Process for preparation of flax protein isolate

A process of preparig a flax protein isolate having a protein content of at least about 90 weight percent, as determined by Kjeldahl nitrogen times 6.25, which comprises:

• initially extracting flax oil seeds to remove mucilage therefrom using a mildly-alkaline aqueous solution of an alkaline material,
• crushing the extracted oil seeds to recover oil and leave a meal, and processing the meal to recover a flax protein isolate therefrom by:
• solubilizing protein in said flax oil seed meal by extracting using an aqueous sodium chloride solution having an ionic strength of at least about 0.10 M at a pH of about 5 to about 7 to provide an aqueous protein solution having a concentration of about 5 to about 40 g/L,
• concentrating the aqueous protein solution while maintaining the ionic strength substantially constant to a concentration of at least about 150 g/L by a selective membrane technique,
• diluting the concentrated protein solution with water having a temperature of less than about 15° C. to form protein micelles, and
• collecting and recovering said protein micelles as a protein micellar mass of flax protein isolate.