Polymer Degradation and Stability |  August 12, 2017

Chemiluminescence from recombinant spider silk under thermo-oxidative degradation

Authors:Koyuru Nakayama1, Anh T.N. Dao1, Kengo Takeuchi1, 2, Junichi Shimokata1,2, Toshiaki Taniike1,

DOI: 10.1016/j.polymdegradstab.2017.08.010

  • 1. Graduate School of Advanced Institute of Science and Technology, Japan Advanced Institute of Science and Technology
  • 2. Spiber Inc.


In this work, the oxidative degradation of recombinant spider silk in a solid state was studied based on chemiluminescence analysis. It was found that the chemiluminescence behavior of the recombinant spider silk closely resembled that of aliphatic polyamide: The emission developed without any induction time, and the maximum intensity was observed in the range of 480–520 nm. In combination with infrared spectroscopy, it was concluded that the oxidative degradation of the recombinant spider silk initiates mainly through the hydroperoxide formation at the Cα position of amino acid residues, and its unimolecular decomposition produces imide or α-keto amide groups together with the CL emission.

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Spiber’s research initiatives into novel protein materials have benefited from subsidies provided by the ImPACT Program on behalf of the Japanese Cabinet’s Council for Science, Technology and Innovation.