Sorption, diffusivity, permeability and mechanical properties of chitosan, potassium sorbate, or nisin incorporated acti
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ORIGINAL ARTICLE
Sorption, diffusivity, permeability and mechanical properties of chitosan, potassium sorbate, or nisin incorporated active polymer films Sevgin Diblan1 • Burcu Go¨kkaya Erdem2 • Sevim Kaya2
Revised: 14 February 2020 / Accepted: 2 April 2020 Ó Association of Food Scientists & Technologists (India) 2020
Abstract The active multilayer packaging films were formed from low-density polyethylene (LDPE) and polyamide containing a 2% antimicrobial agent in one of the LDPE sides of the film (LDPE/polyamide/LDPE-2% antimicrobial agent). The antimicrobial agents used were potassium sorbate (PS-film), nisin (N-film), or chitosan (CTS-film). The effects of antimicrobial incorporation on water vapor permeability (P), diffusivity (Deff), and solubility (So and SH) of the active and control films (LDPE/ polyamide/LDPE) were investigated. A dynamic vapor sorption analyzer (DVS) was used to estimate the sorption isotherms of the films at 25 °C. Peleg was found to be the best equation to describe sorption behaviors. The addition of PS and nisin into the film matrix resulted in a lower P than that of the control film. The Deff values of the active films were lower than those of control films, except for the CTS-film. The high water-holding capacity of PS and nisin might limit the Deff of the respective films. It was found that Henry’s law was applicable to relate P, Deff, and So and SH values of the multilayer film [correlation coefficient (r) = 0.909–0.971]. The mechanical and thermal properties of the active films were not significantly affected by the incorporation of PS and nisin (p [ 0.05). However, the impact of stress and elongation (transverse direction) on the CTS-film was lower than on other films, which
& Sevgin Diblan [email protected] 1
Department of Food Engineering, Faculty of Engineering, Adana Alparslan Tu¨rkes¸ Science and Technology University, 01250 Adana, Turkey
2
Department of Food Engineering, Engineering Faculty, Gaziantep University, 27310 Gaziantep, Turkey
indicated that chitosan improved the mechanical properties of the film. Keywords Antimicrobial active film Sorption Diffusion Permeability Mechanical and thermal properties
Introduction Food packaging can take an active role in food safety during the storage of a product since antimicrobial agents can be incorporated into polymer packaging films to enhance food safety in terms of human health (Barzegar et al. 2014). This relatively new packaging technology has been called ‘‘antimicrobial active packaging system.’’ The types of polymers and the additives that are used are important for characterizing the structural and barrier properties of packaging materials (Bastarrachea et al. 2011). The incorporation of antimicrobials into film materials can affect the physical and barrier properties, can change the hydrophilicity/hydrophobicity of the film matrix related with the characteristics of the ingredients (Bastarrachea et al. 2011). Some studies have been conducted to observe these properties of multilayer or multi-blended fil
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