Casein[2]
Overview
Casein is the primary protein component in cow's milk, accounting for about 80% of milk's total protein content. It exists as a colloidal suspension in milk, bound with calcium phosphate in structures called micelles. Commercially, it's extracted through acid precipitation or enzymatic methods (rennet casein). Industrial production typically involves skimmed milk that undergoes precipitation, washing, drying, and milling processes. Casein's unique properties make it valuable across multiple industries, from food manufacturing to technical applications like adhesives and coatings. Its amino acid profile and functional characteristics differ significantly from whey proteins.
Physical and Chemical Properties
Casein is a heterogeneous mixture of several phosphoproteins (αs1, αs2, β, and κ-caseins) with molecular weights ranging from 19,000 to 25,000 Daltons. It's amphiphilic, containing both hydrophilic and hydrophobic regions, which explains its excellent emulsification properties. The isoelectric point is around pH 4.6, where it becomes least soluble. Unlike many proteins, casein has a random coil structure rather than a defined tertiary structure, making it heat-stable but susceptible to precipitation by acids or specific enzymes. Its calcium-binding capacity through phosphate groups is crucial for micelle formation in milk. Technical-grade casein typically has 85-95% protein content, with the remainder being minerals (ash), moisture, and small amounts of lactose.
Main Applications
In the food industry, casein serves as a nutritional supplement, cheese analog ingredient, and texture modifier in products like coffee whiteners and processed meats. Its excellent film-forming properties are utilized in edible coatings for fruits and pharmaceutical tablets. Caseinates (soluble forms) are common in nutritional shakes and sports supplements. Industrial applications leverage casein's adhesive qualities in wood glues and paper coatings. It's also used in water-based paints as a binder, in cosmetics for its emulsifying properties, and in textile sizing. Technical-grade casein finds use in specialty applications like photographic paper coatings and biodegradable plastics.
Safety and Storage
While generally recognized as safe (GRAS) for food use, casein can trigger allergic reactions in milk-allergic individuals. Industrial-grade casein may contain processing residues requiring proper handling with dust masks and eye protection to prevent inhalation or contact irritation. Storage requires protection from moisture (relative humidity below 65%) and temperatures below 25°C to prevent caking or microbial growth. Bulk packaging typically uses multi-layer paper bags with polyethylene liners or food-grade containers. Shelf life is typically 12-24 months when stored properly, with quality indicators including color stability and absence of off-odors.
B2B Procurement Guide
When sourcing casein, specify required parameters including protein content (typically 85-95%), ash content (below 4% for food grade), acidity, microbiological standards, and particle size. Food-grade casein requires additional certifications like Halal, Kosher, or organic status if needed. Quality verification should include solubility tests in alkaline solutions and viscosity measurements for technical applications. For large orders, request certificates of analysis and consider third-party testing for heavy metals or contaminants. Lead times vary from 2-8 weeks depending on source and customization requirements. Chinese domestic casein often offers competitive pricing but verify consistency in quality across batches.
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