Preparation, characterization and antioxidant properties of gelatin films incorporated with Origanum onites L. essential
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ORIGINAL PAPER
Preparation, characterization and antioxidant properties of gelatin films incorporated with Origanum onites L. essential oil Dilara Kilinc1 · Bugra Ocak2 · Özgül Özdestan‑Ocak1 Received: 12 August 2020 / Accepted: 28 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This study aims to develop gelatin (GEL) films containing 0, 2, 4, 6, and 8% Origanum onites L. essential oil (OOEO) with glycerol as plasticizer using the casting technique. The physical, color, mechanical, structural, thermal, and antioxidant properties of enriched GEL films were also characterized. The GEL/OOEO combination significantly reduced tensile strength and film solubility of GEL-based films while significantly increasing ultraviolet and visible light barrier properties, thickness, and elongation at break (p ≤ 0.05). According to the results, the increased OOEO content has become darker yellow compared to the control GEL film. The amount of compounds in OOEO was determined using gas chromatography coupled with mass spectrometry, and it was determined that the most representative compounds of OOEO were carvacrol and thymol. As OOEO concentration increases, the decrease in the smooth, continuous surfaces and dense internal structures of GEL/OOEO films are observed with scanning electron microscopy. FTIR analysis showed some changes in the density of typical bands of control GEL and GEL/OOEO films. Analysis of thermal properties was determined by DSC, and films containing OOEO showed two different endothermic peaks at a lower temperature than control films. The antioxidant properties were significantly enhanced with increasing OOEO concentration reaching 21.78 and 46.52% of DPPH and 52.16 and 83.13% of ABTS radical inhibition, respectively. Therefore, GEL/OOEO films may be suitable for use as an environmentally friendly active film due to their excellent antioxidant properties with sufficient functional properties, depending on the desired application. Keywords Gelatin · Biodegradable · Packaging · Carvacrol · Thymol
Introduction Today, in addition to extending the shelf life of foods, one of the most effective ways to meet the consumer demand for safe and minimally processed food products is the development of modern active packaging films containing essential oils [1, 2]. Active packaging film can be defined as an innovative packaging system that can prevent unwanted biological or chemical changes and protect or prolong the shelf life of foods by interacting with food, the environment, or both while maintaining the nutritional quality and safety of foods during storage [3, 4]. Packaging systems to be used in the food industry are expected to reduce environmental effects, * Bugra Ocak [email protected] 1
Department of Food Engineering, Faculty of Engineering, Ege University, Bornova, 35100 Izmir, Turkey
Department of Leather Engineering, Faculty of Engineering, Ege University, Bornova, 35100 Izmir, Turkey
2
preferably from the use of petroleum-based polymers, and have f
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