Physical and mechanical properties of durum wheat (Triticum durum) starch films prepared with A- and B-type granules

Beatriz Montaño-Leyva, Patricia Torres-Cháwez*, Benjamín Ramírez-Wong, Maribel Plascenela-Jatemea, Francisco Brown-Bojórquez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The use of starch for the production of biodegradable materials has been increasing. Wheat is an important source, however, durum wheat starch and its separated granular components had not been evaluated for this purpose. The aim of this study was to evaluate the physical and mechanical properties of durum wheat starch films when prepared with a distribution of different granular-sized starches (A- and B-type). Starch was isolated, and the A and B populations of granules were separated. Films were prepared by casting. Glycerol (G) was used as a plasticizer in concentrations of 25% and 40%, respectively. Starch films were evaluated using scanning electron microscopy (SEM), mechanical properties (tensile strength, TS, elongation at break, E, elastic modulus, EM), solubility, and X-ray diffraction (XRD). Durum wheat starch films were transparent, flexible, and, according to SEM, highly homogeneous. Films prepared with 25% G showed brittle material behavior (TS = 42-50 MPa, E = 1.4-2.7%, and EM = 31-34 MPa), whereas those prepared with 40% G had ductile material characteristics (TS = 11-17 MPa, E = 4-41%, and EM = 4-11.3 MPa). These mechanical properties of the films were significantly affected by the glycerol concentration and the starch granule type used. The film solubility was low when compared to those reported in other studies. It increased with increasing plasticizer concentration. According to the XRD, the films showed a semi-crystalline structure.

Original languageEnglish
Pages (from-to)559-567
Number of pages9
Issue number10
StatePublished - Oct 2008


  • Durum wheat
  • Ghosts
  • Granule size
  • Mechanical properties
  • Starch films
  • Wheat starch


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