Application of wheat B-starch in biodegradable plastic materials

Evžen Šárka, Zdeněk Kruliš, Jiří Kotek, Lubomír Růžek, Anna Korbářová, Zdeněk Bubník and Michaela Růžková
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Evžen Šárka: Department of Carbohydrate Chemistry and Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
Zdeněk Kruliš: Institute of Macromolecular Chemistry AS CR, Prague, Czech Republic
Jiří Kotek: Institute of Macromolecular Chemistry AS CR, Prague, Czech Republic
Lubomír Růžek: Department of Microbiology, Nutrition and Dietetics, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic
Anna Korbářová: Department of Physics, Faculty of Chemical Engineering, Institute of Chemical Technology in Prague, Prague, Czech Republic
Zdeněk Bubník: Department of Carbohydrate Chemistry and Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
Michaela Růžková: Central Institute for Supervising and Testing in Agriculture, Brno, Czech Republic

Czech Journal of Food Sciences, 2011, vol. 29, issue 3, 232-242

Abstract: Food application of wheat B-starch comprising small starch granules as a result of lower quality is problematic. Accordingly, B-starch or acetylated starch prepared from it, with the degree of substitution (DS) of 1.5-2.3, was used in biodegradable films after blending with poly-(ε-caprolactone) (PCL). The following mechanical characteristics of the produced films were derived from the stress-strain curves: Young modulus, yield stress, stress-at-break, and strain-at-break. Water absorption of PCL/starch (60/40) films was determined according to European standard ISO 62. The measured data were compared with those of commercial A-starch. The films containing native starch degraded in compost totally during 2 months. Acetylation of starch molecules in the composites reduced the degradation rate. Optical microscopy, in combination with the image analysis system NIS-Elements vs. 2.10 completed with an Extended Depth of Focus (EDF) module, was used to study the surface morphology of PCL/starch films after 20-day and 42-day compost incubation. Chemical changes in the compost used for the film exposition were measured.

Keywords: biodegradable plastic; polycaprolactone; B-starch; wheat starch; image analysis; biodegradability (search for similar items in EconPapers)
Date: 2011
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:29:y:2011:i:3:id:292-2010-cjfs

DOI: 10.17221/292/2010-CJFS

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Czech Journal of Food Sciences is currently edited by Ing. Zdeňka Náglová, Ph.D.

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