A method for producing a water-soluble protein concentrate from plant biomass is disclosed, comprising: obtaining plant matter from said plant biomass； drying said plant matter； grinding said dry plant matter； de-chlorophyllizing said ground dry plant matter； treating said ground dry de-chlorophyllized plant matter with water, thereby at least partially dissolving water-soluble protein content of said dry de-chlorophyllized plant matter and preparing an aqueous suspension of said dry de-chlorophyllized plant matter； separating said aqueous suspension of said dry de-chlorophyllized plant matter into a first neutral extract and a wet solid； and, drying said first neutral extract, thereby yielding a water-soluble protein concentrate. Also disclosed is a water-soluble protein concentrate produced by the method.
