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. 2023 May 4;11(7):4170-4182.
doi: 10.1002/fsn3.3406. eCollection 2023 Jul.

Characterization of active Cerish fructan-sumac extract composite films: Physical, mechanical, and antioxidant properties

Somaye Pakseresht  1 , Jouhaina Hadree  1 , Nasser Sedaghat  1
Affiliations

Characterization of active Cerish fructan-sumac extract composite films: Physical, mechanical, and antioxidant properties

Somaye Pakseresht et al. Food Sci Nutr. .

Abstract

The biodegradable active films have the potential to increase the shelf life and safety of food products. In this study, the properties of Eremurus spectabilis (Cerish) root fructans (ESRF) film and its combination with Rhus coriaria L. (Sumac) extract (RCLE) at different concentrations (1%, 2%, 3%, and 4% w/w) were investigated. The Fourier transform infrared (FTIR) analysis determined the fingerprint region of fructans at 950-1150 cm-1 in all spectrograms. RCLE increased the interactions between the hydroxyl groups and the formation of intermolecular bonds in composite films. Elongation-at-break (EAB) and tensile strength (TS) did not change significantly. However, RCLE increased Young's modulus (YM) (p ˂ .05), thermal stability, and crystallinity of composite films. RCLE also increased the film thickness and decreased the water content, solubility, and swelling degree significantly. RCLE improved the reducing ability and free radical-scavenging activity of composite films. Present results indicated that the ESRF/RCLE films were the protective barriers to the permeability of water vapor. The incorporation of RCLE increased the surface hydrophobicity and caused the composite film microstructure to become uniform and more compact. Overall, the Sumac extract at the specific concentration of 3% can be used to improve the Cerish fructans film properties and extend the product's shelf life in active food packaging.

Keywords: DPPH; DSC; Eremurus spectabilis; Rhus coriaria L.; XRD; reducing power activity.

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Conflict of interest statement

The authors declare that they do not have any conflict of interest.

Figures

FIGURE 1
FIGURE 1
Fourier transform infrared (FTIR) spectra of Eremurus spectabilis root fructans (ESRF) and ESRF/Rhus coriaria L. extract (RCLE) films. The right numbers show the RCLE concentration.
FIGURE 2
FIGURE 2
X‐ray diffraction patterns of Eremurus spectabilis root fructans (ESRF) and ESRF/Rhus coriaria L. extract (RCLE) films. The right numbers show the RCLE concentration.
FIGURE 3
FIGURE 3
The microstructure of upper surface of Eremurus spectabilis Root fructans (ESRF) film (A1, A2), and ESRF/Rhus coriaria L. extract (RCLE) films at 1% (B1, B2) 2% (C1, C2), 3% (D1, D2) 4% (E1, E2) of RCLE concentrations and 3000× (A1, B1, C1, D1, and E1) and 5000× (A2, B2, C2, D2, and E2) magnifications.
FIGURE 4
FIGURE 4
The microstructure of cryo‐fractured cross‐section of Eremurus spectabilis Root fructans (ESRF) film (A1, A2) and ESRF/Rhus coriaria L. extract (RCLE) films at 1% (B1, B2), 2% (C1, C2), 3% (D1, D2), 4% (E1, E2) of RCLE and 3000× (A1, B1, C1, D1, and E1) and 5000× (A2, B2, C2, D2, and E2) magnifications.
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