AlphaLaktalbumin

Alpha-lactalbumin (α-LA) is a small, milk-derived protein found primarily in the whey fraction of bovine milk and, to a lesser extent, in human milk. It belongs to the calmodulin superfamily of proteins and plays a key role in lactose synthesis within mammary gland cells, where it facilitates the transfer of glucose to UDP-galactose to form lactose in the presence of the enzyme galactosyltransferase. Alpha-lactalbumin constitutes approximately 12–18% of the total whey protein in cow’s milk, making it one of the most abundant whey proteins alongside beta-lactoglobulin.

As a heat-sensitive protein, α-LA denatures and unfolds at temperatures above 70°C (158°F), which affects its solubility and functional properties. This characteristic influences its behavior during food processing, such as pasteurization and fermentation. The protein is also known for its ability to bind calcium ions, which stabilizes its structure and influences its biological activity.

Beyond its nutritional role, α-LA has been studied for its potential health benefits, including antimicrobial properties and involvement in immune modulation. Some research suggests it may have prebiotic effects by promoting the growth of beneficial gut bacteria. Additionally, it has been explored as a potential therapeutic agent due to its role in calcium metabolism and its influence on cell signaling pathways.

In industrial applications, α-LA is used in food production as an emulsifier and stabilizer, improving texture and mouthfeel in dairy products. It is also a component of various dietary supplements, often marketed for its role in lactose digestion support or as a source of essential amino acids. However, individuals with cow’s milk protein allergy may experience adverse reactions to α-LA, necessitating caution in its consumption.