Properties of Chitosan Films as a Function of pH and Solvent Type

Authors

  • Ki Myong Kim,

    1. Authors K.M. Kim, Son, and S.-K. Kim are with Dept. of Biotechnology & Bioengineering, Pukyong Natl. Univ., Busan 608-737, Korea. Authors Weller and Hanna are with Industrial Agricultural Products Center, Univ. of Nebraska, 208 LW Chase Hall Lincoln, NE 68783-0730. Direct inquiries to author Hanna (E-mail: mhanna1@unl.edu).
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  • Jeong Hwa Son,

    1. Authors K.M. Kim, Son, and S.-K. Kim are with Dept. of Biotechnology & Bioengineering, Pukyong Natl. Univ., Busan 608-737, Korea. Authors Weller and Hanna are with Industrial Agricultural Products Center, Univ. of Nebraska, 208 LW Chase Hall Lincoln, NE 68783-0730. Direct inquiries to author Hanna (E-mail: mhanna1@unl.edu).
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  • Sung-Koo Kim,

    1. Authors K.M. Kim, Son, and S.-K. Kim are with Dept. of Biotechnology & Bioengineering, Pukyong Natl. Univ., Busan 608-737, Korea. Authors Weller and Hanna are with Industrial Agricultural Products Center, Univ. of Nebraska, 208 LW Chase Hall Lincoln, NE 68783-0730. Direct inquiries to author Hanna (E-mail: mhanna1@unl.edu).
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  • Curtis L. Weller,

    1. Authors K.M. Kim, Son, and S.-K. Kim are with Dept. of Biotechnology & Bioengineering, Pukyong Natl. Univ., Busan 608-737, Korea. Authors Weller and Hanna are with Industrial Agricultural Products Center, Univ. of Nebraska, 208 LW Chase Hall Lincoln, NE 68783-0730. Direct inquiries to author Hanna (E-mail: mhanna1@unl.edu).
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  • Milford A. Hanna

    1. Authors K.M. Kim, Son, and S.-K. Kim are with Dept. of Biotechnology & Bioengineering, Pukyong Natl. Univ., Busan 608-737, Korea. Authors Weller and Hanna are with Industrial Agricultural Products Center, Univ. of Nebraska, 208 LW Chase Hall Lincoln, NE 68783-0730. Direct inquiries to author Hanna (E-mail: mhanna1@unl.edu).
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Abstract

ABSTRACT: Two different deacetylated chitosans were dissolved in formic, acetic, lactic, or propionic acid to prepare chitosan films. The pH values of the film-forming solutions were adjusted to 3, 4, and 5. Water vapor permeability (WVP), tensile strength (TS), elongation (E), and total soluble matter (TSM) were significantly (P < 0.05) affected by acid type, pH, and degree of deacetylation (DA). Low DA (LDA) chitosan films had lower WVP and TSM, higher TS compared with high DA (HDA) chitosan films. The E values were not affected by DA. As pH increased, WVP and TSM of chitosan films tended to increase while TS decreased significantly (P < 0.05). Chitosan films with acetic and propionic acid solvents had low WVP and TSM and high TS, while films with lactic acid solvent had high E and TSM and the lowest TS. Fourier-transform infrared showed peak shifting in the spectra with different solvents and at different pH values. Chitosan films with lactic acid solvent showed a peak shift to a lower frequency range. The NH3+ band was absent in the pH 5.0 chitosan film spectra.

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