Table 4. Changes in free amino acid contents of WPC after fermentation

Amino acid	Concentration (mg/100 g)
	WPC	FWP
Threonine	1.37	3.29
Cystine	0	0
Tyrosine	1.28	3.78
Arginine	2.07	4.35
Alanine	0.79	14.05
Proline	3.73	22.48
Lysine	1.67	6.89
Histidine	0.45	3.71
Isoleucine	0.92	5.96
Leucine	2.14	18.37
Methionine	0.43	3.31
Phenylalanine	0.89	2.88
Tryptophan	0.9	1.25
Valine	1.68	21.18
Glutamic acid	2.31	64.67
Asparagine	0.43	4.12
Serine	0	0
Glycine	0.85	2.4
Total free amino acid	21.91	182.69

WPC, whey protein concentrate; FWP, fermented whey protein.