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Cornstarch-Gelatin Films: Commercial Gelatin Versus Chromed Leather Waste Gelatin and Evaluation of Drying Conditions

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Abstract

In this work, gelatin extracted from chromed leather waste (CLW) was used with cornstarch and glycerol to produce polymeric films. These films were compared with commercial gelatin ones. Gelatin from CLW presented a more pronounced plasticizer behavior than commercial gelatin. It may have occurred due to its lower molar mass, due to the presence of free amino acids from the partial degradation of the protein polypeptide chain during CLW gelatin extraction, and/or due to the presence of high salts content. The high drying temperature (40 °C) made the drying process faster than the starch retrogradation process. It resulted in the reduction of films crystallinity and tensile strength, and in the increase of elongation at break. It also increased equilibrium moisture content, as indicated by water sorption isotherms. FTIR spectra indicated that the absorption bands of cornstarch and CLW gelatin films are the same ones found for films of these materials when not combined, which indicates the presence of a system with phase separation.

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Acknowledgements

This study was realized thanks to the financial support of the Brazilian National Council for Technological and Scientific Development (CNPq), the Rio Grande do Sul State’s Research Support Foundation (FAPERGS) and the University of Caxias do Sul (UCS). Sponsors had no involvement in this study other than providing necessary resources for its execution.

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Authors and Affiliations

  1. Post-Graduation Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Campus do Vale, Avenida Bento Gonçalves, nº 9500, Porto Alegre, RS, 91501–970, Brazil

    Bianca Santinon Scopel

  2. Environmental Engineering Program, University of Caxias do Sul, Caxias do Sul, Brazil

    Maria Eduarda Ribeiro

  3. Chemical Engineering, University of Passo Fundo, Passo Fundo, Brazil

    Aline Dettmer

  4. Engineering of Processes and Technologies Post-Graduate Program, University of Caxias do Sul, Caxias do Sul, Brazil

    Camila Baldasso

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  1. Bianca Santinon Scopel
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  2. Maria Eduarda Ribeiro
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  3. Aline Dettmer
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  4. Camila Baldasso
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Correspondence to Bianca Santinon Scopel.

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Scopel, B.S., Ribeiro, M.E., Dettmer, A. et al. Cornstarch-Gelatin Films: Commercial Gelatin Versus Chromed Leather Waste Gelatin and Evaluation of Drying Conditions. J Polym Environ 26, 1998–2006 (2018). https://doi.org/10.1007/s10924-017-1097-z

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  • DOI: https://doi.org/10.1007/s10924-017-1097-z

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