Hydrolysate – Definition, Types & Uses
A hydrolysate is a substance produced by hydrolysis, breaking larger molecules into smaller components. In medicine and nutrition, hydrolysates are used as easily digestible protein sources.
Things worth knowing about "Hydrolysate"
A hydrolysate is a substance produced by hydrolysis, breaking larger molecules into smaller components. In medicine and nutrition, hydrolysates are used as easily digestible protein sources.
What is a Hydrolysate?
A hydrolysate is produced through a chemical process called hydrolysis, in which water (Greek: hydro) splits a chemical compound into smaller building blocks (Greek: lysis = loosening, splitting). Depending on the starting substance, different types of hydrolysates can be created, such as protein hydrolysates, carbohydrate hydrolysates, or fat hydrolysates. Hydrolysates play an important role in medicine, pharmacy, and nutritional science.
Types of Hydrolysates
Protein Hydrolysates
Protein hydrolysates are formed when proteins are broken down into their basic building blocks – amino acids and peptides – through hydrolysis. This can be achieved enzymatically (using enzymes such as proteases), chemically (using acids or alkalis), or thermally (using heat). Well-known examples include:
- Whey protein hydrolysate: Derived from whey and used as an easily digestible protein source in sports nutrition and specialized foods.
- Casein hydrolysate: Derived from milk protein and used in infant formula and clinical nutrition.
- Collagen hydrolysate: Derived from animal connective tissue and commonly marketed as a supplement for joints and skin.
- Soy protein hydrolysate: A plant-based alternative, often used in hypoallergenic nutrition products.
Carbohydrate Hydrolysates
Carbohydrates such as starch can be broken down by hydrolysis into simpler sugars like glucose or maltose. A well-known example is glucose syrup, produced by the enzymatic hydrolysis of starch.
Fat Hydrolysates
Fats (triglycerides) are hydrolyzed into glycerol and fatty acids. This process plays a role in both digestion and industrial food processing.
Medical and Nutritional Significance
Hydrolysates are used in a variety of medical and nutritional contexts:
- Hypoallergenic infant formula: Extensively hydrolyzed proteins are used in infant formulas for babies with cow's milk protein allergy or an elevated risk of allergy, as the fragmented proteins are less likely to trigger allergic reactions.
- Clinical nutrition: In patients with digestive disorders, malabsorption syndromes, or following surgery, hydrolysates serve as easily absorbable nutrient sources.
- Sports nutrition: Protein hydrolysates are used by athletes because they are absorbed more rapidly by the body than intact proteins.
- Dietary supplements: Collagen hydrolysate is offered as a supplement to support joint, bone, and skin health.
Production of Hydrolysates
Hydrolysates can be produced in several ways:
- Enzymatic hydrolysis: Specific enzymes cleave targeted bonds within the molecule. This method is gentle and yields well-defined products.
- Acid hydrolysis: Acids such as hydrochloric acid are used to break apart compounds. This method is less specific.
- Alkaline hydrolysis: Alkalis such as sodium hydroxide are used to cleave bonds.
- Thermal hydrolysis: Elevated temperatures promote the breaking of chemical bonds.
Safety and Tolerability
Hydrolysates are generally considered well-tolerated. One potential drawback of protein hydrolysates is a bitter taste caused by the release of certain peptides during processing. When using hydrolysate-based infant formulas, it is recommended to follow the guidance of a pediatrician. Individuals with specific food allergies should always check the source material of a hydrolysate, as residual allergens may be present.
References
- Moughan, P.J. et al. (2021): Protein digestibility-corrected amino acid scores and protein quality evaluation. British Journal of Nutrition, 126(S1), S1-S34.
- European Food Safety Authority (EFSA) (2014): Scientific Opinion on the essential composition of infant and follow-on formulae. EFSA Journal, 12(7):3760.
- Hartmann, R. & Meisel, H. (2007): Food-derived peptides with biological activity: from research to food applications. Current Opinion in Biotechnology, 18(2), 163-169.
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