Physical and mechanical properties of a new edible film made of pea starch and guar gum as affected by glycols, sugars and polyols
Item TypeJournal Article
MetadataShow full item record
The influence of different plasticizers (glycols, sugars and polyols) on the moisture sorption, mechanical, physical, optical, and microstructure characteristics of pea starch-guar gum (PSGG) film was studied. All plasticizers formed homogeneous, transparent, and smooth films, while PEG-400 did not produce film with suitable characteristics. Fourier transform infrared (FTIR) spectroscopy results indicated some interaction between plasticizers and the polymers. Scanning electron microscopy (SEM) observations of the films presented surfaces without cracks, breaks, or openings which were indicator of the miscibility and compatibility of employed plasticizers with PSGG films. The results showed that the films containing plasticizers with higher functional groups had lower equilibrium moisture content at aw < 0.4. In general, a reduction in tensile strength and Young's modulus and an increase in elongation at break were detected when molecular weight of plasticizers and relative humidity increased in all film formulations. Films plasticized with monosaccharide showed similar mechanical properties to those with sorbitol, but lower solubility and water vapour permeability (WVP), higher transparency and moisture content than the sorbitol-plasticized films. The most noticeable plasticization effect was exerted by following order: glycerol > EG > PG > xylitol > fructose > sorbitol > mannitol > galactose > glucose > sucrose > maltitol.
Saberi, B. 2017. Physical and mechanical properties of a new edible film made of pea starch and guar gum as affected by glycols, sugars and polyols. International Journal of Biological Macromolecules. 104(Part A): pp.345-359. doi: 10.1016/j.ijbiomac.2017.06.051
RightsAttribution-NonCommercial-NoDerivatives 4.0 International
This is the accepted manuscript © 2017, Elsevier, which is embargoed until 9th June 2018 to comply with the publisher's self-archiving policy. Published version available from www.elsevier.com
The following license files are associated with this item: