Effects of Chemical Post-treatments on Structural and Physicochemical Properties of Silk Fibroin Films Obtained From Silk Fibrous Waste

Melissa Puerta, Maria S. Peresin, Adriana Restrepo-Osorio

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    6 Scopus citations

    Abstract

    Silk fibroin (SF) is a protein polymer claimed to have outstanding potential for medical applications. However, because of the manufacturing process, materials from regenerated SF exhibit a higher percentage of amorphous structures. The amorphous structures cause the material to be water soluble and can significantly limit its applications in wet biological environments. In order to increase the amount of crystalline structures and decrease the water solubility of SF materials, post-treatment with alcohols is usually employed. SF can be obtained from silk fibrous wastes (SFW), usually discarded in silk textile processes. This represents an opportunity to produce materials with high added value from low-cost natural sources. In this study, SF was obtained from SFW, and films were made thereof followed by a post-treatment by immersion or in a saturated atmosphere of methanol (MeOH) or ethanol (EtOH), using different exposure times. The resulting films were analyzed according to crystallinity, the percentage of crystalline and amorphous structures, and thermal stability. Also, water absorption and weight loss in aqueous media were determined. The results showed a significant increase in crystalline structures in all treated samples, varying according to the type and time of exposure to post-treatment conducted. The highest increase was shown in the case of the post-treatment by immersion in MeOH for 1 h, with a 23% increase over the untreated sample. This increase in crystallinity was reflected in an increase in the degradation temperature and a degradation rate of 5.3% on day 7. The possibility of tuning the degree of crystallinity, as well as thermal stability and aqueous integrity of thin films of SFW, can be applied to adjust these materials to the requirements of specific biomedical applications.

    Original languageEnglish
    Article number523949
    JournalFrontiers in Bioengineering and Biotechnology
    Volume8
    DOIs
    StatePublished - 2 Dec 2020

    Bibliographical note

    Funding Information:
    Acknowledgments to Centro de Investigación para el Desarrollo y la Innovación (CIDI) of the Universidad Pontificia Bolivariana for financial the advanced training scholarship for the master’s student to MP.

    Funding Information:
    Acknowledgments to Centro de Investigaci?n para el Desarrollo y la Innovaci?n (CIDI) of the Universidad Pontificia Bolivariana for financial the advanced training scholarship for the master?s student to MP. Funding. This research received financial support to Ministerio de Ciencia y Tecnolog?a (MINCIENCIAS) of the research project 121080762864. Additional support from the Alabama Experimental Station, the HATCH Program (ALA013-1-17003), and the McIntire Stennis Program (ALAZ00076) of the National Institute of Food and Agriculture, United States Department of Agriculture.

    Funding Information:
    This research received financial support to Ministerio de Ciencia y Tecnología (MINCIENCIAS) of the research project 121080762864. Additional support from the Alabama Experimental Station, the HATCH Program (ALA013-1-17003), and the McIntire Stennis Program (ALAZ00076) of the National Institute of Food and Agriculture, United States Department of Agriculture.

    Publisher Copyright:
    © Copyright © 2020 Puerta, Peresin and Restrepo-Osorio.

    Keywords

    • alcohol post-treatment
    • secondary structure
    • silk fibroin
    • silk fibrous waste
    • water stability

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