Gliadin and glutenin were examined to identify peptides that differentiate the proteins. Pronase-resistant fragments from gliadin and glutenin have average molecular weights of 460 and 640, respectively, and in acid are readily converted to pyroglutamic acid (PGA) peptides. PGA-peptides isolated from pepsin-hydrolyzed Pronase digests contained glutamine (Gin) or glutamic acid; proline, serine, ...
