| Groups | Surface | Solubility | Phenol sulfuric acid reaction | The uronic acid content/% | I-IK reaction | |
| Water | Organic solvent | |||||
| PP1 | White flocculent | Soluble in cold water | Insoluble | Positive | 57.4 | Negative |
| PP2 | Pale yellow flocculent | Slightly soluble in hot water | Insoluble | Positive | 27.5 | Negative |