Abstract
For the first time, pure protein fibers with good mechanical properties were obtained from waste wool after effective de-crosslinking and disentanglement of the highly crosslinked keratin. Every year, more than 1.6 billion pounds of wool keratin-based materials were discarded. Effort has been devoted to convert the keratin resources into high value-added products, especially fibers. In 1940s, pure keratin fibers had been developed from feathers. However, after trying the method, we found the results were not repeatable and did not find any other successful repetition. So far, no effective dissolution and spinning methods have been developed to obtain pure keratin fibers with potential for real applications. In this research, keratin with preserved backbones after de-crosslinking was obtained. Subsequently, surfactant endowed the keratin with satisfactory stretchability for fiber spinning. Fibers of 20 μm with good tensile strength were successfully developed. The technology could be applied onto other highly crosslinked proteins, including feather keratin from poultry industry, sorghum protein and soy protein in bioenergy co-products for production of various industrial products.
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Acknowledgements
This research was financially supported by the Agricultural Research Division at the University of Nebraska-Lincoln, USDA Hatch Act, Multistate Research Project S-1054 (NEB 37-037) and Nebraska Environmental Trust (13-142). The authors thank the AATCC student research grant for Zhuanzhuan Ma. The authors also thank Dr. Han Chen for his help in SEM.
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Xu, H., Ma, Z. & Yang, Y. Dissolution and regeneration of wool via controlled disintegration and disentanglement of highly crosslinked keratin. J Mater Sci 49, 7513–7521 (2014). https://doi.org/10.1007/s10853-014-8457-z
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DOI: https://doi.org/10.1007/s10853-014-8457-z