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Preparation and characterization of a new edible film based on Persian gum with glycerol plasticizer

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Abstract

A new type of biodegradable film was formulated and characterized when based on the water-soluble-phase of Persian gum (SPG). The edible film was formulated optimally by using different concentrations of SPG (2.0, 2.5, 3.0, 3.5 and 4%) and glycerol as plasticizer (25, 35, and 35% based on dried SPG). Further examinations involved evaluating the manufactured films in terms of the barrier and physical properties, mechanical qualities, optical indices, microstructural properties and Fourier transform. The results showed that the increase in SPG and plasticizer content caused increases in thickness, moisture uptake, water vapor permeability and density of films (p < 0.05). Water solubility increased in response to higher concentrations of glycerol but decreased by higher amounts of dry matter (p < 0.05). The highest levels of the tensile strength (59.95%) and elongation at break (40.3 MPa) were obtained by SPG (3.5%) + 35% glycerol treatment. The L*, a* and opacity values decreased, while there was an increase in the b* value, as a result of increasing the plasticizer content (p < 0.05). A reduction occurred in the L* value of films, while the a* and b* values increased when using higher amounts of dry matter (p < 0.05). By analyzing the samples with field emission scanning electron microscopy, no cracks were observed on films when the contents of glycerol and dry matter were higher than 30% and 2.5%, respectively. The findings demonstrated that creating edible films from SPG can be an effective approach to the production of edible films.

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Authors and Affiliations

  1. Food Science and Technology Department, Faculty of Agriculture, University of Zabol, Bonjar Ave, Zabol, 98615-538, Islamic Republic of Iran

    Elahe Saravani Pak & Mohammad Ali Najafi

  2. Plant Physiology Department, Faculty of Agriculture, University of Zabol, Bonjar Ave, Zabol, Islamic Republic of Iran

    Sara Najafi Ghaghelestani

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  1. Elahe Saravani Pak
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  2. Sara Najafi Ghaghelestani
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  3. Mohammad Ali Najafi
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Correspondence to Mohammad Ali Najafi.

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Pak, E.S., Ghaghelestani, S.N. & Najafi, M.A. Preparation and characterization of a new edible film based on Persian gum with glycerol plasticizer. J Food Sci Technol 57, 3284–3294 (2020). https://doi.org/10.1007/s13197-020-04361-1

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  • DOI: https://doi.org/10.1007/s13197-020-04361-1

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