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KMID : 1134820130420101673
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Journal of the Korean Society of Food Science and Nutrition
2013 Volume.42 No. 10 p.1673 ~ p.1681
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Identification of Pre-pasteurization or Pre-irradiation Treatment in Frozen Crushed Garlic Commercially Available in Korean Market
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Kim Hyo-Young
Ahn Jae-Jun
Kim Kui-Ran
Jeong Jin-Hwa
Park Ki-Hwan
Kwon Joong-Ho
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Abstract
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Five different chopped frozen garlic products samples, three from Chinese and two from Korean origins being commercially available products in Korean market, were used to confirm their pre-pasteurization or pre-irradiation status by screening (direct epifluorescent filter technique/aerobic plate counts, DEFT/APC; electronic nose, E-nose; photostimulated luminescence, PSL) and identification (thermoluminescence, TL; electron spin resonance, ESR) techniques. Some parts of samples were gamma-irradiated at 1 kGy to be used as control samples in irradiation history identification. DEFT/APC and e-nose successfully showed distinct results between the domestic and imported samples. The PSL photon counts of all the unknown samples were less than 700 (negative), while most of 1 kGy-irradiated samples gave PSL photon counts more than 5,000 (positive). The domestic unknown samples produced the TL glow peaks after 300°C or more, whereas the imported samples showed TL peaks at the range of 240～250°C. A clear TL glow peak was obtained from all irradiated samples at 150～250°C. The unknown samples of Chinese origin gave radiation-specific cellulose ESR signal that was not shown by domestic samples. A multiple step of applying the physical analytical methods is recommended for the effective identification of irradiation status on chopped frozen garlic products.
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KEYWORD
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frozen crushed garlic, irradiation, photostimulated luminescence, thermoluminescence, electron spin resonance
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