| http://www.w3.org/ns/prov#value | - In the precipitation zone 42, the acid is added and the selected pH is preferably maintained for a sufficient period of time, for example between about 15 minutes to about 30 minutes, to allow a substantial portion of the isoelectric proteins to aggregate. [0102] The PPI is preferably passed to a PPI washing zone 46 via line 44 where it may be washed with water and may be neutralized with a base t
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