Effect of glycerol on physical and mechanical properties of wheat starch edible films

Farahnaky, A, Saberi, B and Majzoobi, M 2013, 'Effect of glycerol on physical and mechanical properties of wheat starch edible films', Journal of Texture Studies, vol. 44, no. 3, pp. 176-186.


Document type: Journal Article
Collection: Journal Articles

Title Effect of glycerol on physical and mechanical properties of wheat starch edible films
Author(s) Farahnaky, A
Saberi, B
Majzoobi, M
Year 2013
Journal name Journal of Texture Studies
Volume number 44
Issue number 3
Start page 176
End page 186
Total pages 11
Publisher Wiley-Blackwell Publishing
Abstract In this research, edible films were produced using native wheat starch with different concentrations of glycerol (0, 20, 30, 40 and 50% of starch dry weight basis). Starch films were prepared by casting after gelatinization. The effects of glycerol on the microstructure, crystallinity, solubility in water, moisture absorption, water vapor permeability, optical and mechanical properties of the films at 25C and relative humidity range of 11-84% were investigated. The increase of glycerol content led to increase in film solubility, lightness, more compact structures and water absorption at 25C. The lowest water vapor permeabilities were found for the films with 20 and 30% glycerol. Glycerol did not change X-ray patterns of starch films; however, the degree of crystallinity reduced. In general, for all starch films stress at break and Young's modulus decreased and elongation increased when glycerol concentration and/or RH increased.
Subject Food Processing
Keyword(s) Edible film
Glycerol
Mechanical properties
Water vapor permeability
Wheat starch
DOI - identifier 10.1111/jtxs.12007
Copyright notice © 2013 Wiley Periodicals
ISSN 0022-4901
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