Czech J. Food Sci., 2025, 43(6):438-449 | DOI: 10.17221/24/2025-CJFS

Ginger essential oil-infused pectin-alginate films for extending sliced bread shelf lifeOriginal Paper

Nguyen Hong Khoi Nguyen ORCID...1, Nam Quoc Tran ORCID...1, Thuan Huynh Dinh Nguyen ORCID...2, Quyen Phuong Huynh ORCID...3
1 Faculty of Applied Science and Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
2 Institute of Biotechnology and Food Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam
3 Institute of Applied Sciences, HUTECH University, Ho Chi Minh City, Vietnam

This study examines composite films made from pectin and alginate, enhanced with ginger essential oil (GEO) at 0, 0.5, 1, and 1.5% concentration. The films were analysed for their structure, physical properties, antioxidant and antibacterial activities, and effectiveness in preserving sliced bread over 0, 2, 4, 6, and 8 days. The outcomes presented that incorporating GEO upgraded pectin-alginate films' properties. SEM images revealed increased essential oil distribution on the film surface with higher GEO concentrations, indicating good compatibility. Higher GEO concentrations enhanced the films' abilities to scavenge free radicals DPPH, 2,2-diphenyl-1-picrylhydrazyl; and ABTS, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) and inhibit bacteria (Listeria monocytogenes and Escherichia coli). Furthermore, increasing GEO concentrations in the films helped maintain key quality attributes of sliced bread, such as moisture content, water activity, microbial counts, and firmness. Films with 1.0 and 1.5% GEO concentrations were the most effective in preserving bread, potentially inhibiting mould formation and maintaining sensory properties over the 8-day storage period. This study demonstrates that pectin-alginate films supplemented with GEO at 1 and 1.5% concentration are suitable for storing sliced bread.

Keywords: antioxidant; bread preservation; ginger essential oil; pectin–alginate film; physical properties

Received: February 5, 2025; Revised: August 28, 2025; Accepted: September 22, 2025; Published: December 22, 2025  Show citation

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Nguyen NHK, Tran NQ, Dinh Nguyen TH, Huynh QP. Ginger essential oil-infused pectin-alginate films for extending sliced bread shelf life. Czech J. Food Sci. 2025;43(6):438-449. doi: 10.17221/24/2025-CJFS.
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