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İLASLAN, Kerem

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Kerem

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İLASLAN
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    Characterization of silver Ions-doped organomodified nanoclays
    (Springer, 2023-01) İlaslan, Kerem; Tornok, F.; Gastronomy and Culinary Arts; İLASLAN, Kerem
    In this study, montmorillonite (MMT) and halloysite nanoclays were organomodified with cationic surfactants N-cetyl-N, N, N-trimethylammonium bromide (CTAB) and poly diallyl dimethylammonium chloride (PDAC) to enhance intercalation characteristics. The organomodified nanoclay samples were doped with Ag+ ions in order to enhance antimicrobial properties, and their XRD, ATR-FTIR, ICP-MS, SEM, TEM, zeta potential, mean particle size, and in vitro Ag+ release properties were further investigated. The antibacterial activity of the Ag-doped organoclays was analyzed by broth dilution method as well as the determination of minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against gram-positive (Staphylococcus aureus ATCC 25,923 and Listeria monocytogenes ATCC 13,932) and gram-negative (Escherichia coli O157:H7 ATCC 25,922 and Salmonella enterica subsp. enterica serovar Typhimurium ATCC 14,028) bacterial strains. The surface load of the organomodified nanoclays changed to positive due to the cationic surfactants, and as a result of the XRD examinations, the interlayer space of the nanoclays increased. ATR-FTIR and ICP-MS analysis indicated that Ag+ ions successfully doped into the nanoclay structure. Also, MMT-type nanoclay samples released the Ag+ ions into the water medium more than halloysite-type nanoclay samples. Nanoclays organomodified by CTAB had an effective bactericidal effect on each bacterial strain than PDAC-modified nanoclays. Ag-doped nanoclays had MIC and MBC values varying from 0.6 to 5 mg/ml in the nutrient broth medium for all the bacterial strains. In conclusion, intercalated and Ag+-doped MMT and halloysite nanoclays were successfully prepared and effectively used for bacterial growth inhibition.
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    Development of polycaprolactone biodegradable films reinforced with silver-doped organoclay and effect on the microbiological quality of ground beef meat
    (Wiley, 2022-10) İlaslan, Kerem; Tornuk, F.; Durak, M. Z.; Gastronomy and Culinary Arts; İLASLAN, Kerem
    In this work, a comparative study was held to obtain biodegradable antibacterial nanocomposite films using polycaprolactone (PCL) and silver-ion-doped organomodified halloysite (HNT) and montmorillonite (MMT) nanoclays. The PCL-based nanocomposite films (PNFs) were characterized in terms of thickness, mechanical, thermal, morphological, molecular, color, gas barrier, and antibacterial activity properties. The PNFs were also tested for enhancement of microbiological quality of ground beef. The addition of the Ag-doped nanoclays provided improved mechanical (tensile strength [TS] and elongation at break [EB]) and barrier (water vapor and oxygen permeability) properties in comparison to the pure PCL film. PNF formation increased the crystallization temperature (Tc) of pure PCL by about 1°C and decreased the crystallinity (Xc) from 44.8% to 41.3%. The PNFs exhibited strong in vitro antibacterial activity against the test pathogens and bacteriostatic effect on natural bacterial load of ground beef meat during the storage, thus providing it better microbiological quality. Novelty impact statement: This work focuses on the production and characterization of new packaging materials reinforced with silver-ion-doped halloysite and montmorillonite nanoclays and improving the microbial quality of ground beef meat by this material. PCL-based nanocomposite films reinforced with Ag-doped nanoclays had enhanced mechanical and barrier properties and gained in vitro antibacterial activity. Additionally, its antibacterial potential in food applications was demonstrated by the ground beef meat packaging studies.