Silk protein is the main component of silk. It is an important protein fiber whose chemical components mainly include silk fibroin and collagen. Silk fibroin accounts for about 75% of the total weight of silk protein. It is composed of a polypeptide called silk fibroin and has excellent softness and gloss. Collagen is another important component of silk protein, accounting for about 25%. Its structure is similar to collagen in animal tissues, giving silk good toughness and firmness.
From a structural point of view, the characteristics of silk protein mainly include the following aspects:
High strength: Silk protein fiber has high tensile strength, which is stronger than steel of the same diameter.
Soft gloss: It has a soft, smooth feel and beautiful luster, making it an ideal raw material for high-end textiles.
Moisture absorption and breathability: It has good moisture absorption and breathability, which can keep the skin dry and comfortable.
Biocompatibility: It is non-irritating to the skin, has good biocompatibility, and is suitable for use in fields such as medical health products and cosmetics.
The preparation methods of silk protein mainly include traditional extraction methods and modern biotechnology methods.
Traditional extraction methods:
Traditional silk protein extraction methods usually include the following steps:
Silkworm cocoon boiling: First, put the silkworm cocoon into boiling water and boil it to separate the silk protein from the cocoon shell. This step usually requires special processes and equipment to ensure that the silk protein is not damaged.
Silk spinning: After digestion, the silk protein is spun into silk threads to form the original silk yarn.
Degumming: The silk undergoes a certain degumming process to remove impurities and gum components.
Other processing: The degummed silk can be subjected to subsequent dyeing, weaving and other processing to finally form the finished product.
Modern biotechnological methods:
With the development of biotechnology, modern silk protein preparation methods have also been innovated, mainly including the following methods:
Genetic engineering method: Through genetic engineering technology, silk protein genes are introduced into other organisms, such as Escherichia coli, yeast, etc., and these microorganisms are used to express and synthesize silk proteins, and then extracted and purified.
Biological fermentation method: Use yeast, fungi and other microorganisms to ferment to produce silk protein. Through the control and optimization of fermentation conditions, the yield and purity can be improved.
Cell culture method: Using in vitro cell culture technology, silk protein genes are introduced into mammalian cells or insect cells for large-scale silk protein production.
These modern biotechnology methods have certain advantages in preparing silk proteins, such as high production efficiency, high purity, and strong controllability. They also avoid the boiling and degumming process of silkworm cocoons in traditional methods, reducing environmental impact. Impact. With the continuous advancement of biotechnology, these methods also provide more possibilities and development space for the production of silk protein.
Hydrolyzed silk protein refers to the hydrolysis reaction of silk protein molecules under the action of water to form smaller peptides and amino acids. The principle of hydrolyzing silk protein is to use hydrolase or chemical methods to break the peptide bonds in the silk protein molecules, reducing its molecular weight and increasing its solubility and bioavailability. Hydrolyzed silk protein is more easily absorbed and utilized by the human body and has better bioavailability and functionality.
The basic process of hydrolysis reaction:
The hydrolysis reaction is to hydrolyze silk protein under certain conditions through hydrolase or chemical reagents. The process includes:
Cleavage of peptide bonds: Under the action of hydrolase or chemical reagents, the peptide bonds within the silk protein molecule are broken.
Produce peptides and amino acids: After hydrolysis, the fibroin molecules are broken down into smaller peptides and free amino acids.
Control reaction conditions: Control reaction conditions, such as temperature, pH value, etc., to ensure that the hydrolysis reaction proceeds smoothly.
The principle and function of hydrolyzed silk protein:
The principle of hydrolyzed silk protein is to reduce the molecular weight of silk protein through hydrolysis reaction, enhance its solubility and bioavailability, and make it have better nutritional value and functionality. Hydrolyzed fibroin generally has better bioavailability, antioxidant and antibacterial properties.
Production process of hydrolyzed silk protein:
The production process of hydrolyzed silk protein usually includes the following steps:
Raw material preparation: Select high-quality silk protein raw materials for pretreatment to remove impurities.
Hydrolysis reaction: Use hydrolase or chemical reagents to hydrolyze silk protein, and control the reaction conditions and time.
Processing: Process the hydrolyzed product, such as filtration, concentration, drying, etc.
Product packaging: Packaging, storage and transportation of hydrolyzed silk protein products.
Common hydrolysis methods and processes:
Common hydrolysis methods include enzymatic hydrolysis, acid-base hydrolysis, enzyme-acid combined method, etc. The technological process includes raw material processing, hydrolysis reaction, product processing and packaging.
Control of hydrolysis reaction conditions:
Control parameters such as temperature, pH value, enzyme activity or reagent concentration of the hydrolysis reaction to ensure efficient progress of the hydrolysis reaction.
Improved product purity and activity:
By optimizing the hydrolysis conditions and process flow, the purity and activity of hydrolyzed silk protein products can be improved, such as selecting appropriate enzymes, controlling reaction time, etc.
Quality standards and testing of hydrolyzed silk protein:
The quality index requirements for hydrolyzed silk protein products include protein content, amino acid composition, peptide length distribution, solubility, etc. Common detection methods include UV spectroscopy, high performance liquid chromatography, amino acid analysis, etc.
In general, the production and process of hydrolyzed silk protein require strict control of hydrolysis reaction conditions, optimization of process flow, and comprehensive quality testing of the product to ensure the quality and functional performance of the product.
Market size and growth trends:
The global hydrolyzed silk protein market continues to expand and is expected to maintain a good growth trend in the next few years. As people's demand for functional and natural raw materials increases, the application prospects of hydrolyzed silk protein as a high-quality protein resource are very optimistic.
Application of hydrolyzed silk protein in textiles:
In the field of textiles, hydrolyzed silk protein is used to produce functional textiles, such as antibacterial, antistatic, moisture permeable, warm and other properties. It can be blended with fibers or coated on fiber surfaces to improve the comfort and functionality of textiles. Its applications include sportswear, underwear, home textiles, etc.
Development trends of functional textiles:
In the future, functional textiles will become the focus of development in the textile industry. Consumer demand for textiles with antibacterial, antistatic, moisture wicking and other functions is increasing, which will promote the wider application of hydrolyzed silk protein in the textile field.
Applications of hydrolyzed silk protein in the fields of medical and health products, cosmetics, food and beverages:
In the fields of medicine and health products, cosmetics, food and beverages, hydrolyzed silk protein also has important application value. Due to its good biological activity and functionality, hydrolyzed silk protein is widely used in health products and cosmetics such as anti-aging, skin moisturizing, and nutritional supplements. In the field of food and beverages, hydrolyzed silk protein can also be used to enhance nutritional value and improve taste.
Demand and application cases for hydrolyzed silk protein in various fields:
In the field of medicine and health products, hydrolyzed silk protein is used to produce anti-aging products, protein nutritional supplements, etc.; in the field of cosmetics, it is used in moisturizing creams, facial masks and other products; in the field of food and beverages, it can be used in functional drinks , nutritional food and other products. These application cases show that hydrolyzed silk protein has broad market demand and application prospects in multiple fields.
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