Makale

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https://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/6

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Browsing Makale by ORCID "0000-0002-0403-5425"

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    Assessment of low-energy electron beam irradiation for effective surface microbial decontamination of fresh lettuce (Lactuca sativa L.) leaves
    (ELSEVIER, 2025-05-12) Turan, Ozlem; Cetintas, Aydin Ozan; Gokalp, Metin; Halkman, Hilal Beyhan; Ic, Erhan; Kantoglu, Omer; Kantoglu, Kadriye Yaprak
    Microbial contamination in fresh produce, particularly leafy greens such as lettuce and spinach, constitutes a significant public health concern due to infections caused by enteropathogens. Therefore, low-energy electron beam (LEEB) irradiation has been introduced to ensure microbial decontamination, analogous to conventional irradiation applications. This study examines the efficacy of LEEB irradiation in reducing bacterial contamination in lettuce (Lactuca sativa L.) and determines the radiation sensitivity of target microorganisms through D10 values compares it with the gamma-ray treatment. Hydroponically cultivated lettuce samples were inoculated with Escherichia coli, Salmonella Enteritidis, Listeria monocytogenes, and E. coli O157:H7. Following LEEB treatment, the D10 values of four pathogens were calculated between 0.371, and 0.737 kGy, whereas gamma irradiation resulted in lower values of 0.262-0.327 kGy. These results suggest that LEEB doses in the range of approximately 1.7 to 3 kGy may be sufficient to achieve an average 4-log reduction in pathogens. Additionally, the effects of LEEB irradiation on the physicochemical properties of lettuce were evaluated immediately after irradiation at doses of 1, 3, and 5 kGy. While no statistically significant differences were observed in color and total vitamin C (p>0.05), bioactive compound levels increased at higher doses (p<0.05). Fourier Transform Infrared (FT-IR) spectroscopy confirmed minimal structural alterations. These findings suggest that LEEB irradiation effectively decontaminates lettuce while maintaining its physicochemical integrity and enhancing its bioactive properties, presenting a promising and very important approach for improving fresh produce safety.
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    EXPERIMENTAL AND THEORETICAL ASSESSMENT OF SELECTED POLLUTANTS TREATED WITH GAMMA RADIATION AND HYDROGEN PEROXIDE
    (Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-11-28) Genç, Ayşenur; Ergun, Ece; Fitoz, Alper; Kantoğlu, Ömer; İnce, Mahir; Acar, Orhan
    Degradation of ibuprofen, triclosan, diclofenac, and ketoprofen in real wastewater effluent by gamma radiation/hydrogen peroxide was investigated on the basis of removal efficiencies, G-values, and kinetics. Gamma irradiation was performed using a 60Co source irradiator in the presence of different concentrations of hydrogen peroxide. The analyses of the pollutants were performed before and after irradiation treatment using a Liquid Chromatography-Mass Spectrometry (LC-MS) system. The addition of 0.5% hydrogen peroxide resulted in an enhanced removal efficiency of the target pollutants (93.92% for ibuprofen, 99.47% for triclosan, 86.65% for diclofenac, and 86.32% for ketoprofen) compared with the performance of the gamma irradiation process alone. The rate constants (k) of ibuprofen, triclosan, diclofenac, and ketoprofen increased by 1.42, 2.38, 1.38, and 3.37 times with 0.5% hydrogen peroxide addition, respectively. Moreover, the 90% decomposition of the target pollutants was achieved at lower doses in the gamma-ray/hydrogen peroxide system in comparison with the gamma treatment without hydrogen peroxide. Fukui functions and dual descriptor were calculated using density functional theory (DFT) to investigate the sensitivity of the target pollutants to hydroxyl radical attacks, to identify the initial reaction pathway, and to predict the degradation by-products. The findings were consistent with literature mechanisms and observed by-products.