Patent 7977066 was granted and assigned to Campina (company) on July, 2011 by the United States Patent and Trademark Office.
Described is a method for selectively isolating tryptophan containing peptides from an aqueous peptide mixture, including the steps of controlling the pH of the aqueous peptide mixture to 4.0-6.0, forming a precipitate of tryptophan containing peptides, and isolating the precipitated peptides.