Free Amino Acids and Soluble Peptides of Whey Powders

Abstract

The quantities of free amino acids and soluble peptides in seven whey powders were determined. Free amino acids in four acid whey powders averaged .59% (range .1 to 1.1%) and in three sweet whey powders .34% (range .1 to .64%). Combined free amino acids and soluble peptides averaged 2.96 and 2.27%. The predominating amino acids in the free amino acid pool were glutamic acid, proline, lysine, tyrosine, aspartic acid, and arginine and in the combined free amino acid-soluble peptide pool, glutamic acid, proline, threonine, aspartic acid, lysine, and serine. © 1973, American Dairy Science Association. All rights reserved.