Demineralized Whey Powder – Definition and Uses

What is Demineralized Whey Powder?

Demineralized whey powder is a dried dairy by-product obtained during the production of cheese or casein, which is subsequently subjected to a specialized demineralization process. During this process, mineral salts such as potassium, sodium, calcium, magnesium, and phosphorus are partially or largely removed to deliberately reduce the mineral content. The result is a fine, pale powder rich in whey proteins and lactose but with a significantly lower mineral content than untreated whey.

The degree of demineralization is commonly expressed as a percentage (e.g., 40%, 70%, or 90%), where a higher percentage indicates a greater reduction in mineral content. Products with a 90% demineralization level are predominantly used in infant and follow-on formula, as their composition more closely resembles that of human breast milk compared to non-demineralized whey.

Manufacturing Process

The production of demineralized whey powder involves several key steps:

• Whey collection: Liquid whey is obtained as a by-product of cheese or casein manufacturing.
• Demineralization: Mineral salts are selectively removed using techniques such as electrodialysis or ion exchange chromatography.
• Evaporation and drying: The demineralized whey is concentrated and then converted into powder form through spray drying.

Nutritional Profile and Composition

Demineralized whey powder is primarily composed of the following components:

• Lactose: The main carbohydrate fraction, serving as an important energy source in infant and toddler nutrition.
• Whey proteins: Including beta-lactoglobulin, alpha-lactalbumin, and immunoglobulins, which supply essential amino acids.
• Residual minerals: Depending on the degree of demineralization, small amounts of calcium, phosphorus, and other trace elements remain in the product.
• Vitamins: Small amounts of water-soluble vitamins may be retained.

Medical and Nutritional Significance

Infant and Toddler Nutrition

The most important application of demineralized whey powder is in the production of infant and follow-on formula. Since bovine milk contains significantly higher mineral concentrations than human breast milk, untreated whey products can place excessive strain on the immature kidneys of newborns. Demineralization reduces the renal solute load and adapts the product more closely to the physiological needs of infants.

Dietetic and Clinical Nutrition

In clinical and dietetic nutrition, demineralized whey powder is used for patients who need to restrict their mineral or electrolyte intake, such as those with chronic kidney disease (CKD) or certain metabolic disorders. The reduced phosphorus and potassium content can be particularly beneficial in these contexts.

Food Industry

Beyond specialized nutrition, demineralized whey powder is widely used in the general food processing industry as an ingredient in baked goods, confectionery, sports nutrition products, and dairy alternatives, due to its functional properties such as emulsification, foaming, and texture improvement.

Safety and Regulation

Demineralized whey powder used in infant and follow-on formula is subject to strict food safety regulations. In the European Union, Commission Delegated Regulation (EU) 2016/127 governs the composition and labeling of such products. Manufacturers must ensure that the degree of demineralization, protein content, and purity comply with all legal requirements.

For healthy adults, demineralized whey powder is generally considered safe. However, individuals with lactose intolerance or a cow's milk allergy should avoid this product, as it contains lactose and whey proteins that may trigger adverse reactions.

References

1. European Commission: Commission Delegated Regulation (EU) 2016/127 supplementing Regulation (EU) No 609/2013 as regards the specific compositional and information requirements for infant formula and follow-on formula.
2. Codex Alimentarius Commission (FAO/WHO): Standard for Infant Formula and Formulas for Special Medical Purposes Intended for Infants (CODEX STAN 72-1981, revised 2007).
3. Holt C, Carver JA, Ecroyd H, Thorn DC: Invited review: Caseins and the casein micelle: Their biological functions, structures, and behavior in foods. Journal of Dairy Science, 2013; 96(10): 6127-6146.