Effect of java citronella essential oil addition on the physicochemical properties of Gelidium corneum -chitosan composi
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Effect of java citronella essential oil addition on the physicochemical properties of Gelidium corneum-chitosan composite films Eun-Jeong Go1 • Kyung Bin Song1
Received: 22 September 2019 / Revised: 28 January 2020 / Accepted: 7 February 2020 Ó The Korean Society of Food Science and Technology 2020
Abstract A new composite film was developed by combining Gelidium corneum (GC) with chitosan to enhance the physicochemical characteristics of GC film. In addition, to confer new functional property on the GC-chitosan composite film, various amounts (0.5%, 1.0%, and 1.5%) of java citronella essential oil (JCEO) were incorporated into the film. As the concentration of JCEO increased, the extensibility of the GC-chitosan film improved. In addition, the film became more opaque due to decreased light transmission. Especially, ultraviolet light was completely blocked in the composite films containing JCEO. Radical scavenging activities of the films also increased with increasing JCEO content, indicating that the films have antioxidant activity. Therefore, GC-chitosan composite film containing JCEO is applicable in food packaging to preserve food quality by retarding lipid oxidation. Keywords Antioxidant activity Chitosan Composite film Gelidium corneum Java citronella essential oil
Introduction Eco-friendly packaging materials have been extensively studied as a replacement for synthetic plastic packaging materials to prevent environmental pollution (Andretta et al., 2019). To develop environment friendly packaging & Kyung Bin Song [email protected] Eun-Jeong Go [email protected] 1
Department of Food Science and Technology, Chungnam National University, Daejeon 34134, Republic of Korea
films, polysaccharides as a biodegradable polymer have been used as a film base material (Ortega et al., 2014). Gelidium corneum (GC) is a red alga that consists of a large amount of agar, and there have been a few studies conducted on the properties of its film (Hong et al., 2009; Jang et al., 2011; Ku et al., 2008; Lim et al., 2010a; 2010b). GC films have been known to have poor mechanical properties (Lim et al., 2010a; 2010b). Ku et al. (2008) reported that the tensile strength (TS) value of GC extract film prepared from GC bleached with chlorine dioxide and treated with ozone gas was 2.32 MPa. It was also reported that films prepared with whole GC including pulp fraction had better mechanical properties than GC extract films (Jang et al., 2011; Lim et al., 2010a). In addition, GC films blended with other proteins have improved rigidity, and the TS value was increased to 6.23 MPa after blending with gelatin (Hong et al., 2009) Thus, the mechanical properties of GC film can be enhanced by combining them with other biopolymers to develop composite films. Chitosan, a deacetylated chitin, is an abundant and biodegradable material with a good film-forming ability. In particular, chitosan films have good mechanical properties (Martı´nez Camacho et al., 2010). Chitosan can also hold aromatic compounds because it forms hydrogen bonds wi
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