Casein
Casein is the main milk protein in cow’s milk, present in micellar form and accounting for around 80% of total milk proteins. In industrial use, casein is most often a white to cream-colored powder, with neutral to slightly milky taste and poor water solubility without prior processing (dispersing, alkalization). It has high nutritional value, a complete amino acid profile and excellent functional properties in terms of gelling, water binding and structure formation. It is used as a high-protein, functional dairy raw material and as the base for caseinate production.
Source
Casein is obtained from cow’s milk by coagulating casein micelles:
- by acidification – lowering milk pH with lactic or other food-grade acid (acid casein),
- by enzymatic action – using rennet to cleave kappa-casein and induce coagulation (rennet casein).
After coagulation, whey is removed, followed by washing, pressing and drying, resulting in casein granules or powder. The final product has high protein content (typically 88–92% on dry basis), low fat and low lactose, making it suitable for formulations with controlled sugar and fat levels.
Variations
Industrial casein is commonly categorized as:
- acid casein – produced by milk acidification, widely used for caseinate production and technical applications,
- rennet (rennet-curd) casein – produced by rennet coagulation, used in specific dairy protein and cheese-related formulations,
- edible and technical casein – according to purity level, microbiological quality and suitability for food or non-food applications.
Differences in production route affect solubility, gel structure and functional behavior in final applications.
Applications In The Food Industry
Dairy Industry
In the dairy industry, casein is used for:
- standardizing protein content in cheese making and recombined dairy products,
- manufacturing caseinates that are further used in dairy beverages, processed cheeses and desserts,
- formulating high-protein dairy products and nutritionally enriched drinks.
Its presence enables better control over structure, ripening and texture in various cheese types and dairy specialties.
Meat Industry
In the meat industry, casein (or casein-based milk proteins) is used in:
- emulsion-type sausages, pâtés and spreads as an additional protein source,
- products where casein is later converted into caseinates to improve water and fat binding,
- formulations where “milk protein” declaration is desired as a functional and nutritional component.
This contributes to better structure, higher yield and improved sensory quality of finished meat products.
Savory Foods And Ready Meals Industry
In soups, sauces and ready meals, casein is used:
- as the main milk protein for developing dairy-based cream soups and sauces,
- in dehydrated mixes where it is further functionalized in the final system (often combined with caseinates),
- for nutritional enrichment of products requiring higher levels of quality protein.
As a concentrated source of complete protein, casein enables products with enhanced protein claims.
Confectionery Industry
In confectionery, casein is used:
- as a milk protein component in selected caramels, fillings and protein-enriched sweets,
- in specialized protein bars and desserts where it is combined with whey proteins,
- in recipes requiring slower protein release and stable structural properties.
Its ability to form firm gel structures and deliver high protein content makes it suitable for nutritionally focused confectionery products.
Benefits Of Use
Casein provides:
- high levels of complete, nutritionally valuable milk protein
- an excellent base for producing functional caseinates and dairy protein systems
- precise control of structure, firmness and gel formation in cheese, meat and sauce applications
- low lactose and fat content, suitable for formulations with controlled sugar and calorie levels
- good storage stability in dry form and easy incorporation into dry blends.
These features make casein a key dairy protein raw material and the starting point for a wide range of functional ingredients in dairy, meat, confectionery and savory foods industries.
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