MILK PROTEINS 225
Whey
I
Protein
I0^0
pH < 4.6 pH > 4.6
Lactose
Minerals
Cationic exchangeresin
(vistec, Spherosil S) Anion [Spherosil exchangeMn OMA)
\
Eluate \ Retentate / Eluate
minerals
Minerals
t
WPI
Figure 4.41 Production of whey protein isolate (WPI) by ion exchange adsorption (from
Mulvihill, 1992).
trodialysis to less than about 0.02% ash, 8-1s precipitates and can be
removed by centrifugation with a yield of more than 90%.
The ion exchangers used to recover total whey protein (WPI) may also
be used to fractionate whey proteins. All the whey proteins are adsorbed
initially on Spherosil QMA resin but on continued passage of whey through