Vitamin E and selenium concentrations in milk and milkfractions

Area of Science:

• Nutritional Science
• Food Chemistry
• Biochemistry

Background:

• Cow's milk is a common dietary staple and a base for infant formulas.
• Understanding its nutrient composition, including vitamin E and selenium, is crucial for infant nutrition.
• Variations in nutrient content due to factors like lactation stage and season are important considerations.

Purpose of the Study:

• To analyze the vitamin E and selenium content in cow's milk across different lactation stages and seasons.
• To compare the nutrient profiles of cow's milk with human milk.
• To investigate the distribution of selenium within different protein fractions of cow's milk.

Main Methods:

• Analysis of vitamin E and selenium concentrations in cow's milk samples.
• Comparative analysis with established human milk data.
• Determination of selenium content in casein and whey protein fractions.

Main Results:

• Vitamin E and selenium concentrations in cow's milk varied significantly with lactation stage and season.
• Cow's milk exhibited substantially lower vitamin E levels compared to human milk.
• Selenium concentrations were found to be similar between cow's milk and human milk.
• Whey proteins in cow's milk contained higher selenium concentrations than caseins.

Conclusions:

• Cow's milk nutrient composition, specifically vitamin E and selenium, is influenced by lactation stage and season.
• The lower vitamin E content in cow's milk necessitates supplementation, such as alpha-tocopheryl acetate, for infant formulas.
• Selenium is preferentially located in the whey protein fraction of cow's milk.