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Issue 101, 2015
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Soy protein isolate-based films cross-linked by epoxidized soybean oil

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Abstract

Epoxidized soybean oil (ESO) is an environmentally friendly cross-linking agent derived from soybean, having multiple epoxy groups in its molecules. It can effectively improve tensile strength and water resistance of soy protein isolate (SPI)-based films. The properties of the SPI-based films were characterized by X-ray diffraction and attenuated total reflectance Fourier transform infrared spectroscopy. The best performance of the SPI-based films was achieved when the ESO addition was 2.5%, for which tensile modulus, tensile strength and 10% offset yield strength were increased to 265.0 MPa, 9.8 MPa and 6.8 MPa, respectively. Compared to untreated SPI-based films, these were increases of 695.6%, 139.8%, and 246.6%, respectively. However, the elongation at break was decreased by 67.6% due to the cross-linking between SPI and ESO. The SPI-based film modified by 5% ESO had the best water-resistance property and reduced the 24 hour water absorption from 209.1% to 45.9%, which was a significant decrease of 78.1%.

Graphical abstract: Soy protein isolate-based films cross-linked by epoxidized soybean oil

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Publication details

The article was received on 04 Aug 2015, accepted on 15 Sep 2015 and first published on 15 Sep 2015


Article type: Paper
DOI: 10.1039/C5RA15590H
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Citation: RSC Adv., 2015,5, 82765-82771

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    Soy protein isolate-based films cross-linked by epoxidized soybean oil

    C. Xia, L. Wang, Y. Dong, S. Zhang, S. Q. Shi, L. Cai and J. Li, RSC Adv., 2015, 5, 82765
    DOI: 10.1039/C5RA15590H

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