Application of wheat B-starch in biodegradable plastic materials
2011
Sarka, E.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Technologie Sacharidu | Krulis, Z.,Akademie Ved, Prague (Czech Republic). Ustav Makromolekularni Chemie | Kotek, J.,Akademie Ved, Prague (Czech Republic). Ustav Makromolekularni Chemie | Ruzek, L.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Mikrobiologie, Vyzivy a Dietetiky | Korbarova, A.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Fyziky a Merici Techniky | Bubnik, Z.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Technologie Sacharidu | Ruzkova, M.,Ustredni Kontrolni a Zkusebni Ustav Zemedelsky, 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-(eta-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 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 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.
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