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Casein Hydrolysate: Definition & Uses

Casein hydrolysate is an enzymatically broken-down milk protein that is easy to digest and widely used in infant formula and sports nutrition products.

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Things worth knowing about "Casein hydrolysate"

Casein hydrolysate is an enzymatically broken-down milk protein that is easy to digest and widely used in infant formula and sports nutrition products.

What is Casein Hydrolysate?

Casein hydrolysate is a pre-digested milk protein produced by enzymatic or chemical hydrolysis of casein. During hydrolysis, the long protein chains of casein are broken down into shorter peptides and free amino acids, making the protein easier and faster for the body to absorb compared to intact casein.

Production

Casein is the main protein found in cow's milk, accounting for approximately 80% of total milk protein. To produce casein hydrolysate, casein is treated with enzymes (proteases) or acids to break the peptide bonds. Depending on the degree of hydrolysis, peptide fragments of varying sizes are produced:

Extensive hydrolysate: very small peptides and free amino acids, lowest allergenic potential
Partial hydrolysate: medium-sized peptides, reduced allergenic potential

Applications

Infant Formula

Casein hydrolysate is commonly used in hypoallergenic infant formula (HA formula). Infants at increased risk of cow's milk allergy or those with a confirmed cow's milk protein allergy are often given extensively hydrolysed casein-based products, as the smaller protein fragments are less likely to trigger an immune response.

Sports Nutrition and Dietetics

In sports nutrition, casein hydrolysate is valued for its high biological availability. Compared to intact casein, it is absorbed more rapidly and quickly delivers essential amino acids to support muscle growth and recovery.

Clinical Nutrition

In medical nutrition therapy, casein hydrolysate is used for patients who have difficulty digesting whole proteins, such as those with digestive disorders, post-surgical patients, or individuals with certain metabolic conditions.

Biological Effects and Mechanism of Action

In addition to free amino acids, hydrolysis produces specific bioactive peptides with various physiological effects:

Opioid-like peptides (casomorphins): may influence intestinal motility
Antihypertensive peptides: inhibit the angiotensin-converting enzyme (ACE) and may help lower blood pressure
Immunomodulatory peptides: may support immune function

The precise biological activity of these peptides is the subject of ongoing scientific research.

Tolerability and Safety

Casein hydrolysate is generally well tolerated. However, in rare cases, individuals with a severe cow's milk allergy may still react to extensively hydrolysed casein products. People with lactose intolerance should note that casein hydrolysate is not inherently lactose-free; the lactose content depends on the specific manufacturing process. Anyone suspecting an allergy should always consult a physician.

References

European Food Safety Authority (EFSA): Safety of extensively hydrolysed casein-based formula for infants. EFSA Journal, 2012.
Korhonen H., Pihlanto A.: Bioactive peptides: Production and functionality. International Dairy Journal, 2006; 16(9): 945-960.
Koletzko B. et al.: Nutrition and Development in Infancy and Early Childhood. Monatsschrift Kinderheilkunde, 2016.

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