Molecular weight is an important parameter reflecting the hydrolysis of protein, which further
correlates with the bioactivity of protein hydrolysates (Li et al.,
2008). Therefore, the increase of mid and low molecular weight
peptides was originated from the degradation of 5–10 and
410 kDa fractions, and the results of MWD briefly indicated that
the fused strain of A. oryzae FG76 had a more powerful ability to
degrade the protein macromolecules into small molecular weight
peptides during soy sauce fermentation than the control of A.
oryzae HN3042.