Effect of Bay Leaves Essential Oil Concentration on the Properties of Biodegradable Carboxymethyl Cellulose-Based Edible Films
by
Esther Rincón 1, Luis Serrano 2
, Alina M. Balu 1, José J. Aguilar 3, Rafael Luque 1,4,* and Araceli García 1,*
Esther Rincón 1, Luis Serrano 2, Alina M. Balu 1, José J. Aguilar 3, Rafael Luque 1,4,* and Araceli García 1,*
1
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
2
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
3
Departamento de Microbiología, Universidad de Córdoba, Campus de Rabanales, Edificio Severo Ochoa (C-6), CTRA. Nnal. IV-A, Km 396, E-14014 Córdoba, Spain
4
Scientific Center for Molecular Design and Synthesis of Innovative Compounds for the Medical Industry, People’s Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya str., 117198 Moscow, Russia
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(15), 2356; https://doi.org/10.3390/ma12152356
Received: 18 June 2019 / Revised: 18 July 2019 / Accepted: 22 July 2019 / Published: 24 July 2019
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 (Escherichia coli and Candida glabrata), this avoiding an early food oxidation.
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Keywords:
films; food preservation; carboxymethyl cellulose; bay leaves; essential oil
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MDPI and ACS Style
Rincón, E.; Serrano, L.; Balu, A.M.; Aguilar, J.J.; Luque, R.; García, A. Effect of Bay Leaves Essential Oil Concentration on the Properties of Biodegradable Carboxymethyl Cellulose-Based Edible Films. Materials 2019, 12, 2356.
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