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Mechanical Properties, Water Vapor Permeability and Water Affinity of Feather Keratin Films Plasticized with Sorbitol

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Abstract

In poultry industry chicken feathers are normally hydrolyzed and used to prepare animal feed. In this work the use of this material to prepare films was investigated. Keratins were extracted from chicken feathers with 2-mercaptoethanol in concentrated urea solution using sodium dodecyl sulfate (SDS). The effect of varying the amount of sorbitol on properties of chicken feather keratin (CFK) was investigated. As the concentration of plasticizer increased, the moisture content (MC) of these films increase, the monolayer MC increased from 0.060 (without plasticizer) to 0.482 g water/g dry matter (0.30 g sorbitol/g keratin). The water vapor permeability (WVP) varied between 0.096 g/m s Pa and 8.098 g/m s Pa for films without sorbitol and with 0.30 g sorbitol/g keratin, respectively. Film strength decreased from 5.13 MPa to 0.45 MPa and the elongation at break achieved the maximum value of 52.75% for samples with 0.02 g sorbitol/g keratin. The dry matter density didn’t change significantly, varying between 0.86–0.89 g/cm3 for all samples. Films with potential applications in food packaging can be obtained from CFKs. However, further researches are necessary to decrease film solubility and increase mechanical resistance.

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Acknowledgments

The authors thank the FINEP/CT-AGRO/FNDCT no 0.1.02-0104.00 for their financial support, which made this study possible. Work of project XI.20 of CYTED.

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Authors and Affiliations

  1. Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Sílvia Maria Martelli, Geovana Rocha Plácido Moore & João Borges Laurindo

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  1. Sílvia Maria Martelli
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  2. Geovana Rocha Plácido Moore
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  3. João Borges Laurindo
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Correspondence to João Borges Laurindo.

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Martelli, S.M., Moore, G.R.P. & Laurindo, J.B. Mechanical Properties, Water Vapor Permeability and Water Affinity of Feather Keratin Films Plasticized with Sorbitol. J Polym Environ 14, 215–222 (2006). https://doi.org/10.1007/s10924-006-0017-4

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  • DOI: https://doi.org/10.1007/s10924-006-0017-4

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