This kind of disorderedstructure leads to obvious physical structure defects, high hardnessand poor flexibility, which seriously affects the application value ofkeratin materials [16–18]. From previous literature, the amountand cross-linking form of disulfide bonds have significant effectson the structure and properties of regenerated keratin materials.Disulfide bond mainly exists in cystine and is one of the mainchemical structures to maintain the secondary structure of keratin.During the extraction and processing, the disordered crosslinkingof disulfide bonds makes the polypeptide chains easy to formagglomeration state, resulting in the keratin materials showingbrittle and hard [19–21].