silk protein powder, silk peptide, silk amino acids, sericin, pearl powder, natural silk cosmetics
It is a kind of powdery high molecular protein with a molecular of 100,000, which is no taste, no smell, and is micro-dissolved in water, but not in ethanol. For making the silk cosmetics, the fineness of silk powder is generally between 1-100µ,if the grain size is too big, the smoothness of silk powder shall be poor,and give people the feeling of crude, but it would spoil the structure of natural silk material if the grain size is too fine. Since the surface gloss of silk is caused by the light interference effect on the silk surface, the fineness should be treated properly during the production process for silk powder, so as to keep the best standards of fineness, as well as the unique natural luster of it.
Table: Physicochemical, hygienic indexes of silk powder
Item
Index
exterior
white or gray
character
no abnormal smell
average fineness, µm
(1)≤90 (2)≤5
nitrogen content ,% (W/W)
≥14.0
pH value
5.0-7.5
drying shrinkage ,% (W/W)
≤6.5
burning residue ,% (W/W)
≤2.0
(Hg)
(As)
(heavy metal content) (Pb)
≤1.0
≤2.0
≤20.0
(aerobic bacterial count ,num/g)
≤100
fecal coliforms
nondetactale
pseudomonas aeru
nondetactale
staphylococcus aureus
nondetactale |
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