시판 유통 김의 미생물 오염도, 사전 살균처리 및 전자선 조사 여부 확인

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 7 CFU/g of total aerobic counts, 6 CFU/g of yeasts and molds except in 3 samples. In addition, 10² CFU/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 heat-processed 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℃ and TL ratio (TL1/TL₂) of all the samples.