Department of Food Science and Technology, Chungnam National University, Daejeon 34134, Korea.
Int J Mol Sci. 2018 Nov 10;19(11):3545. doi: 10.3390/ijms19113545.
In this study, alginate (ECA) was used as a base material for biodegradable films. Calcium chloride (CaCl₂) 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% CaCl₂ 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 CaCl₂. 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 O157:H7, Typhimurium, , and 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.
在这项研究中，海藻酸钠（ECA）被用作可生物降解薄膜的基础材料。氯化钙（CaCl₂）用作交联剂，并用不同浓度（0％，0.4％，0.7％和 1.0％）的肉桂叶油（CLO）或肉桂树皮油（CBO）来制备活性薄膜。含有 3％CaCl₂的 ECA 膜的拉伸强度（TS）为 17.82 MPa，断裂伸长率（E）为 10.36％，高于不含 CaCl₂的薄膜。随着精油（EOs）含量的增加，TS 降低，E 增加。添加 CLO 或 CBO 还为 ECA 薄膜提供了抗氧化和抗菌活性。含 CBO 的 ECA 膜的抗氧化活性高于含 CLO 的膜。特别是，含 1％CBO 的 ECA 膜对 2,2-二苯基-1-苦基肼（DPPH）和 2,2'-联氮-双（3-乙基苯并噻唑啉-6-磺酸）（ABTS）自由基的清除活性分别为 50.45％和 99.37％。相比之下，含 CLO 的 ECA 膜对 O157：H7、Typhimurium、 和 的抗菌活性更高。这些结果表明，含有 CLO 或 CBO 的 ECA 薄膜可用作新型活性包装材料。
