3.2. Analysis of MWD
The MWD of raw soy sauce were analyzed by HPLC and the results are shown in Table 1. As can be seen from Table 1, the percentages of 410 and 5–10 kDa protein fractions in both tanks
showed a steady decline during the aging period. Although the changing trend of MWD in both tanks was similar, the fluctuant scope was different. For soy sauce fermented by A. oryzae FG76,
the percentages of 410 and 5–10 kDa fractions were respectively 8.72% and 16.69% at the period of 5 days, but the corresponding values were dropped to 4.08% and 12.25% at the period of 90 days