Abstract
In this study, barnyard millet starch (BMS) was used to prepare edible films. Antioxidant activity was conferred to the BMS film by incorporating borage seed oil (BO). The physical, optical, and thermal properties as well as antioxidant activities of the films were evaluated. The incorporation of BO into the BMS films decreased the tensile strength from 9.46 to 4.69 MPa and increased the elongation at break of the films from 82.49% to 103.87%. Water vapor permeability, water solubility, and moisture content of the BMS films decreased with increasing BO concentration, whereas Hunter b value and opacity increased, L and a values of the films decreased. The BMS films containing BO exhibited antioxidant activity that increased proportionally with increased BO concentration. In particular, the BMS film with 1.0% BO exhibited the highest antioxidant activity and light barrier properties among the BMS films. Therefore, the BMS films with added BO can be used as an antioxidant packaging material.
Highlights
Biodegradable films have been applied in food packaging to resolve problems related to environmental impact [1]
The barnyard millet starch (BMS) films with added borage seed oil (BO) can be used as an antioxidant packaging material
Among bio-materials used for films, starch is popular in edible film production because of its widespread distribution in nature, ease of isolation, and low cost [2]
Summary
Biodegradable films have been applied in food packaging to resolve problems related to environmental impact [1]. Among bio-materials used for films, starch is popular in edible film production because of its widespread distribution in nature, ease of isolation, and low cost [2]. Recent studies have been conducted to improve the functional properties of starch films, such as antimicrobial, antioxidant activities, and light barrier properties [3]. Economic and environmental benefits from utilizing agricultural byproducts or underutilized natural materials for film preparation have attracted attention for edible film production [4,5]. Barnyard millet is a cereal cultivated in Asian countries for human food or animal feed [6].
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