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Related Experiment Videos

Consequences of forced silking.

Christine S Ortlepp1, John M Gosline

  • 1Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, British Columbia, Canada V6T 1Z4.

Biomacromolecules
|May 11, 2004
PubMed
Summary

Forced spider silk collection uses high forces, unlike natural spinning. This difference in force significantly impacts the silk

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Area of Science:

  • Biomaterials Science
  • Materials Science
  • Biophysics

Background:

  • Forced silking is a standard method for obtaining major ampullate (MA) silk for research.
  • This method may alter the intrinsic properties of the collected spider silk.
  • Understanding the mechanical differences between natural and forced silk is crucial for biomaterial applications.

Purpose of the Study:

  • To quantify the force differences during silk extrusion between unrestrained and restrained spiders.
  • To investigate how these forces affect the resulting major ampullate (MA) silk properties.
  • To determine the impact of silking methodology on silk's polymer network alignment and material characteristics.

Main Methods:

  • Measured the forces required to draw MA silk from unrestrained spiders in free descent.
  • Measured the forces used to draw MA silk from restrained spiders using a motor-driven system.
  • Compared the generated silk stresses relative to the silk's tensile strength for both methods.

Main Results:

  • Freely descending spiders utilize minimal force (0.1 body weights), generating ~2% of silk's tensile strength.
  • Forcibly silked spiders exert high forces (up to 4 body weights) via an internal brake.
  • Forced silking generates stresses exceeding 50% of the silk's tensile strength, impacting polymer alignment.

Conclusions:

  • The high forces in forced silking significantly influence the polymer network alignment of MA silk.
  • Differences in material properties between natural and forced silk are likely due to variations in spinning forces.
  • Internal friction heat during forced silking may limit the maximum silking speed.

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