Overview
Edible casein is a milk-derived protein obtained through acid precipitation or enzymatic coagulation of skim milk. As a complete protein containing all essential amino acids, it serves as a valuable nutritional ingredient and functional food additive. The industrial production process typically involves milk pasteurization, precipitation, washing, drying and milling to create a fine powder. Casein represents about 80% of milk proteins and has been used for centuries in various forms. Modern food-grade casein production adheres to strict quality standards to ensure safety and consistency for human consumption. Its unique properties make it indispensable in many food and industrial applications.
Physical and Chemical Properties
Edible casein appears as a white to slightly yellow powder with minimal odor. Its insolubility in water is a defining characteristic, though it becomes soluble in alkaline solutions above pH 6.5. The protein consists of several subtypes (αs1, αs2, β, and κ-caseins) that contribute to its functional behavior. Technically classified as a phosphoprotein, casein contains phosphate groups that enhance its ability to bind calcium and minerals. Its isoelectric point is around pH 4.6, which is utilized in the precipitation process during manufacturing. The protein exhibits excellent thermal stability compared to other milk proteins like whey.
Main Applications
In food production, edible casein serves multiple functions: as a protein fortifier in nutritional products, an emulsifier in processed cheeses, and a texture modifier in baked goods. It's particularly valued in sports nutrition products due to its slow digestion rate and sustained amino acid release. Beyond food, casein finds use in technical applications including adhesives, paper coatings, and textile finishing. Pharmaceutical grade casein is employed in tablet formulations and medical nutrition products. The binding properties make it useful in water-based paints and cosmetic formulations as well.
Safety and Storage
While generally safe for consumption, casein may trigger allergic reactions in individuals with milk protein allergies. Proper handling requires protection from moisture absorption, as humidity can cause caking and microbial growth. Bulk storage should maintain relative humidity below 65%. Quality edible casein should meet microbiological specifications for food use, typically with total plate count <50,000 CFU/g and absence of pathogens. Suppliers should provide certificates of analysis confirming compliance with food safety standards such as FCC or EU regulations. Shelf life is typically 12-24 months when stored properly.
B2B Procurement Guide
When sourcing edible casein, buyers should verify several key parameters: protein content (minimum 90% on dry basis), milk origin (preferably from regions with strict dairy controls), and processing method (acid vs. rennet casein have different functional properties). Reputable suppliers should provide documentation including allergen statements, heavy metal testing results, and pesticide residue analysis. Bulk shipments require moisture-proof packaging, typically 25kg multi-wall bags with polyethylene liners. Price negotiations should consider protein content, microbiological quality, and purchase volume.
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