International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Dissolution, crystallilnity, and mechanical properties of silk sericin from Sericinjam silkworm cocoons

  • Yun Yeong Choi (Department of Biofibers and Biomaterials Science, Kyungpook National University) ;
  • Seong Wan Kim (National Institute of Agricultural Sciences, RDA) ;
  • Kee Young Kim (National Institute of Agricultural Sciences, RDA) ;
  • In Chul Um (Department of Biofibers and Biomaterials Science, Kyungpook National University)
  • Received : 2023.02.21
  • Accepted : 2023.03.15
  • Published : 2023.03.31
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Abstract

Recently, a silkworm strain (tentatively named Sericinjam) producing 100% sericin cocoons has been studied in South Korea. In this preliminary study, the crystallinity, mechanical properties, and dissolution conditions of sericin from Sericinjam cocoons were examined. The Sericinjam cocoon could be dissolved in water at high temperature (120℃) and high pressure (HTHP method) in an autoclave and in a CaCl2/H2O/EtOH mixture (ternary solvent method), resulting in 82% and 97% dissolution after 30 min, respectively. The solution viscosity of the silk sericin formic acid (SSFA) solution obtained from sericin extracted using the ternary solvent method was higher than that obtained using the HTHP method; however, SSFA solutions obtained from sericin extracted from conventional Baekokjam cocoons yielded a higher solution viscosity. The crystallinity and breaking strength of the sericin film from Sericinjam cocoons were slightly lower, respectively, than those from Baekokjam cocoons. In contrast, the elongation at break of the Sericinjam sericin film obtained using the HTHP method was higher than that of the Baekokjam sericin film.

Keywords

Acknowledgement

This study was performed with the support of the Research Program for Agricultural Science & Technology Development (PJ016130), National Academy of Agricultural Science, Rural Development Administration, Republic of Korea. The authors appreciate the support.

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