Overview
Calcium caseinate is a milk protein derivative produced by precipitating casein from skim milk and treating it with calcium hydroxide. Unlike sodium caseinate, it contains bound calcium, enhancing its nutritional profile. It is valued for its high protein bioavailability, neutral taste, and functional properties like emulsification and water-binding. As a slow-digesting protein, calcium caseinate is favored in sustained-release formulations, particularly in medical and sports nutrition. Its production involves acid precipitation or enzymatic methods, with the latter preserving more native protein structures for superior functionality.
Physical and Chemical Properties
Calcium caseinate is a white, odorless powder with a slight milky taste. Its solubility varies with pH, dispersing best in alkaline conditions (pH ≥6.5). The calcium content typically ranges from 1.5–2.5%, contributing to its heat stability (up to 140°C). Structurally, it forms micelles in solution, enabling fat encapsulation—a key trait for creamy textures in processed foods. Unlike whey proteins, it coagulates under heat but resists precipitation in acidic environments, making it ideal for coffee creamers and acidic beverages.
Main Applications
In the food industry, calcium caseinate acts as a binder in sausages, a foaming agent in whipped toppings, and a stabilizer in dairy alternatives. Its slow absorption also makes it a staple in night-time protein supplements. Pharmaceuticals utilize it as a excipient for tablet coatings and controlled-release matrices. Recent innovations include micellar casein for anti-catabolic medical nutrition, targeting muscle-wasting conditions like sarcopenia.
Safety and Storage
While generally safe, calcium caseinate may trigger allergic reactions in individuals with milk protein intolerance. Industrial handling requires dust control to prevent inhalation risks. Storage in moisture-proof containers is critical to prevent caking or microbial growth. Regulatory compliance varies by region: FDA approves it under 21 CFR 184.1217, while EU standards (EC No 1333/2008) mandate allergen labeling. Shelf life is typically 24 months when stored below 25°C at <65% humidity.
B2B Procurement Guide
Bulk buyers should prioritize suppliers with ISO 22000 or FSSC 22000 certifications. Key specifications include protein content (≥90% dry basis), calcium levels (1.5–2.5%), and low thermophilic spore counts (<1,000 CFU/g). For niche markets like organic or clean-label products, verify non-GMO status and absence of synthetic processing aids. Sea freight shipments require desiccant packs to prevent moisture damage. Sample testing for solubility (90%+ in 10°C water) and emulsification capacity (≥50% oil retention) is recommended.
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