Rincón Esther, Serrano Luis, Balu Alina M, Aguilar José J, Luque Rafael, García Araceli
Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), CTRA. Nnal. IV-A, Km 396, E-14014 Córdoba, Spain.
Departamento de Química Inorgánica e Ingeniería Química, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie (C-3), CTRA. Nnal. IV-A, Km 396, E-14014 Córdoba, Spain.
Materials (Basel). 2019 Jul 24;12(15):2356. doi: 10.3390/ma12152356.
Films containing bay leaves essential oils (BEOs) were prepared and evaluated for edible packaging applications. The BEOs were extracted by the Soxhlet method, using ethanol or methanol as organic solvent. Then, films were prepared by "solvent casting" technique using carboxymethyl cellulose (CMC), with different concentrations for the as-obtained BEOs (from 1% to 30% wt.). The resulting films were characterized to evaluate their physical (thickness, moisture content, water solubility and water vapor permeability), optical (transparency and UV-light barrier), mechanical (tensile strength and elongation at break), antioxidant and antimicrobiological properties Attractive films were obtained for food active packaging applications, as they presented a high antioxidant activity (up to 99%) and total phenolic content, and good barrier properties against water vapor (50% improved of CMC) in the case of CMC-film containing 15% wt. ethanolic extract. Related to optical properties, UV-light barrier effect was increased (almost 100% of protection) avoiding typical lipids oxidation in food systems. High water solubility (93%) was also found, ensuring also their biodegradability. Moreover, it was demonstrated that developed films inhibit microorganisms' growth ( and ), this avoiding an early food oxidation.
制备了含有月桂叶精油（BEOs）的薄膜，并对其在可食用包装应用中的性能进行了评估。采用索氏提取法，以乙醇或甲醇为有机溶剂提取BEOs。然后，使用羧甲基纤维素（CMC）通过“溶剂浇铸”技术制备薄膜，所得BEOs的浓度不同（从1%到30%重量）。对所得薄膜进行表征，以评估其物理性能（厚度、水分含量、水溶性和水蒸气透过率）、光学性能（透明度和紫外线阻隔性）、机械性能（拉伸强度和断裂伸长率）、抗氧化性能和抗菌性能。对于食品活性包装应用而言，所获得的薄膜颇具吸引力，因为它们具有较高的抗氧化活性（高达99%）和总酚含量，并且对于含有15%重量乙醇提取物的CMC薄膜，其对水蒸气具有良好的阻隔性能（比CMC提高了50%）。在光学性能方面，紫外线阻隔效果增强（几乎100%的防护），避免了食品体系中典型的脂质氧化。还发现其具有高水溶性（93%），这也确保了它们的生物降解性。此外，已证明所制备的薄膜能抑制微生物生长（和），从而避免食品过早氧化。
