Table 1.

Amino acid composition of isolated proteins

Amino acid	Milligrams of amino acid per gram of protein
	α-LAa	Wheyb	Casein	Eggc	Beefd	Soy	Wheat
Histidine	30	22	25	26	34	19	20
Isoleucine	60	55	47	56	44	49	42
Leucine	108	122	89	94	82	78	68
Lysine	109	112	76	76	90	51	26
Methionine	10	23	26	39	29	13	17
Cysteine	48	30	3	26	11	12	22
Phenylalanine	41	36	51	66	39	43	58
Threonine	43	45	44	45	44	38	28
Tryptophan	48	27	12	17	12	13	9
Valine	43	52	59	73	46	47	43

Abbreviation: α-LA, α-lactalbumin.

^aα-Lactalbumin from Agropur Ingredients, Eden Prairie, Minnesota.

^bWhey protein isolate from Agropur Ingredients, Eden Prairie, Minnesota.

^cEgg white, USDA Nutrient Composition Databases.⁴

^dBeef sirloin, USDA Nutrient Composition Databases.⁴