Mechanical properties and antioxidant activity of sweet potato starch film incorporated with lemongrass oil

Siti Hajar Othman, . and Nor Faezah Abuhan, . and Rashidah Sukor, . and Nazatul Shima Azmi, . and Roseliza Kadir Basha, . and Nor Amaiza Mohd Amin, . and Noor Zafira Noor Hasnan, . and Zanariah Mohd Dom, . Mechanical properties and antioxidant activity of sweet potato starch film incorporated with lemongrass oil. pp. 1-10. ISSN 2735-1084

This study was carried out to investigate the mechanical properties and antioxidant activity of starch-based film containing essential oil. Active antioxidant films have been prepared with sweet potato starch by incorporating lemongrass oil. Sorbitol with different concentration levels (10-50 w/w dry starch basis) has been used as a plasticiser. The process begins with the extraction of sweet potato starch into powder followed by the process of gelatinisation of starch mixing the solution with plasticiser and incorporation of lemongrass oil before casting. Analysis on the mechanical properties using a universal testing machine and antioxidant activity using 2 2-diphenyl-1-picrylhydrazyl (DPPH) assay were carried out. The film with thickness of 0.10.01 mm showed tensile strength (TS) and elongation at break at (EAB) 69.22-307.16 MPa and 5.39-57.72 respectively. The increasing concentration of lemongrass oil resulted in a significant increase in EAB but reduction in TS. The antioxidant activity of the lemongrass oil in starch-based film was 29-43 and increased with the increase of lemongrass oil concentration. Thus the incorporation of essential oil in the starch-based film was found to be directly affected by the mechanical properties and the antioxidant activity related to the stability shelf life and application of the film on the packaging area.

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Abstract

This study was carried out to investigate the mechanical properties and antioxidant activity of starch-based film containing essential oil. Active antioxidant films have been prepared with sweet potato starch by incorporating lemongrass oil. Sorbitol with different concentration levels (10-50 w/w dry starch basis) has been used as a plasticiser. The process begins with the extraction of sweet potato starch into powder followed by the process of gelatinisation of starch mixing the solution with plasticiser and incorporation of lemongrass oil before casting. Analysis on the mechanical properties using a universal testing machine and antioxidant activity using 2 2-diphenyl-1-picrylhydrazyl (DPPH) assay were carried out. The film with thickness of 0.10.01 mm showed tensile strength (TS) and elongation at break at (EAB) 69.22-307.16 MPa and 5.39-57.72 respectively. The increasing concentration of lemongrass oil resulted in a significant increase in EAB but reduction in TS. The antioxidant activity of the lemongrass oil in starch-based film was 29-43 and increased with the increase of lemongrass oil concentration. Thus the incorporation of essential oil in the starch-based film was found to be directly affected by the mechanical properties and the antioxidant activity related to the stability shelf life and application of the film on the packaging area.

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Item Type:	Article
AGROVOC Term:	sorbitol
AGROVOC Term:	tensile strength
AGROVOC Term:	antioxidant properties
AGROVOC Term:	packaging
AGROVOC Term:	food packaging
AGROVOC Term:	extended shelf life
Geographical Term:	Malaysia
Depositing User:	Mr. AFANDI ABDUL MALEK
Date Deposited:	06 Mar 2026 00:48
Last Modified:	06 Mar 2026 00:48
URI:	http://webagris.upm.edu.my/id/eprint/9693

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