Volume 17, Issue 102 (2020)                   FSCT 2020, 17(102): 145-160 | Back to browse issues page

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1- Department of Food Science & Technology, Bam Branch, Islamic Azad University, Bam, Iran
2- Department of Food Science & Technology, Bam Branch, Islamic Azad University, Bam, Iran , sarhadi@iaubam.ac.ir
Abstract:   (2189 Views)
Nowadays, extensive investigations have been conducted on developing novel biopolymers from biodegradable sources. In the current study, the active packaging film based on sago starch-containing varying concentrations (1, 1.5 and 2 MIC) of Withania Somnifera L. extract were produced. The Minimal Inhibitory Concentration (MIC) and Minimal Bactericide Concentration (MBC) of extract were measured. Physicochemical (such as thickness, water absorption capacity (WAC), water solubility (WS), water vapor permeability, Oxygen Permeability (OP) and contact angle (CA)), mechanical (tensile strength, elongation to break and modulus of elasticity) and antioxidant properties of the films were evaluated. The antibacterial activity of the films also was tested against two common food-borne pathogens (Escherichia coli, and Staphylococcus aureus) by the disc diffusion method. The results showed that increasing concentrations of Withania Somnifera L. extract have a significant effect (p <0.05) to increase the amount of thickness, WS, water vapor permeability, OP, and CA, but was not effective on WAC. Withania Somnifera L. extract increased the absorption of color in the visible region, which in turn led to an increasing of the parameters a* (index color tends toward green) and b* (index color tends towards yellow) but reduced L*. An increase in Withania Somnifera L. extract content resulted in a plasticizing effect, reducing the tensile strength and Young’s modulus but a concurrent increase in elongation at break. Sago films containing higher percentages of Withania Somnifera L. extract were effective against all two tested bacterial strains, and these effects were more significant in the case of the gram-positive bacteria. Sago film containing extract showed a good DPPH radical scavenging activity. These results suggest that the developed sago films containing Withania Somnifera L. extract could be used in various food packaging applications.
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Article Type: Original Research | Subject: Packing and all types of coatings in the food industry
Received: 2020/03/12 | Accepted: 2020/05/2 | Published: 2020/07/31

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