Overview of sericin Powder
As early as the 1960s, there is a certain amount of silk in the cosmetics added to the fine powder of the "silk cream" products, silk cream on skin care, beauty has a certain effect, the product is still on the market.
In the early 80's in Japan first appeared the second generation of cosmetics containing silk - silk peptide, this kind of cosmetic is added to the silk hydrolysis products, its average molecular mass of 500 ~ 10,000 D, for the water-soluble silk polycondensate, silk peptide's molecular structure is a helical type, with a special ultramicrostructure and multilevel structure, the structure of these make It has excellent oxygen permeability and moisturizing performance.
sericin powder is a kind of natural moisturizing factor substance, which is made from selected mulberry silk as raw material and refined by modern biochemical technology, and it has such excellent properties as soluble in water, high purity, fine and uniform particle size, good appearance and color.
sericin comes from the outer layer of cocoon silk collagen, the use of its safety is absolutely guaranteed. sericin is in the cocoon silk outer layer wrapped in the silk pigment periphery of the silk protein, sericin for the globular proteins, the decolourization of silk solution through the decolorization, enzyme digestion, ion exchange purification, concentration, spray drying and other processes, can be made of high purity soluble silk glue powder. Silk gum powder has excellent properties such as good water solubility, fine and uniform particle size, good appearance and color.
sericin contains 18 kinds of amino acids, of which the content of essential amino acids reaches more than 18%, the molecular conformation of soluble sericin is dominated by the structure of random curls, and the aggregated structure of its polymer is mainly amorphous structure, which is a kind of natural moisturizing factor substance, which can effectively prevent the skin from drying and wrinkling and aging, and inhibit the generation of melanin in the skin. At the same time, it has antioxidant function to resist the erosion of the skin by ultraviolet rays, sunlight, microwave, chemical substances and atmospheric pollutants. So silk powder has been widely used in all kinds of high-grade cosmetics. sericin powder added to cosmetics can play a unique effect of moisturizing, whitening, antioxidant trinity, doubly people's attention.
Preparation
Cocoon silk as raw material, with pure water to wash the cocoon coat 3-4 times, and then pure water at 98 -100 ℃ cocoon coat degumming, and then the sericin liquid with activated charcoal decolorization, protease degradation, ion exchange purification, vacuum thin film concentration, spray-drying to get the finished product.
Amino acid composition
Silk fiber and human skin, hair keratin structure has a lot of similarities, silk fabric is known as the "third skin". 20 century at home and abroad in the middle of the best-selling silk cream (which added silk fine powder), this silk cream has a certain skin care effect, but its shortcomings is that the silk fine powder for the insoluble silk pigment Fiber protein, to be absorbed by the skin is more difficult. In addition, the silk pigment cream in the silk pigment powder is treated with concentrated alkali, making the original amino acid composition of the silk pigment has changed, while losing the original luster of the silk fiber. And soluble silk powder preparation process reaction conditions are mild, there are no such disadvantages.
Silk gum contains more than 10 kinds of amino acids, of which almost all the essential amino acids, its content accounts for about 16.5% of the total amino acids, much higher than the silk pigment. Silk is a globular water-soluble protein, very easy to be absorbed by the skin, especially serine, aspartic acid, glutamic acid, lysine and arginine are the nutritional elements of the skin, these nutritional elements can be absorbed through the epidermal cell gap and glands, thus enriching the skin's nutrition, enhance the vitality of the skin cells and elasticity, promote the metabolism of the epidermal cells, so the long-term use of cosmetics to add the silk gum can be used for the Therefore, the long-term use of cosmetics with silk gum can provide the necessary nutrients for skin beauty.
Efficacy
1. Moisturizing and moisture absorption
Skin stratum corneum can make the skin plump and rich in elasticity when it maintains 10%-20% water, when the water in the stratum corneum is lower than 10%, the skin will be dry or even cracked, the reason why the skin stratum corneum contains a certain amount of water, on the one hand, due to the sebaceous membrane can prevent evaporation, on the other hand, there is Natural Moisturizing Factor (Natural MoisturizingFactor, NMF) in stratum corneum, which plays an important role in skin moisturizing. On the other hand, the stratum corneum contains Natural Moisturizing Factor (NMF), which plays an important role in skin moisturizing and keeps the water content in the skin in the right amount, thus making the skin elastic, smooth and soft.
However, due to changes in the external environment, the NMF contained in the skin alone cannot play a role in moisturizing the skin, and when it is necessary to supplement the NMF in the stratum corneum of the skin from the outside world, the composition of the NMF in the stratum corneum of the skin has been determined by Striance et al. and it is made up of amino acids, pyrrolidone carboxylic acid, lactate, urea, sugars, organic acids and peptides, etc., and the silk gelatin protein, which is in the outer layer of the silk, is an ideal natural moisturizing factor. Silk protein, which is the outer layer of silk, is an ideal natural moisturizing factor, which is mainly due to the fact that the amino acid composition of silk gel is very close to that of NMF in the skin. In addition, many polar groups on the polypeptide chain of silk glue are on the surface, which can make the body water transported to the skin stratum corneum and combined, so that the skin maintains a certain amount of moisture.
The reason why silk glue has excellent moisturizing, moisture absorption function, is determined by the silk glue molecular structure. The molecular conformation of silk gum is a random curled structure, and its polypeptide chain is loose and disordered, so that many hydrophilic groups on the polypeptide chain are on the surface of the spatial structure of the molecule, and these hydrophilic groups can make the human body water transfer to the epidermal stratum corneum and combined to maintain the appropriate moisture content in the skin, so that the skin is elastic, smooth and soft. Glycerin also has good hygroscopic properties, but when the dosage is too much when the skin pores are easily clogged, the silk gum is completely free of such disadvantages.
2. Inhibit skin melanin production
Human skin whitening and the formation of melanocytes in the cortex, and melanocytes can produce melanin to make the skin black, melanin formation mechanism in the skin is due to the melanocytes contain tyrosinase, which can make the skin of the keratin component of tyrosine oxidation to melanin, and ultraviolet light can promote this oxidation reaction, so the skin in summer is often exposed to the sun is easy to become black. This is because the hydroxyl amino acids (serine, threonine) and trace elements (copper, iron, etc.) complex, affecting the normal play of tyrosinase activity, thereby effectively inhibiting the formation of melanin, so the addition of an appropriate amount of silk gum in the skin care cosmetics can keep the skin white.
3. Protection and repair of hair
The chemical nature of hair protein is not active, more stable, but more sensitive to heat, acid, alkali and chemicals (such as chemical perming essence), although the use of cold perming essence in the process of hairdressing, but it will still cause different degrees of damage to the hair. In addition, the main ingredient of the commonly used perm agent is ammonium thioglycolate, after the hair is treated by the perm agent, the double sulfhydryl bond in the keratin of the hair is destroyed, and under the action of alkali and hot air, after a short period of time (1 ~ 2 min), the double sulfhydryl bond in the keratin can be re-bonded, forcing changes in the arrangement of the hair cells to create curls and all kinds of beautiful and colorful hairstyles. However, the elasticity and strength of the hair as well as the water retention will be greatly reduced after the use of perming agents, resulting in hair dryness and increased split ends, which will lead to a deterioration of hair luster.
Silk protein and hair keratin protein structure is very similar, so the silk glue and hair have good affinity, silk glue on the hair adsorption is also larger, from the table below can be seen when the hair impregnated and adsorption of silk glue solution, hair elasticity and strength will increase.
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