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Figure S1. The cross-linking reaction mechanism catalyzed by TGase [1]. Transglutaminase (TGase; protein-glutamine-glutamyltransferase, EC is an enzyme capable of catalyzing acyl transfer reactions by introducing covalent cross-links between proteins and peptides and various primary amines.

Figure S2. The solubility of keratin films in PBS (pH 7.2) at 37°C for seven days (A: The control film; b: TGase modified film). The film without any treatments (A) and the film cross-linked with TGase (30 U/g keratin) at 40°C for 18 h were put into PBS with pH 7.2 and incubated at 37°C for seven days.

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