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http://dx.doi.org/10.9721/KJFST.2017.49.1.20

Monitoring microbiological contamination, pre-decontamination, and irradiation status of commercial dried laver (Porphyra sp.) products  

Lee, Eun-Jin (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University)
Kim, Gui-Ran (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University)
Lee, Hye-Jin (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University)
Kwon, Joong-Ho (School of Food Science & Biotechnology, and Food Bio-industry Research Institute, Kyungpook National University)
Publication Information
Korean Journal of Food Science and Technology / v.49, no.1, 2017 , pp. 20-27 More about this Journal
Abstract
Eighteen commercial laver (Porphyra sp.) products were purchased from Korean market and were monitored for their microbial contamination, pre-decontamination, and luminescence properties. The laver samples showed considerable variation in their microbial contamination, from $10-10^7CFU/g$ of total aerobic counts, <$10-10^2CFU/g$ of coliforms in 4 dried laver samples, and <$10-10^6CFU/g$ of yeasts and molds except in 3 samples. In addition, $10^2CFU/g$ of Bacillus cereus was found in one sample. DEFT/APC analysis was suitable for demonstrating whether the samples were pre-decontaminated or not, with DEFT/APC values lower than 2.0 log for non-heated samples and 1.0-8.5 log for heatprocessed samples. In photostimulated luminescence (PSL) calibration, 15 samples irradiated at 1 kGy showed positive (irradiated) values more than 5000 PCs. Furthermore, thermoluminescence (TL) analysis by separating the marker minerals from samples revealed the potential to be employed in identifying irradiation status by determining $1^{st}$ TL glow at $125-175^{\circ}C$ and TL ratio ($TL_1/TL_2$) of all the samples.
Keywords
dried laver; microbial contamination; irradiation; DEFT/APC; PSL/TL;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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