Effects of modified sweet potato starch edible coating incorporated with cumin essential oil on storage quality of ‘early crisp’

The purpose of this study is to reveal the mechanism of preparing high quality modified starch by ultrasonic technology. In this paper, ultrasonic modified starch and octenyl succinic anhydride modified starch with low degree of substitution were prepared under ultrasonic conditions, using sweet potato starch as raw material. The effects of ultrasound on the structure and properties of native sweet potato starch were studied to see whether ultrasound could produce mechanochemical effect on starch. Then the mechanism of ultrasonic effect on quality of octenyl succinic anhydride modified starch was studied by mechanochemical effect. The results showed that after ultrasonic treatment for 1 min, the crystallinity decreased from 37.6 to 33.8% and reaction efficiency increased from 49.43 to 54.39%, while after ultrasonic treatments for 8 and 32–60 min had different changes. These changes showed that ultrasonic treatment produced significant mechanochemical effect on native sweet potato starch. Ultrasound significantly improved the quality of octenyl succinic anhydride modified starch, and its influence mechanism was revealed using the theory of mechanochemistry. This study provides a feasible method for the research of high quality modified starch and lays a theoretical foundation for expanding the application of ultrasound in various fields.

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Mechanical Properties and Antioxidant Activity of Sweet Potato Starch Film Incorporated with Lemongrass Oil

Advances in Agricultural and Food Research Journal ◽

10.36877/aafrj.a0000137 ◽

2020 ◽

Vol 1 (2) ◽

Author(s):

Roseliza Kadir Basha ◽

Nor Faezah Abuhan ◽

Siti Hajar Othman ◽

Noor Zafira Noor Hasnan ◽

Rashidah Sukor ◽

...

Keyword(s):

Mechanical Properties ◽

Antioxidant Activity ◽

Essential Oil ◽

Sweet Potato ◽

Potato Starch ◽

Testing Machine ◽

Lemongrass Oil ◽

Oil Concentration ◽

Sweet Potato Starch ◽

The Stability

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 0.1±0.01 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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