Browsing by Subject "Volatile organic compounds"

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    Pulsed UV-C radiation of beef loin steaks: Effects on microbial inactivation, quality attributes and volatile compounds
    (Elsevier Ltd, 2021) Söbeli C.; Uyarcan M.; Kayaardı S.
    The aim of this study was to investigate the effect of pulsed light treatment at fluences of 0.525, 1.05, 2.1 and 4.2 J/cm2 on the chemical composition, microbiological quality and volatile compounds of beef loin steaks. Pulsed light treatment did not affect total moisture, total protein, total lipid and ash content of samples significantly (P > 0.05). The a* and b* values of the pulsed light treated samples significantly decreased compared to control samples with maximum difference of 2.11 and 1.33 unit, respectively (P < 0.05). The highest reduction (3.49 ± 0.67 log CFU/g) in total aerobic mesophilic bacterial counts (compared to naturally occuring microbiota in control group) was achieved for samples treated with 4.2 J/cm2 of UV-C fluence level. A total of 14 volatiles, mainly aldehydes, alcohols, ketones and terpen compounds were identified in the raw samples and pulsed light treatment caused an increase in the amounts of some volatile compounds, including hexanal (from 33.41 μg/kg to 69.67 μg/kg), 2-heptenal (from 0.60 μg/kg to 1.52 μg/kg), 2-octenal (from 0.39 μg/kg to 1.58 μg/kg), 2,4-nonadienal (from 0.05 μg/kg to 0.24 μg/kg), 2,4-decadienal (from 0.04 μg/kg to 0.26 μg/kg), 3-octen-2-one (from 0.37 μg/kg to 2.53 μg/kg), limonene (from 2.06 μg/kg to 18.42 μg/kg). Otherwise, pulsed light decreased the levels of some compounds coming from microbial metabolism such as 1-heptanol (from 0.57 μg/kg to 0.39 μg/kg), 1-octen-3-ol (from 1.83 μg/kg to 1.12 μg/kg), 2-octen-1-ol (from 0.28 μg/kg to 0.09 μg/kg). In conclusion, pulsed light treatment can enhance the microbial safety of meat and has potential for use in the meat industry. © 2020 Elsevier Ltd
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    Gamma irradiated Cu-doped TiO2 nanoparticles for selective ammonia sensing
    (Elsevier Ltd, 2024) Urfa Y.; Akyürekli S.; Katı M.İ.; Çorumlu V.; Altındal A.
    In this research, the effect of gamma ray doses on volatile organic compound (VOC) sensing properties of Cu doped TiO2 nanoparticles are studied to further improve the VOC sensing performance. Pure and Cu doped TiO2 nanoparticles have been prepared by sol-gel technique on Au interdigitated plexiglas substrate and irradiated by gamma-rays with doses varying from 1 to 150 KGy. The irradiation was performed by using 60Co as gamma source. The structural, morphology and modifications were analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), and Atomic Force Microscopy (AFM) techniques. The sensing performance of these films toward ethanol, methanol, 2-propanol, benzene, toluene, xylene and ammonia vapors has been tested. It was observed that no remarkable sensor response to any vapors except ammonia was observed at room temperature. Changes in sensor’ ammonia sensitivity have been correlated with the gamma radiation dose and Cu doping ratio. Maximum sensing performance was observed with 3% Cu doped TiO2 exposed to gamma radiation dose of 150 kGy. © 2024 Elsevier Ltd