Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 50, Issue -, Pages 104-111Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2013.06.028
Keywords
Citric acid; Starch; Wheat flour; Poly(lactic acid); Extrusion; Barrier properties; Sorption isotherms
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Funding
- FUI (Fonds Unique Interministeriels)
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The effects of citric acid on wheat flour/glycerol/poly(lactic) acid (PLA) blends prepared by one-step twin-screw extrusion have been studied to improve barrier properties of starch based materials. A series of injected samples were produced from prepared compounds with varying ratio (0-20 part) of citric acid. The effects of citric acid on the water vapor permeability, oxygen permeability and water solubility in the film were then investigated. The barrier properties results proved that citric acid behaves as compatibilizing agent between starch and PLA phases for ratios between 0 and 10 parts. When the added amount exceeds 10 parts, CA acted as a plasticizer and/or promoted the hydrolysis of the starch glycosidic bonds. (C) 2013 Elsevier B.V. All rights reserved.
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