FOOD IRRADIATION, JAPAN
Online ISSN : 1884-3611
Print ISSN : 0387-1975
ISSN-L : 0387-1975
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Volume 44, Issue 1_2
Displaying 1-8 of 8 articles from this issue
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  • Studies on radiation induced radicals in irradiated black pepper after long-term storage
    Hiromi Kameya, Mitsuko Ukai
    2009 Volume 44 Issue 1_2 Pages 1-4
    Published: 2009
    Released on J-STAGE: November 25, 2011
    DOIhttps://doi.org/10.5986/jrafi.44.1
    JOURNAL FREE ACCESS
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    Using ESR the radiation induced radicals of black pepper after long-term storage were studied. Upon gamma ray irradiation, new signals were detected as twin peaks. It was revealed that these signals were very stable after the six month storage. We concluded that radiation induced new signals are very useful to know that the black pepper was irradiated or not.
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  • Electron spin relaxation behaviours of radiation induced radicals
    Hideyuki Ogawa, Mitsuko Ukai, A. Lund, Yuhei Shimoyama
    2009 Volume 44 Issue 1_2 Pages 5-8
    Published: 2009
    Released on J-STAGE: November 25, 2011
    DOIhttps://doi.org/10.5986/jrafi.44.5
    JOURNAL FREE ACCESS
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    Electron spin relaxation behaviours of radiation induced radicals were studied by the continous microwave saturation method of electron spin resonance (ESR) spectra. Radiation induced radicals in nutmeg yielded a sharp and intense ESR signal at g = 2.0. By the progressive saturation procedure, we could evaluate relaxation times (T1 and T2). The computer program to analyze the ESR line shape using all data points on a saturation curve was applied. Based on the theoretical analysis, the relaxation behaviors of radiacals were revealed. Radiation induced radicals of the specimens yielded relaxation times, T1 in the μsec and T2 in nsec ranges, respectively. Upon the irradiation, T1 shortened, and T2 lengthened. The progressive saturation curve was changed by the irradiation.
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  • The relaxation phenomena of radicals induced in irradiated fresh mangoes
    Masahiro Kikuchi, Hideyuki Ogawa, Norio Morishita, Mitsuko Ukai, Yasuh ...
    2009 Volume 44 Issue 1_2 Pages 9-13
    Published: 2009
    Released on J-STAGE: November 25, 2011
    DOIhttps://doi.org/10.5986/jrafi.44.9
    JOURNAL FREE ACCESS
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    Using the γ-irradiated fresh mangoes followed by freeze-drying and powderization, electron spin resonance spectrometry of specimens was performed. As a result, a strong single peak in the flesh, the pericarp and the seed was observed at g=2.004 and attributed to organic free radicals. When relaxation times of the peak was calculated using the method of Lund et al., T2 showed dose responses according to increasing doses while T1 was almost constant. Dose responsibility of the relaxation time T2 obtained from flesh specimens of the mangoes could be measured regardless of the preservation period of 1 to 9 days following γ-irradiation. Therefore, there might be possible to detect the irradiation treatment of fresh mangoes using relaxation time T2.
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  • Effect of gamma irradiation on the cigarette beetles reared on cayenne pepper
    Taro Imamura, Akihiro Miyanoshita, Setsuko Todoriki
    2009 Volume 44 Issue 1_2 Pages 14-16
    Published: 2009
    Released on J-STAGE: November 25, 2011
    DOIhttps://doi.org/10.5986/jrafi.44.14
    JOURNAL FREE ACCESS
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    Effect of gamma irradiation on the survival of the cigarette beetles reared on cayenne pepper was investigated. Gamma ray at a dose of 62 Gy completely killed eggs and larvae of the beetles. Some pupae survived at 540 Gy, but all pupae were killed at 1076 Gy.
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