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Effects of chemical modification on the structure and mechanical properties of starch-based biofilms

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Abstract

In this work, chemically modified corn starch and plasticized corn starch biofilms were obtained and characterized in four steps: (1) preparation of corn starch microparticles, (2) preparation of malic acid-modified corn starch microparticles (MA–SM), (3) preparation of corn starch biofilms and MA–SM-plasticized corn starch biofilms, and (4) characterization of the biofilms. The effects of MA–SM concentration (4, 8, and 12% based on the amount of corn starch) on the structural characteristics and mechanical properties of the biofilms were investigated. Changes in the starch granules after chemical modification were studied by X-ray diffraction, FT-IR spectroscopy, and scanning electron microscopy. The presence of ester carbonyl group stretching vibration at 1,720 cm−1 in FT-IR spectra was evidence of reaction of the starch microparticles with malic acid. The tensile yield strength and Young’s modulus of the films increased with increasing MA–SM content. Water uptake decreased from 69.8% for biofilm without MA–SM to 52.7% for biofilm with MA–SM. The improvement of these properties in the plasticized product could be attributed to the good interaction between the MA–SM filler and the corn starch.

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Authors and Affiliations

  1. Department of Natural Polymers, “Petru Poni” Institute of Macromolecular Chemistry, 41A Gr. Ghica-Voda Alley, 700487, Iasi, Romania

    Ruxanda Bodîrlău, Carmen-Alice Teacă, Iuliana Spiridon & Niţă Tudorachi

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  1. Ruxanda Bodîrlău
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  2. Carmen-Alice Teacă
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  3. Iuliana Spiridon
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  4. Niţă Tudorachi
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Correspondence to Ruxanda Bodîrlău.

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Bodîrlău, R., Teacă, CA., Spiridon, I. et al. Effects of chemical modification on the structure and mechanical properties of starch-based biofilms. Monatsh Chem 143, 335–343 (2012). https://doi.org/10.1007/s00706-011-0659-3

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  • DOI: https://doi.org/10.1007/s00706-011-0659-3

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