Physical and mechanical properties of biodegradable edible film obtained from Salep

In this study the feasibility of using salep as a new film-forming material was studied. The mechanical properties، water vapor permeability and thickness of salep films incorporated with glycerol were determined. Increasing the content of dry material of salep from 1% to 3% (w/v) increased values for tensile strength and elongation at break from 16. 16% and 18. 85 MPa to 70. 15% and 24. 50 MPa respectively. Also values for water vapor permeability، decreased and then increased. Surface and dorsal of Salep edible films studied by Scanning Electron Microscopy to explain structure properties. This study revealed that the salep had a good potential to be used in producing edible films with interesting specifications.