A membrane process for treating zein solutions to increase the zein concentration in the solution. The process uses a non-porous membrane that preferentially permeates the solvent and rejects the zein. Optionally, the process can be operated as a diafiltration process to yield a concentrate of high zein purity.
This invention was made in part with Government support under award numbers DE-FG03-98ER82617 and DE-FG36-02GO12057, both awarded by the Department of Energy. The Government has certain rights in this invention.