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Silk Fibroin

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INCI Name: SILK POWDER
Mesh: 2-40μm; 350nm
Total nitrogen: ≥14.5
PH: 5.0-7.0
Appearance: White or grayish yellow powder
Availability:


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


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