Facts and myths of antibacterial properties of silk.

  • Kaur J
  • Rajkhowa R
  • Afrin T
 et al. 
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Abstract

Silk cocoons provide protection to silkworm from biotic and abiotic hazards during the immobile pupal phase of the lifecycle of silkworms. Protection is particularly important for the wild silk cocoons reared in an open and harsh environment. To understand if some of the cocoon components resist growth of microorganisms, in-vitro studies were performed using gram negative bacteria E. coli to investigate antibacterial properties of silk fibre, silk gum, and calcium oxalate crystals embedded inside some cocoons. The results show that the previously reported antibacterial properties of silk cocoons are actually due to residues of chemicals used to isolate/purify cocoon elements, and properly isolated silk fibre, gum and embedded crystals free from such residues do not have inherent resistance to E. coli. This study removes the uncertainty created by previous studies over the presence of antibacterial properties of silk cocoons, particularly the silk gum, sericin.

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Authors

  • Jasjeet Kaur

  • Rangam Rajkhowa

  • Tarannum Afrin

  • Takuya Tsuzuki

  • Xungai Wang

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