Difference between revisions of "Back to Bombyx"

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(Obtaining Silk Protein)
 
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Silk Worms are Back!<br>
 
Silk Worms are Back!<br>
 
[https://en.wikipedia.org/wiki/Bombyx_mori ''Bombyx mori''] is the domesticated silk worm bred for silk production.
 
[https://en.wikipedia.org/wiki/Bombyx_mori ''Bombyx mori''] is the domesticated silk worm bred for silk production.
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==Introduction==
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Silk is an interesting biomaterial, that can be easily sterilized with alcohol, to make gels, to print, etc...<br><br>
  
 
==Methods==
 
==Methods==
 
===Obtaining Silk Protein===
 
===Obtaining Silk Protein===
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[[File:Now18_6.jpg|200px|right|https://www.hiroshima-u.ac.jp/en/research/now/no18]]
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What is used as biomaterials is the '''fibroin''' part of the silk thread and cocoon. (See image to the right, from [https://www.hiroshima-u.ac.jp/en/research/now/no18 Professor Norihisa Kato]'s lab, Hiroshima University).<br>
 
The dissolution conditions seem to be different between the domesticated Bombyx, and other wild strains.<br>
 
The dissolution conditions seem to be different between the domesticated Bombyx, and other wild strains.<br>
# Degumming or removal of sericin - 5g/L sodium carbonate, pH, T, 1h (for Bombyx).
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# Degumming or removal of '''sericin''' - 5g/L sodium carbonate, pH, T, 1h (for Bombyx).
# Dissolution of fibroin
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# Dissolution of '''fibroin'''
[https://drive.google.com/file/d/0BzF8kxTIehaoV2Y0VGZvUUFEWTg/view Step-by-step documentation] from HTGAA 2015 from silklab
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[https://drive.google.com/file/d/0BzF8kxTIehaoV2Y0VGZvUUFEWTg/view Step-by-step documentation] from HTGAA 2015 from silklab<br><br>
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This [http://www.sciencedirect.com/science/article/pii/S0032386108006915 review paper] from 2008 is a nice resource.
  
 
===LiBr or not===
 
===LiBr or not===
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* [https://books.google.co.in/books?id=HCbiq-3tzYAC&pg=PA35&lpg=PA35&dq=silkworm.genomics.org.cn&source=bl&ots=d-V6Z4H6K3&sig=U8YLJfB1TZVq3Nk49nrLF20Ctvs&hl=en&sa=X&ved=0ahUKEwiMmqyo5ebSAhWIQY8KHeu1AecQ6AEIUzAJ#v=onepage&q=silkworm.genomics.org.cn&f=false Table 2.2 Genomics and Functional Genomics Resources] Molecular Biology and Genetics of the Lepidoptera edited by Marian R. Goldsmith, Frantisek Marec, CRC Press ISBN 1420060201, 9781420060201.
 
* [https://books.google.co.in/books?id=HCbiq-3tzYAC&pg=PA35&lpg=PA35&dq=silkworm.genomics.org.cn&source=bl&ots=d-V6Z4H6K3&sig=U8YLJfB1TZVq3Nk49nrLF20Ctvs&hl=en&sa=X&ved=0ahUKEwiMmqyo5ebSAhWIQY8KHeu1AecQ6AEIUzAJ#v=onepage&q=silkworm.genomics.org.cn&f=false Table 2.2 Genomics and Functional Genomics Resources] Molecular Biology and Genetics of the Lepidoptera edited by Marian R. Goldsmith, Frantisek Marec, CRC Press ISBN 1420060201, 9781420060201.
 
* [http://journal.frontiersin.org/article/10.3389/fphys.2015.00119/full Key enzymes and proteins of crop insects as candidate for RNAi based gene silencing] Kola et al. Department of Biotechnology, Directorate of Rice Research, ICAR-Indian Institute of Rice Research, Hyderabad, India. Front. Physiol., 22 April 2015 | https://doi.org/10.3389/fphys.2015.00119
 
* [http://journal.frontiersin.org/article/10.3389/fphys.2015.00119/full Key enzymes and proteins of crop insects as candidate for RNAi based gene silencing] Kola et al. Department of Biotechnology, Directorate of Rice Research, ICAR-Indian Institute of Rice Research, Hyderabad, India. Front. Physiol., 22 April 2015 | https://doi.org/10.3389/fphys.2015.00119
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[[Category:Materials]][[Category:Wetware]]

Latest revision as of 13:22, 15 May 2017

Silkcocoons india.JPG

Silk Worms are Back!
Bombyx mori is the domesticated silk worm bred for silk production.

Introduction

Silk is an interesting biomaterial, that can be easily sterilized with alcohol, to make gels, to print, etc...

Methods

Obtaining Silk Protein

https://www.hiroshima-u.ac.jp/en/research/now/no18

What is used as biomaterials is the fibroin part of the silk thread and cocoon. (See image to the right, from Professor Norihisa Kato's lab, Hiroshima University).
The dissolution conditions seem to be different between the domesticated Bombyx, and other wild strains.

  1. Degumming or removal of sericin - 5g/L sodium carbonate, pH, T, 1h (for Bombyx).
  2. Dissolution of fibroin

Step-by-step documentation from HTGAA 2015 from silklab


This review paper from 2008 is a nice resource.

LiBr or not

Lithium Bromide (LiBr), while one can source it online, as a non-institutional person, still can be hard to find.
Brief summary of reading some papers is that LiBr is the best for degummed fibers of silk cocoons, where nearly 100% can be solubilized in LiBr, compared to 30% in CaCl2, or 50% NaSCN (sodium thiocyanate) (numbers taken from Addis and Raina 2013).
A Researchgate thread mentioned "2.5wt% silk fibroin in 28% ammonium aqueous solution by magnetic stirring."

Sourcing

CH

IN

  • Department of Sericulture Government of Karnataka
  • Silkworm Seed Production Centre, Government Office Bengaluru, Karnataka
  • National Silkworm Seed Organization, Agricultural Seed Store, Bengaluru, Karnataka
  • Silk Worm Breeding Unit, Bengaluru, Karnataka
  • Sri Lingeshwara Silk Worm Seed Product, Kamenahalli, Karnataka

References

About the Silk Worm

Material Properties and Methods

  • Polyol-Silk Bioink Formulations as Two-Part Room-Temperature Curable Materials for 3D Printing ACS Biomater. Sci. Eng., 2015, 1 (9), pp 780–788 DOI: 10.1021/acsbiomaterials.5b00160: The researchers combined silk proteins, which are biocompatible, and glycerol, a non-toxic sugar alcohol commonly found in food and pharmaceutical products. The resulting ink was clear, flexible, stable in water, and didn’t require any processing methods.
  • Pdf of Materials fabrication from Bombyx mori silk fibroin, Nat Protoc. 2011 Sep 22;6(10):1612-31. doi: 10.1038/nprot.2011.379.
  • HTGAA 2015 Lucern documentation on bioprinting

Molecular Biology