So PP is higher than SPI and closer to 1.We obtain that the first limit amino acid is TRY and the second limit amino acid is MET and CYS from PP.

• 利用化学评价法得出PP的第一限制氨基酸为色氨酸，第二限制氨基酸为含硫氨基酸-蛋氨酸和胱氨酸。