Silk Peptide
Silk
peptide is a kind of silk proteinic product with smaller molecular
weight consisted by a few or ten odd amino acids. Its molecular
weight is generally between 300
to 2000 with better water
soluble property but not dissolved in the high density ethanol or
ether.
The
silk peptide in large molecular weight has a good membranate
character which gives the hair natural gloss and elasticity to let
the hair easy dressing and making up. The silk peptide of low
molecular weight is easy to be absorbed by skin, and to be permeated
to the inner of hair to provide the necessary nurture for its normal
metabolism, as well as to repair the injured hair.
Application
property:
(1) Natural moisture-keeping & skin-nurturing
functions. There
are many hydrophilic gene located at the surface of stereo molecular
structure of silk peptide, which confirmed that the silk peptide
is the natural moisture adjusting factor which has the excellent
moisture-keeping function. There are testing indicated that under
the conditions of 27℃
(of temperature), 86% RH (of relative humidity) and 12 hours (of
hygroscopic time), the hygroscopic rate of 2.5% density of silk peptide liquid is equivalent to the one of
48% density of glycerol. Other testing indicate that since the silk
peptide has the strongest permeability, it will permeate to the
skin cuticle to play the moisture-keeping function after it being
smeared on the skin for about ten seconds, because the little molecular
silk peptide after passing through the skin cuticle, is linked with
the skin epithelial cell, and is absorbed by it as the nurture materials
to join and to promote the cell’s
metabolism, so as to give the skin gloss, nutriment, softness &
elasticity. (see Table 3,4.)
Table 1. Different effects of skin beauty
sample
|
gloss
|
nutriment
|
softness
|
wrinkle
|
silk
cream*
|
99.11%
|
99.82%
|
96.36%
|
50.24%
|
check test
|
71.66%
|
70.69%
|
70.69%
|
26.19%
|
*
samples containing silk peptide or silk powder.
Table
2. Effects of curing
different dermatosis
sample
|
phagas
|
seborrhea
|
pityriasis
|
pruritus
|
chloasma
|
silk
cream
|
97.14%
|
83.51%
|
94.34%
|
98.04%
|
56.25%
|
check
test
|
37.50%
|
44.44%
|
66.67%
|
50.00%
|
33.44%
|
Note:
The above mentioned data in table 3 & 4 are the united clinic
testing results collected by Beijing Medical University, Beijing
Friendship Hospital, the General Hospital of PLA & the other six
Beijing universities & hospitals.
(2)
Controlling the growing of skin melanin.
Melanin is the micro granular material which is produced by the
tyrosine of skin melanocyte under the oxidation of tyrosinase. The
experiment indicates that the silk peptide of molecular weight in
300-2000, which its density in 50%, 20% or 10% separately, the
controlling rate for the grown melanin is 83.7%, 70.9% and 50.9%
correspondently. The further testings indicate that comparing with
the silk peptide in large molecular, the small molecular have the
best results in controlling the growing of melanin.
(3)
Promoting
the regeneralting of skin tissue & preventing the skin chap or
the chemical injury. The silk peptide is
more effective for promoting the wound-healing of skin. When cutting
a wound at each side of a rabbit backbone & smearing the silk
peptide or normal saline on it separately, the results indicate that
the silk peptide is without any stimulation and can quicken the
woundhealing. Therefore, the cosmetics of silk peptide has the
better effects to prevent the skin chap, as well as to reduce the
skin wrinkled or to prevent the skin being injured by dust, paint,
acid, alkali or other chemical materials.
(4)The excellent hair-protection function.
The hair-protection function of silk peptide depends on the
characters of absorptivity, adsorptivity, film formation &
moisture-adjusting-keeping ability.
Absorptivity
& Adsorptivity: A
series of experiments indicate that comparing with the other protein
hydrolysate, (such as collagen, ossein and glutin etc), the obvious
characteristic of silk peptide is easy to be absorbed by hair. The
radiotracer technology also indicates that the absorption of silk
peptide by skin or hair is mainly rely on its increased, the
absorptivity of hair to the silk peptide is also increased. For the
injured hair, its absorptivity & adsorptivity to the silk
peptide in low molecular weight is above the average, as well as the
function of hair-repairing & protecting from the silk peptide is
more obvious accordingly.
Film-Formation:
The silk peptide of molecular weight in 1000-2000 have a good film
formation character on hair because of its special gloss, as well as
its good hand feeling and elasticity of hair. The X-ray diffraction
method indicated that the film formed by silk peptide on hair is the
groupβcrystal, which is not easy to be washed away by water.
This is the important evidence of hair-protection by silk peptide.
The experiment also demonstrated that a certain strength of the film
on the hair can be used as the hair-forming agent, which can keep
the hair fashion in good state for a little bit longer under 80% RH
of moisture condition comparing with PVP, collagenous peptide and
starch aqueous solution.
Moisture-Adjusting
& Keeping Function: Similar
to skin, the healthy hair should keep a certain amount of water,
otherwise it might be dry, forked or easy to be broken off and lost.
The film formed by silk peptide on the hair surface can prevent the
excess evaporation of moisture, and can regulate the humidity of the
little space of hair surface as a natural moisture-adjusting factor,
to let the hair soft and smooth.
To
sum up the above mentioned, the silk peptide have the functions of
hair-nurturing, protecting and beautifying, which have superiority
over common synthetic materials to its effectiveness and security.
(5)The silk peptide have the best dissolvability with water, ethanol
in 40% density, PVP, PVA & the systems of anionic, cationic,
nonionic and amphoteric surfactants. After smearing the silk cream
which containing the silk peptide on skin, following clinic testing
results can be acquired (see table 3 & 4).
Table
3. Physicochemical, Hygienic & Others Indexes of Silk Peptide
Item
|
Silk
Peptide Powder
|
exterior
|
light
yellow powder
|
dissolvability
|
dissolved
in water and< 40% ethanol
|
total
N %(W/W)
|
≥13.0
|
drying
shrinkage %(W/W)
|
≤5.0
|
pH
value
|
4.0-7.0
|
Hg
mg/kg
|
≤1
|
Asmg/kg
|
≤5
|
Pbmg/kg
|
≤20
|
aerobic
bacterial count, num/g
|
≤100
|
fecal
coliforms, num/g
|
nondetactable
|
pseudomonas
aeruginosa
|
nondetactable
|
staphylococcus
aureus
|
nondetactable
|
Package:
This product is packed in the aluminium-plastic compound bag in
vacuum condition 200gr. It should be kept in cold, dry
& no direct light place for two years' period of quality
guarantee.
|