Table 2.

Composition and contents of amino acids of OPs.

Amino Acid	Total Amino Acid (g/100 g)	Free Amino Acid (g/100 g)	Hydrolyzed Amino Acid (g/100 g)
Aspartic Acid	2.18	Methionine *	0.23
Threonine *	0.94	Isoleucine *	0.94
Serine	0.78	Leucine *	1.56
Glutamic acid	3.59	Tyrosine	1.09
Proline	0.86	Phenylalanine *	0.55
Glycine	1.79	Lysine	1.33
Alanine	1.79	Histidine	0.31
Cysteine	1.17	Arginine *	1.87
Valine *	0.23	Tryptophan *	0.45
Total	21.66

Note: * essential amino acid.