Combining Living Microorganisms with Regenerated Silk Provides Nanofibril-Based Thin Films with Heat-Responsive Wrinkled States for Smart Food Packaging

Nanomaterials
L ValentiniN M Pugno

Abstract

Regenerated silk (RS) is a protein-based "biopolymer" that enables the design of new materials; here, we called "bionic" the process of regenerated silk production by a fermentation-assisted method. Based on yeast's fermentation, here we produced a living hybrid composite made of regenerated silk nanofibrils and a single-cell fungi, the Saccharomyces cerevisiae yeast extract, by fermentation of such microorganisms at room temperature in a dissolution bath of silkworm silk fibers. The fermentation-based processing enhances the beta-sheet content of the RS, corresponding to a reduction in water permeability and CO₂ diffusion through RS/yeast thin films enabling the fabrication of a mechanically robust film that enhances food storage durability. Finally, a transfer print method, which consists of transferring RS and RS/yeast film layers onto a self-adherent paraffin substrate, was used for the realization of heat-responsive wrinkles by exploiting the high thermal expansion of the paraffin substrate that regulates the applied strain, resulting in a switchable coating morphology from the wrinkle-free state to a wrinkled state if the food temperature overcomes a designed threshold. We envision that such efficient and smart coatings c...Continue Reading

References

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Jun 10, 2016·Scientific Reports·Luca ValentiniNicola M Pugno
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Citations

Feb 6, 2019·Nanoscale·Nicola M Pugno, Luca Valentini
Apr 10, 2019·Polymers·Francesca LionettoMariaenrica Frigione
Mar 13, 2021·Advanced Sustainable Systems·Sanjana GopalakrishnanVincent M Rotello

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Methods Mentioned

BETA
scanning electron microscopy
atomic force microscopy
AFM

Software Mentioned

Gwyddion
Origin
Nanosurf easyScan

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