stage; for example, the content of alanine increased from 16.41 mg/L at
0 d to 84.43 mg/L in the initial fermentation stage, and then decreased
from 84.43 mg/L to 77.60 mg/L in the end-fermentation stage. The content
of serine and threonine also increased in concentration and this
was most rapid during the mid-fermentation stage; the concentration
of threonine at the mid-fermentation stage was 7 times that at 0 d.
Histidine was the only amino acid that decreased in concentration during
fermentation, dropping from 8.32 mg/L at 0 d to 3.65 mg/L in the mid fermentation
stage