Silk fibroin (silk protein hydrolysate) is a natural moisturizing factor (NMF) with the amino acid content of silk protein,which can beneficially rebuild the skin's moisturizing system.Silk fibroin serum is known for its excellent moisturizing and anti-aging properties,as well as soothing and antioxidant effects.Silk fibroin hydrogel has a significant antioxidant effect and forms a protective peptide coating to protect the skin from harmful effects.It retains moisture and provides a soft touch.The silk fibroin film was developed to accelerate wound healing and can be peeled off without damaging the newly formed skin.
| ITEM | SPECIFICATION | TEST METHOD |
| Appearance | white or light yellow powder | Sensory test |
| Dissolvable Level | Liable to dissolve | / |
| Nitrogen | ≥14.5% | Kjeldahl method |
| PH (5% Aqueous Solution) | 5.00-7.50 | QB 2732-2005 |
| Ash | ≤4.0% | GB/T 5009.4 |
| Loss on drying | ≤4.0% | GB/T 5009.3 |
| Pb | <0.5 PPM | GB 5009.12 |
| As | <0.5 PPM | GB/T 5009.11 |
| Hg | <0.5 PPM | GB/T 5009.17 |
| Cr | <2.0 PPM | GB/T 5009.123 |
| Total Plate Count | <1000cfu/g | GB/T 4789.2 |
| Mold & Yeast | ≤50 CFU/g | GB/T 4789.15 |
| E.Coli | ≤0.4 MPN/g | GB/T 4789.3 |
| Salmonella | Negative | GB/T 4789.4 |