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Amino acid composition of silk fibroin solutions with different amounts of sericin. The ratio of mole percent of serine and glycine residues was used to compare the different samples, with pure silk fibroin samples having a ratio of 0.19 while pure sericin samples had a ratio of 1.27. The detection limit of this method is between 1.0% and 10% w/w of sericin content.
