| Factor No. | Factor name | Level | ||
| 1 | 2 | 3 | ||
| Factor A | The type of liquid processed | Purified water | Redistilled aromatic water | Redistilled aromatic water after refrigeration and filtration |
| Factor B | The type of solubilizer | Tween 80 (0.25%) | Hydroxypropyl β-cyclodextrin (0.4%) | No solubilizer added |
| Factor C | The dosage of activated carbon | 0.05% | no activated carbon added | 0.10% |
| Factor D | Heating temperature | 80˚C, 5 min | 100˚C, 5 min | No heating process |
| Factor E | Reagents for pH adjustment | Hydrochloric acid/sodium hydroxide | Citric acid/sodium citrate | Hydrochloric acid/sodium hydroxide |
| Factor F | pH value range after adjustment | 4.5 - 4.8 | 5.5 - 5.8 | 7.5 - 7.8 |
| Factor G | Sterilization conditions | 100˚C, 30 min | 115˚C, 30 min | 121˚C, 13 min |