Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 33, Issue 1, Pages 229-235Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2010.10.016
Keywords
Corn starch; Citric acid; Carboxymethyl cellulose; WVP; Tensile properties
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The films produced from pure starch are brittle and difficult to handle. Chemical modifications (e.g. crosslinking) and using a second biopolymer in the starch based composite have been studied as strategies to produce low water sensitive and relatively high strength starch based materials. A series of corn starch films with varying concentrations (0-20%, W/W) of citric acid (CA) and carboxymethyl cellulose (CMC) were produced by casting method. The effects of CA and CMC on the water vapor permeability (WVP), moisture absorption, solubility and tensile properties were investigated. The water vapor barrier property and the ultimate tensile strength (UTS) were improved significantly (p < 0.05) as the CA percentage increased from 0 to 10% (W/W). At the level of 15% (W/W) CMC, the starch films showed the lowest WVP values (2.34 x 10(-7) g Pa-1 h(-1) m(-1)) and UTS increased from 6.57 MPa for the film without CMC to 16.11 MPa for that containing 20% CMC. (C) 2010 Elsevier B.V. All rights reserved.
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