Aqueous epigallocatechin gallate (EGCG) solutions are concentrated by a process comprising feeding an aqueous EGCG solution to at least one memberane module under pressure to provide a permeate purge and a retentate return wherein in the latter the concentration of EGCG is increased; collecting said permeate purge and said retentate return; optionally recycling the retentate return back to the memberane; and optionally concentrating the retentate return and the permeate purge.
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