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    A Comprehensive Study on Sorption, Water Barrier, and Physicochemical Properties of Some Protein- and Carbohydrate-Based Edible Films
    (Springer, 2021) Gokkaya Erdem, Burcu; Diblan, Sevgin; Kaya, Sevim
    The main aim was to discuss the relation between water vapor transmission rate (WVTR) and moisture sorption isotherms (MSIs) of whey protein (WPI), soy protein isolate (SPI), and carboxymethyl cellulose (CMC) films. MSIs obtained using dynamic vapor sorption (DVS) instrument were fitted to GAB, BET, Oswin, Halsey, and Harkins-Jura models, and examined in detail with Peleg approach. BET and Oswin models had the highest R-2 values (0.999). The MSI's data were used to assess water vapor barrier interactions between permeability (P-calculated using WVTR), diffusivity (D), and solubility (S) properties and to compare their feasibility in P = DS simple equation. D and S were calculated using different approaches of Fick's second law and Henry's law. Calculated, measured, and predicted all different P, D, and S presented good operational interchangeability (r = 0.84-0.95). CMC films had the highest WVTR at 1008.06 g/m(2) day; those of WPI and SPI films were 865.79 and 595.71 g/m(2) day at studied condition. The hydrophilicity of CMC films deduced from its high water vapor adsorption capacity might lead to the lowest D among the studied films. This might result in swelling of film matrix and reduction of film porosity. It was interesting to note that films having the highest S-o (128.8 cm(3)/cm(3) cmHg) presented the lowest diffusivity (2.51 x 10(-11) cm(2)/s) with a highest WVTR. Oxygen barrier, mechanical, thermal, and structural measurements were also applied to characterize the films. SPI film was the finest film in terms of its barrier film properties and good film-forming ability.
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    Öğe
    Diffusional and antimicrobial behaviors of some antimicrobial agents in active multilayer plastic films
    (Wiley, 2022) Diblan, Sevgin; Kaya, Sevim
    In this study, diffusional and antimicrobial properties of the active-multilayer plastic films (LDPE/polyamide/LDPE-2% antimicrobial agent) were assessed. To understand the diffusion of antimicrobials from the active plastic films containing nisin, potassium sorbate, silver substituted zeolite, or chitosan, the active-multilayer plastic films has been put in different food simulating solutions. The food simulating solutions had various pH (3.0-7.0) and water activity (0.65-0.95) levels and were incubated at various storage temperatures (5-25 degrees C). The release experiments for the combinations of the factors were set according to three factors face-centered central composite design (CCF) of the response surface methodology (RSM). The diffusion rate constant (D) was calculated using Fick's law approach. The D of nisin and silver substituted zeolite was affected by pH or temperature, while a(w) is not a significant factor. However, D-ps was found to be the highest and depended on all factors (4.45-10.04 x 10(-14) cm(2)/s). Furthermore, no chitosan release was detected from the film matrix. The antimicrobial effectiveness of the films against microorganisms that were Staphylococcus aureus, Escherichia coli, Candida albicans, and Aspergillus niger varied according to the film type, which was verified by a challenge test on the kasar cheese surface. Moreover, nisin and silver substituted zeolite incorporated films showed great potential to inhibit bacteria, yeast, and molds. All active films, which were studied, had featured tasks for being active food packaging material and diffused in allowance limits.
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    Öğe
    Shelf life modelling of kas , ar cheese packaged with potassium sorbate, nisin, silver substituted zeolite, or chitosan incorporated active multilayer plastic films
    (Elsevier Sci Ltd, 2023) Diblan, Sevgin; Kaya, Sevim
    The effects of active films on the stability of kas , ar cheese stored at 5 degrees C, 15 degrees C, and 25 degrees C were investigated regarding microbial quality, physicochemical, and textural properties. The antimicrobials incorporated into the films (LDPE/polyamide/LDPE+2% antimicrobials) were potassium sorbate (PS-film), nisin (N -film), chitosan (CTS-film), or silver substituted zeolite (AgZeo-film). Shelf life, activation energy, and temperature quotient were also calculated. According to total mesophilic aerobic bacteria (TMAB) count, active films successfully inhibited microbial growth. The lowest growth rate for TMAB count of the samples was found in AgZeo-film, followed by N-film. CTS-film was more effective in controlling total yeast and mould count. PS-film showed some inhibition ability in both counts, but not as much as the other active films. Hence, antimicrobial agents incorporated into active films should be chosen consid-ering main deteriorative microorganism in food being packaged. The active films improved shelf life of kas , ar cheese by lasting the lag times of microorganisms.(c) 2023 Elsevier Ltd. All rights reserved.