Water and methanol extracts of fermented soybean were prepared
by adding soybean powder to respective solvents
(1:10, w/v) and shaking at 28 ± 2 °C for 4 h. The methanol extracts
were filtered using a Whatman No.1 filter paper, whereas
the water extracts were centrifuged at 8000 g for 20 min and
the supernatant was stored at 4 °C. All extracts were further