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Open AccessArticle

Cross-Linked Amylose Bio-Plastic: A Transgenic-Based Compostable Plastic Alternative

Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg, Denmark
Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
Department of Chemical Science, University of Naples, 80126 Napoli, Italy
Department of Food Science, University of Copenhagen, 1958 Frederiksberg, Denmark
Department of Molecular Biology and Genetics, Aarhus University, 4200 Slagelse, Denmark
College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029, China
Center for Bioresources and Biorefinery, Danish Technological Institute, Gregersenvej 7, 2630 Taatsrup, Denmark
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2017, 18(10), 2075;
Received: 1 September 2017 / Revised: 20 September 2017 / Accepted: 25 September 2017 / Published: 30 September 2017
(This article belongs to the Special Issue Advanced Biomaterials for Food Edible Coatings)
Bio-plastics and bio-materials are composed of natural or biomass derived polymers, offering solutions to solve immediate environmental issues. Polysaccharide-based bio-plastics represent important alternatives to conventional plastic because of their intrinsic biodegradable nature. Amylose-only (AO), an engineered barley starch with 99% amylose, was tested to produce cross-linked all-natural bioplastic using normal barley starch as a control. Glycerol was used as plasticizer and citrate cross-linking was used to improve the mechanical properties of cross-linked AO starch extrudates. Extrusion converted the control starch from A-type to Vh- and B-type crystals, showing a complete melting of the starch crystals in the raw starch granules. The cross-linked AO and control starch specimens displayed an additional wide-angle diffraction reflection. Phospholipids complexed with Vh-type single helices constituted an integrated part of the AO starch specimens. Gas permeability tests of selected starch-based prototypes demonstrated properties comparable to that of commercial Mater-Bi© plastic. The cross-linked AO prototypes had composting characteristics not different from the control, indicating that the modified starch behaves the same as normal starch. The data shows the feasibility of producing all-natural bioplastic using designer starch as raw material. View Full-Text
Keywords: starch; amylose; bioplastic; cross-linker; amylose permeability; cross-link assay; citric acid starch; amylose; bioplastic; cross-linker; amylose permeability; cross-link assay; citric acid
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Sagnelli, D.; Hooshmand, K.; Kemmer, G.C.; Kirkensgaard, J.J.K.; Mortensen, K.; Giosafatto, C.V.L.; Holse, M.; Hebelstrup, K.H.; Bao, J.; Stelte, W.; Bjerre, A.-B.; Blennow, A. Cross-Linked Amylose Bio-Plastic: A Transgenic-Based Compostable Plastic Alternative. Int. J. Mol. Sci. 2017, 18, 2075.

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