In this study, carboxymethyl cellulose (CMC) films containing 1%, 2%, and 3% Chinese fir essential oil (CFEO) were prepared. The mechanical, optical, physical, microstructural, thermal stability and antimicrobial properties of the films were studied. A traditional steam distillation method was applied for CFEO extraction, in which 35 volatile components were identified. The research results showed that the CMC film mixed with 1% CFEO had the highest tensile strength (TS) and elongation at break (EB), whereas the flexibility was decreased under higher concentrations of CFEO. However, the film’s degree of transparency under controlled humidity did not decrease with an increase in CFEO concentration; thus, the sensory evaluation was not adversely effect. Furthermore, the thickness and the water solubility (WS) of film increased after the addition of CFEO. The thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) results indicated that the thermal stability of the CMC-CFEO films improved. Moreover, the composite films showed excellent inhibitory effects toward Gram-positive bacterias and Penicillium citrinum. The treatments of grapes with CMC + 1% CFEO resulted in the best properties during storage. CMC-CFEO film can be a candidate for food packaging due to its excellent performances.

中文翻译：

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杉木香精油掺入羧甲基纤维素膜的表征及其在光亮麝香葡萄品质改良中的应用

在这项研究中，制备了包含1％，2％和3％的杉木精油（CFEO）的羧甲基纤维素（CMC）膜。研究了薄膜的机械，光学，物理，微观结构，热稳定性和抗菌性能。CFEO萃取采用传统的蒸汽蒸馏方法，其中鉴定出35种挥发性成分。研究结果表明，与1％CFEO混合的CMC膜具有最高的拉伸强度（TS）和断裂伸长率（EB），而在CFEO浓度较高时，柔韧性降低。但是，在受控湿度下，薄膜的透明度不会随着CFEO浓度的增加而降低；因此，感官评价没有不良影响。此外，加入CFEO后，膜的厚度和水溶性（WS）增加。热重分析（TGA）和差示扫描量热法（DSC）结果表明，CMC-CFEO薄膜的热稳定性得到了改善。此外，复合膜对革兰氏阳性菌和柠檬青霉。用CMC + 1％CFEO处理葡萄在储存过程中具有最佳性能。CMC-CFEO膜由于其优异的性能而可以作为食品包装的候选材料。