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Related Experiment Video

Updated: Jul 19, 2025

Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers
08:28

Microfluidic Dry-spinning and Characterization of Regenerated Silk Fibroin Fibers

Published on: September 4, 2017

9.9K

Pulling and analyzing silk fibers from aqueous solution using a robotic device.

Teemu Välisalmi1, Houari Bettahar2, Quan Zhou2

  • 1Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, FI-00076 Aalto, Finland; Centre of Excellence in Life-Inspired Hybrid Materials (LIBER), Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland.

International Journal of Biological Macromolecules
|August 7, 2023
PubMed
Summary

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A new robotic device enables controlled pulling and force measurement for artificial silk production. This method improves regenerated silk fibroin fiber strength compared to traditional extrusion techniques.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Robotics

Background:

  • Natural silks possess exceptional properties, but artificial spinning methods often yield inferior fibers.
  • Current artificial spinning techniques primarily rely on extrusion, lacking the pulling component crucial in natural spinning.
  • A lack of feedback control during the extension phase limits the optimization of artificial silk properties.

Purpose of the Study:

  • To develop and demonstrate a robotic fiber pulling device for controlled artificial silk spinning.
  • To investigate the effects of controlled pulling and in situ force measurement on fiber properties.
  • To compare the mechanical properties of artificially spun recombinant spider silk and regenerated silk fibroin.

Main Methods:

  • Development of a robotic fiber pulling device with integrated force measurement capabilities.
Keywords:
Liquid-liquid phase separationProtein fiberSpidroin

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Last Updated: Jul 19, 2025

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  • Application of the device to spin fibers from recombinant spider silk (ADF3 variant) and regenerated silk fibroin.
  • Utilizing dextran as a reference material for validating the spinning procedure.
  • Conducting tensile testing on the pulled fibers to evaluate mechanical properties.

    • Main Results:

    • Pulled regenerated silk fibroin fibers exhibited high tensile strength, surpassing that of fibers produced by extrusion-based methods.
    • The mechanical properties of recombinant spider silk fibers appeared to be influenced by liquid-liquid phase separation of silk proteins.
    • The robotic device successfully enabled controlled pulling and in situ force measurement during fiber formation.

    Conclusions:

    • Controlled fiber pulling, mimicking natural spinning processes, can significantly enhance the mechanical properties of artificial silks, particularly regenerated silk fibroin.
    • The developed robotic pulling device offers a novel platform for studying and optimizing artificial fiber spinning.
    • Understanding protein phase separation is crucial for tailoring the properties of recombinant spider silks.