Overview
Silk sericin is a globular protein constituting 20-30% of raw silk's total weight, primarily extracted from Bombyx mori cocoons during the degumming process. This natural biopolymer has gained significant industrial attention due to its unique biochemical properties and sustainability profile. Unlike fibroin (silk's structural protein), sericin acts as an adhesive layer binding silk fibers. Modern extraction techniques preserve its bioactive properties, making it valuable for high-value applications in cosmetics, medicine, and functional textiles. The protein contains 18 amino acids, with serine (30%), aspartic acid, and glycine being predominant.
Physical and Chemical Properties
Sericin demonstrates remarkable thermal stability, maintaining structure up to 120°C, with variable molecular weight depending on extraction methods. Its isoelectric point ranges between pH 3.8-4.5, influencing solubility characteristics. The protein exhibits unique rheological properties - aqueous solutions show pseudoplastic behavior at concentrations above 5%. Its moisture retention capacity exceeds 60% relative humidity absorption, outperforming many synthetic humectants. Sericin's UV absorption peaks at 275-280 nm due to tyrosine and tryptophan residues, providing natural UV-blocking functionality.
Main Applications
In cosmetics, sericin serves as a bioactive moisturizer in creams (0.5-5% concentration), hair conditioners, and anti-aging formulations due to its collagen-stimulating effects. Biomedical applications include wound dressings (enhancing epithelialization), drug delivery systems (as biodegradable matrix), and tissue engineering scaffolds. The food industry utilizes sericin as a natural preservative and nutritional supplement (rich in essential amino acids). Textile manufacturers incorporate it for creating antimicrobial fabrics and improving dye affinity. Emerging applications include biodegradable packaging films and electronic device substrates.
Safety and Storage
Sericin demonstrates excellent biocompatibility with LD50 >5,000 mg/kg (oral, rats). However, residual degumming chemicals (e.g., Na2CO3) in low-grade products may cause irritation. Cosmetic-grade material should meet ISO 10993 biological evaluation standards. Proper storage requires airtight containers with desiccants to prevent hydrolysis. Lyophilized powder maintains stability for 2+ years at 4°C, while liquid formulations require preservatives (e.g., 0.1% phenoxyethanol) and refrigeration. Industrial users should conduct patch tests for potential allergic reactions, particularly in leave-on skincare products.
B2B Procurement Guide
Commercial buyers should specify: 1) Extraction method (enzymatic yields higher molecular weight fractions), 2) Purity level (cosmetic-grade ≥95%), 3) Microbial limits (<100 CFU/g), and 4) Heavy metal content (<10 ppm). Leading producers are concentrated in China (70% global output), Japan, and India. MOQ typically starts at 25kg for powder formulations. Third-party certifications to request include Halal, Kosher, and ECOCERT for organic claims. Sample evaluation should assess solubility, odor, and color consistency across batches.
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