Table 4. Quantitative changes of DNJ and GABA in mulberry leaves of seven different cultivars by harvest season
| Cultivar1) | Harvest season | Contents (mg/100 g, dry weight)2) |
| DNJ | GABA |
| GR | June | 179.3 | 184.9 |
| September | 144.6 | 82.3 |
| GS | June | 108.5 | 177.3 |
| September | 91.1 | 93.9 |
| SG | June | 187.2 | 161.4 |
| September | 141.5 | 131.7 |
| SI | June | 170.5 | 153.6 |
| September | 154.3 | 121.4 |
| YC | June | 142.8 | 207.4 |
| September | 79.9 | 171.9 |
| CI | June | 155.2 | 183.6 |
| September | 84.8 | 114.7 |
| HO | June | 196.9 | 188.0 |
| September | 102.1 | 132.8 |
1)GR, Gaeryang; GS, Geomseol; SG, Sugae; SI, Sinil; YC, Yongcheon; CI, Cheongil; HO, Hongol.
2)Each value is presented as mean of duplicate determinations.