Abstract
There have been many studies on the development biodegradable films using starch isolated from various food sources as a substitute for synthetic plastic packaging films. In this study, starch was extracted from ginkgo (Ginkgo biloba) nuts, which were mainly discarded and considered an environment hazard. The prepared starch (GBS) was then used for the preparation of antioxidant films by incorporating various amounts of cinnamon (Cinnamomum zeylanicum) essential oil (CZEO), which provides antioxidant activity. The prepared GBS films with CZEO were characterized by measuring physical, optical, and thermal properties, along with antioxidant activity (ABTS, DPPH, and FRAP) measurements. With the increasing amount of CZEO, the flexibility and antioxidant activities of the GBS films increased proportionally, whereas the tensile strength of the films decreased. The added CZEO also increased the water vapor permeability of the GBS films, and the microstructure of the GBS films was homogeneous overall. Therefore, the obtained results indicate that the developed GBS films containing CZEO are applicable as antioxidant food packaging.
Highlights
The use of synthetic plastic packaging materials, which are not decomposed and have serious impact on environmental pollution, is expected to reach about 1 billion tons by 2021 [1]
This decrease is a common phenomenon owing to the incorporation of essential oils, which causes an increase in the flexibility and a decrease in the rigidity of films [5,20,22]
We developed an alternative food packaging material by using starch extracted from ginkgo nuts
Summary
The use of synthetic plastic packaging materials, which are not decomposed and have serious impact on environmental pollution, is expected to reach about 1 billion tons by 2021 [1]. Starch is abundant in natural polymers, and many studies on starch films for food packaging have been conducted [3,4,5]. Many studies have been conducted on starch films for food packaging, there has been no study on ginkgo nut starch (GBS) films. Ginkgo nuts, which are considered waste and an environmental hazard, were chosen as a novel starch film source in this study. A biodegradable film with antibacterial and antioxidant capabilities was produced by using pectin and cinnamon leaf essential oil [17]. Antioxidant ability was shown in biodegradable films with chitosan and cinnamon leaf essential oil [18]. We prepared GBS films containing CZEO to develop a novel starch film with antioxidant activity, and their physicochemical properties were investigated. The developed GBS films were found to be applicable as an antioxidant packaging film
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