After 48 h of the fermentation, the levels of peptide with MW
less than 1000 Da (Fig. 7) in the three samples fermented by
B. animalis 937, L. casei Zhang and L. plantarum P-8 mixed with
B. subtilis natto increased 30.7%, 71.2%, and 81.3% relative to that of
the control group. And the levels of peptide with MW more than