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Caseinates: Which type to choose?
Production process
Caseinates are a family of ingredients – of significant interest in the food industry – obtained from “casein,” the main protein in milk, which is present in milk at levels close to 2.5%. The production process for caseinates shares several steps with cheese production and takes advantage of the tendency of milk caseins to coagulate when subjected to specific operational conditions. This process involves the conversion of casein into “acid casein” through the acidification of milk, which can be achieved through the use of mineral acids. The resulting acid casein can then undergo an optional drying phase to produce dry acid casein, which can be powdered and stored.
Caseinates can be defined as chemical compounds formed by the association of casein (acid) with metal ions such as monovalent sodium or divalent calcium. They appear as a free-flowing white-cream powder and represent the soluble form of casein, from which they are produced by reaction with diluted alkaline solutions (or “bases”). Depending on the type of alkaline substance used, different types of caseinate can be obtained, such as Sodium Caseinate (produced with sodium hydroxide), Calcium Caseinate (produced with calcium hydroxide), or Potassium Caseinate, if casein is treated with potassium hydroxide.
The drying step can be carried out using different methods, with the most common being the characteristic spray-drying and extrusion techniques.
Characteristics and applications
Caseinates represent a type of ingredient of great interest to the food industry, especially from a technological perspective, due to the numerous functions they can perform within food systems: emulsifying, thickening, water retention, aerating/whipping, binding, adhesive, and even chelating and whitening. Due to these characteristics, they can be used in a wide range of applications.
The aerating, whipping, and whitening properties of caseinates make them an ideal functional component in the preparation of milkshakes, smoothies, and other flavored beverages, such as chocolate drinks, where they help provide a smooth, light consistency, as well as a key ingredient in intermediate products for beverage topping and as a substitute for cream.
For the same properties, caseinates can also be used in the production of ice cream, where they promote an increase in overrun, improve the overall texture of the finished product, and enhance resistance to melting. They are also used in the production of desserts, mousses, and rich creamy sweet fillings.
Due to their emulsifying power, high water retention, and stabilizing and thickening effects, caseinates are widely used in the meat processing industry, for example, in the production of both raw and cooked minced meat products, including emulsified ones such as mortadella, salami, and sausages, as well as in meat-based fillings and stuffing.
These same functions make caseinates ideal ingredients for controlling viscosity and consistency, as well as modulating melting properties in emulsified cheeses and cheese analogues, which are widely used in industrial applications for topping frozen pizzas, hamburger sandwiches, ready meals, and other dishes, offering significant cost savings compared to using conventional cheese.
Caseinates are also used as emulsifiers and viscosity regulators in products such as ready-made soups, vegetable purees, sauces, and dressings. In some ready-to-use powder mixes, whey protein and caseinate blends are used as economical substitutes for skimmed milk powder.
Finally, caseinates are well-known for their use in cream liqueurs, thanks to their stabilizing and texturizing effect on the finished product, which is also made possible by the good resistance of these ingredients to the presence of alcohol.
Which Caseinates to Choose?
The choice of the appropriate type of caseinate among those available on the market should be based on their distinctive characteristics. In this regard, it is important to note that sodium caseinate and potassium caseinate share many similarities, while differing in several aspects from calcium caseinate.
First of all, potassium caseinate, and especially sodium caseinate, are characterized by superior hydration capacity and solubility. When dissolved in water, they tend to form translucent pale yellow suspensions. In contrast, calcium caseinate—due to the larger size of its component particles—produces cloudy, opaque suspensions of dull white color that may form partial sediment over time. Additionally, sodium and potassium caseinate suspensions typically exhibit higher viscosity than those obtained with calcium caseinate and have a smoother, less granular texture.
Another important factor to consider when comparing caseinates is the nature of their component cations.
Sodium caseinate, depending on usage levels, can be a significant source of sodium, which is not always nutritionally desirable. In such cases, alternative caseinates are often preferred. From this perspective, calcium caseinate is a favored choice due to its supply of Ca++ ions, which can complement the functionality of other ingredients (e.g., stabilizers) and serve as an ideal mineral source for fortifying preparations intended for sports nutrition and other specialized dietary needs.
Similarly, potassium caseinate can be preferred in scenarios where maintaining the typical functionalities of sodium caseinate (such as solubility and hydration capacity) is desired without increasing the sodium content in the final product. This is particularly relevant in the enology sector, where it is used for wine clarification and protection against oxidative damage.
