For lactic acid bacteria (LAB), the pH decline rate was
closely related to the growth performance of the strains. Previous
study has also demonstrated that the pH decline was
strain dependent based on the metabolic activity and the
growth requirement of the strain (Zhang et al., 2014). In accordance
with the previous findings, the microorganism
population of the assessed strain in soy whey had well growth performance through the 24 h of fermentation. The highest
viable cell counts (2.5 × 108 CFU/ml) reached at the 10 h of fermentation.
As probiotics, LAB was considered to provide
therapeutic effects at minimum concentrations of 106 CFU/
ml, and higher viable cell counts in the samples would be
estimated to result in a promoted biological effect (Ghosh,
Chattoraj, & Chattopadhyay, 2013). Therefore, we have prepared
L. plantarum ferment soy whey for 10 h and then to
estimate this product’s antioxidant capacity compared to the
control (unfermented soy whey).