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

Asgar Farahnaky, Bahareh Saberi, Mahsa Majzoobi

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)176-186
Number of pages11
JournalJournal of Texture Studies
Volume44
Issue number3
Early online dateJan 2013
DOIs
Publication statusPublished - Jun 2013

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