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. 2023 Apr 25;14(4):585–591. doi: 10.1016/j.advnut.2023.04.008

TABLE 3.

Ileal digestibility of amino acids in proteins used in infant formula and wheat1

Indispensable amino acid Ingredient
Digestibility %
WPI WPC MPC SMP SPI Wheat2
Isoleucine 98 97 93 89 95 86
Leucine 99 98 98 94 95 86
Lysine 98 96 96 95 97 77
Methionine 98 97 97 96 96 88
Phenylalanine 98 96 97 94 96 87
Threonine 94 91 93 82 92 80
Tryptophan 100 98 97 91 96 74
Valine 97 95 94 90 94 83

Abbreviations: MPC, milk protein concentrate; SMP, skim milk powder; SPI, soy protein isolate; WPC, whey protein concentrate; WPI, whey protein isolate.

1

From Mathai et al. [45].

2

Shown for comparison with a protein source not used in infant formula.