Czech J. Food Sci., 2011, 29(3):232-242 | DOI: 10.17221/292/2010-CJFS

Application of wheat B-starch in biodegradable plastic materials

Evžen Šárka1, Zdeněk Kruliš2, Jiří Kotek2, Lubomír Růžek3, Anna Korbářová4, Zdeněk Bubník1, Michaela Růžková5
1 Department of Carbohydrate Chemistry and Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
2 Institute of Macromolecular Chemistry AS CR, Prague, Czech Republic
3 Department of Microbiology, Nutrition and Dietetics, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic
4 Department of Physics, Faculty of Chemical Engineering, Institute of Chemical Technology in Prague, Prague, Czech Republic
5 Central Institute for Supervising and Testing in Agriculture, Brno, Czech Republic

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

Published: June 30, 2011  Show citation

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Šárka E, Kruliš Z, Kotek J, Růžek L, Korbářová A, Bubník Z, Růžková M. Application of wheat B-starch in biodegradable plastic materials. Czech J. Food Sci. 2011;29(3):232-242. doi: 10.17221/292/2010-CJFS.
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