0.121 ± 0.019 | 0.690 ± 0.132 | n.d. | 0.096 ± 0.020 | 0.064 ± 0.023 | 1.003 ± 0.204 | |
| 4-MSOB-CN | 0.040 ± 0.017 (93%) | 0.322 ± 0.078 (54%) | n.d. | 0.031 ± 0.043 (49%) | 0.009 ± 0.012 (54%) | 0.256 ± 0.037 (22%) | |
| benzyl-GSL | 0.025 ± 0.006 | n.d. | n.d. | n.d. | n.d. | n.d. | |
| benzyl-CN | 0.030 ± 0.004 (90%) | n.d. | n.d. | n.d. | n.d. | n.d. | |
| 2-Phenylethyl-GSL | n.d. | n.d. | n.d. | 0.033 ± 0.005 | n.d. | n.d. | |
| 2-Phenylethyl-CN | 0.007 ± 0.003 (100%) | 0.001 ± 0.001 (100%) | n.d. | 0.006 ± 0.004 (41%) | n.d. | n.d. | |
| 4-OH-I3M-GSL | 0.061 ± 0.013 | 0.035 ± 0.002 | 0.026 ± 0.009 | 0.012 ± 0.006 | 0.016 ± 0.007 | 0.049 ± 0.003 | |
| I3M-GSL | 0.455 ± 0.177 | 0.169 ± 0.024 | 0.252 ± 0.057 | 0.782 ± 0.365 | 0.169 ± 0.062 | 0.207 ± 0.027 | |
| IAN | 0.093 ± 0.030 (100%) | tr | n.d. | tr | tr | n.d. | |
| 4-Methoxy-I3M-GSL | 0.113 ± 0.025 | 0.060 ± 0.004 | 0.018 ± 0.004 | 0.049 ± 0.010 | 0.038 ± 0.016 | 0.038 ± 0.004 | |
| 4-Methoxy-IAN | 0.044 ± 0.011 (100%) | n.d. | n.d. | n.d. | n.d. | n.d. | |
| 1-Methoxy-I3M-GSL | 0.012 ± 0.009 | 0.243 ± 0.070 | 0.051 ± 0.022 | 0.012 ± 0.002 | 0.020 ± 0.011 | 0.009 ± 0.003 | |
| 1-Methoxy-IAN | 0.001 ± 0.001 100%) | 0.007 ± 0.002 (100%) | n.d. | n.d. | n.d. | n.d. |
In brackets, the amounts of formed nitriles (%CN) concerning the initial GSL content are given.
Abbreviations: 3-but-GSL: 3-butenyl GSL; 2-OH-3-but-GSL: 2-hydroxy-3-butenyl GSL; 2-OH-3-but-CN: 3-hydroxy-4-pentenenitrile; 3-MTP-GSL: 3-(methylthio)propyl GSL; 4-MTB-GSL: 4-(methylthio)butyl GSL; 3-MSOP-GSL: 3-(methylsulfinyl)propyl GSL; 4-MSOB-GSL: 4-(methylsulfinyl)butyl GSL; tr: traces; n.d.: not detected.