Overview
Sodium caseinate is a protein derivative obtained by treating casein (the primary protein in milk) with sodium hydroxide. It is widely valued for its emulsifying, stabilizing, and water-binding properties in food and industrial applications. As a byproduct of dairy processing, it is often sourced from skim milk. In B2B contexts, sodium caseinate is traded as a powder or granules, with specifications varying by protein content, solubility, and viscosity. Its versatility makes it a staple in sectors ranging from food manufacturing to technical adhesives.
Physical and Chemical Properties
Sodium caseinate is a high-molecular-weight polymer with amphiphilic properties, enabling it to stabilize emulsions by reducing surface tension between oil and water phases. It dissolves readily in water, forming viscous, opalescent solutions. Unlike casein, it is not precipitated by acid. The protein’s thermal stability allows it to withstand moderate heat during processing, though excessive temperatures can cause denaturation. Its isoelectric point (pH 4.6) is higher than that of casein due to the introduction of sodium ions, enhancing solubility in neutral and alkaline conditions.
Main Applications
In the food industry, sodium caseinate is a key ingredient in coffee creamers, processed cheeses, and meat products, where it improves texture and moisture retention. It also serves as a protein supplement in sports nutrition and clinical diets. Non-food uses include adhesives for paper labeling, coatings for photographic films, and biodegradable plastics. Its binding properties make it suitable for pharmaceutical tablets and cosmetic formulations. Recently, upcycled or expired sodium caseinate has been explored for animal feed or fermentation substrates.
Safety and Storage
While sodium caseinate is non-toxic and GRAS-certified, improper storage can degrade its quality. Exposure to humidity may cause caking, and prolonged heat can reduce solubility. Bulk containers should be sealed and stored below 25°C. Expired sodium caseinate should be assessed for microbial contamination or rancidity before repurposing. Industrial recycling often involves sterilization or blending with fresh batches to meet safety standards for non-food applications like adhesives.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO or FSSC 22000 certification to ensure compliance with food safety regulations. Key specifications to verify include protein content (≥90%), ash content (≤6%), and microbiological limits (e.g., <10,000 CFU/g). For expired stock, negotiate discounts but confirm usability through lab tests. Spot purchases typically range from 1-25 metric tons, with prices lower for industrial-grade material. Consider regional dairy processing hubs like Europe or New Zealand for cost-effective sourcing.
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