Fig. 3From: Thiolation and characterization of regenerated Bombyx mori silk fibroin films with reduced glutathioneHigh-resolution XPS spectra of the S 2p region measured from a silk fibroin film surface before (a) and after (b) the carbodiimide coupling reaction with GSH. Raw data are represented with a solid black line, and individual Voigt-fit components are represented with solid colored linesBack to article page