Characterization of <i>Ecklonia cava</i> Alginate Films Containing Cinnamon Essential Oils

다국어 초록 (Multilingual Abstract)

<P>In this study, <I>Ecklonia cava</I> alginate (ECA) was used as a base material for biodegradable films. Calcium chloride (CaCl<SUB>2</SUB>) was used as a cross-linking agent, and various concentrations (0%, 0.4%, 0.7%, and 1.0%) of cinnamon leaf oil (CLO) or cinnamon bark oil (CBO) were incorporated to prepare active films. The ECA film containing 3% CaCl<SUB>2</SUB> had a tensile strength (TS) of 17.82 MPa and an elongation at break (E) of 10.36%, which were higher than those of the film without CaCl<SUB>2</SUB>. As the content of essential oils (EOs) increased, TS decreased and E increased. Addition of CLO or CBO also provided antioxidant and antimicrobial activities to the ECA films. The antioxidant activity of the ECA film with CBO was higher than that of the film containing CLO. In particular, the scavenging activities of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals in the ECA film containing 1% CBO were 50.45% and 99.37%, respectively. In contrast, the antimicrobial activities against <I>Escherichia coli</I> O157:H7, <I>Salmonella</I> Typhimurium, <I>Staphylococcus aureus</I>, and <I>Listeria monocytogenes</I> were superior in the ECA films with CLO. These results suggest that ECA films containing CLO or CBO can be applied as new active packaging materials.</P>