| pH | 总黄酮提取率 Extraction rate of total flavonoids (mg∙g−1) | 颜色 Colour |
| 3 | 52.2 | 浅黄Light yellow |
| 4 | 53.03 | 浅黄Light yellow |
| 5 | 56.51 | 浅黄Light yellow |
| 6 | 56.96 | 浅黄Light yellow |
| 7 | 56.35 | 棕黄Brown yellow |
| 8 | 52.97 | 棕黄Brown yellow |
| 9 | 51.98 | 棕黄Brown yellow |
| 10 | 51.15 | 棕黄Brown yellow |
| 11 | 49.82 | 棕黄Brown yellow |