Overview
Casein is a group of phosphoproteins that make up the majority of proteins found in cow's milk, accounting for approximately 80% of its total protein content. It is extracted through acid precipitation or enzymatic methods, resulting in a high-protein powder. Casein is valued for its nutritional profile, containing all essential amino acids, and its functional properties, such as emulsification and binding. Historically, casein has been used for centuries in cheese-making and other dairy products. Today, its applications extend beyond food to industrial uses like adhesives, paints, and even plastics due to its biodegradable nature and binding capabilities.
Physical and Chemical Properties
Casein is a white to off-white powder with a density of approximately 1.25-1.31 g/cm³. It is insoluble in water but dissolves in alkaline solutions, forming a colloidal suspension. The protein complex decomposes upon heating rather than melting, making it thermally unstable at high temperatures. Chemically, casein is composed of several subtypes (α-, β-, and κ-casein), each contributing to its functional properties. Its high phosphorus content gives it excellent emulsifying and water-binding capabilities, which are critical in food and industrial applications.
Main Applications
In the food industry, casein is a key ingredient in cheese production, protein supplements, and infant formula due to its slow digestion rate and high nutritional value. It is also used as a stabilizer and thickener in processed foods. Beyond food, casein is utilized in adhesives for woodworking and labels, where its strong binding properties are advantageous. In paints, it acts as a natural binder, and in pharmaceuticals, it serves as a coating material for tablets. Its biodegradability makes it an attractive option for eco-friendly products.
Safety and Storage
Casein is generally recognized as safe (GRAS) for consumption but may trigger allergic reactions in individuals with milk protein allergies. Industrial-grade casein should be handled with standard safety precautions, including dust masks to avoid inhalation. Storage requires a cool, dry environment away from moisture and direct sunlight to prevent clumping or degradation. Proper sealing is essential to maintain quality, especially for food-grade products. Industrial users should also ensure compliance with local regulations for handling and disposal.
B2B Procurement Guide
When procuring casein, B2B buyers should prioritize suppliers that provide certificates of analysis (CoA) to verify purity, protein content, and absence of contaminants. Food-grade casein must meet stringent regulatory standards, such as those set by the FDA or EU. Pricing varies based on purity, origin (bovine vs. non-bovine), and volume. Bulk purchases typically offer cost savings. Buyers should also consider logistical factors, such as shelf life and storage requirements, to avoid spoilage or quality degradation during transit.
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