Figure 2: Effects of the crude effluent pH on both β-amylase recovery (as A) in the centrifugal supernatant out of the effluent (i.e. Sample 1#) (shown as Curve a) and that in the retentate out of the feed to the first 3 kDa MWCO centrifugal UF device (shown as Curve b), and the effect of temperature on β-amylase recovery (as C) in the retentate of the 3 kDa MWCO centrifugal UF device (the feed to this UF is the centrifugal supernatant of Sample 1# pre-adjusted to pH 7). The centrifuge for Curve a of A was at 25°C and 3050 × g for 10 min. With a loading volume of 15 ml, the centrifugal UF (for Curve b of A) was conducted at 3050 × g and 4°C for 20 min.Effects of the feed pH and UF operation pressure on the filtration flux at 25°C for 3 kDa MWCO membrane for the spiral-wound device for concentrating the pH adjusted crude soybean whey (i.e. for preparing Sample 2# from Sample 1#, denoted in Table 1).(▲) soybean whey at pH 5.0, (*) soybean whey at pH 6.0, (▲) soybean whey at pH 7.0, (▲) soybean whey at pH 8.0, (●) soybean whey at pH 9.0