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- W120733662 abstract "Abstract The fate of Protease N (IUB 3.4.24.28, Bacillus subtilis ) enzyme was monitored while being used to hydrolyse an initial concentration of 5% (w/v) whey protein isolate (86.98% Kjeldahl nitrogen × 6.38) continuously for 5 h at pH 7.0 and 55 °C in an enzymatic membrane reactor (EMR) fitted with a 10 kDa tangential flow filter (TFF). The retentate temperature (A: 25–55 °C), initial water permeate flux, J i (B: 1.6–18.4 mL/min) and enzyme concentration (C: 0.5–5.5 g) were varied and optimised using response surface methodology (RSM) central composite rotatable design (CCRD). The residual enzyme activity ( A residual ), enzyme leakage ( A leakage ), enzyme loss ( A loss ), average permeate flux ( J average ) and nitrogen recovered in permeate (apparent sieving, S apparent ) were determined. A leakage was independent of enzyme concentration but increased concomitant with increasing A and B, while both A residual and A loss decreased with increasing J i . Protease N was inhibited by WPI and hydrolysates. At 50 °C Protease N enzyme solubilised the concentration polarisation layer (GPL), stabilised J average and led to higher A leakage . Principal components analysis isolated the EMR hydrodynamics due to the retentate temperature, S apparent , A leakage and J average as factors providing prominent influence in the EMR (principal components 1 and 3 which caused ca. 60% of the EMR variance) while principal component 2 (‘measure’ of Protease N enzyme property within the reactor) contributed 27.78%. The fate of the enzyme was accounted for as a balance between A residual , A leakage and A loss ." @default.
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- W120733662 date "2006-12-01" @default.
- W120733662 modified "2023-09-23" @default.
- W120733662 title "Hydrolysis of whey protein isolate in a tangential flow filter membrane reactor" @default.
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- W120733662 doi "https://doi.org/10.1016/j.memsci.2006.10.019" @default.
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