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Electron Spin Resonance Spectroscopy of Gamma-Irradiated Glucose Polymers

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Abstract

Using electron spin resonance (ESR) spectroscopy, we revealed the irradiation-induced radicals in cellulose and starch. Before gamma-ray irradiation, no ESR signals were observed in both the glucose polymers. However, after gamma-ray irradiation, a singlet at g = 2.0 was observed, and a pair of side signals appeared simultaneously. The side signals were found at the symmetric field positions at both sides of the singlet signal. The side signals were visible in cellulose but not in starch. The side signals are found to be a precise indicator for irradiation effects in cellulose. They are originated from neither the peroxide radical of glucose polymer nor the so-called cellulosic radicals. By the simulation method, we found that the side signals are originated from a triplet due to a hyperfine interaction with two protons. By the theoretical simulation, we revealed that the signal undergo the rotational motions rather than rigid limit state (or no motion).

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Acknowledgments

A part of this study is the result of “Studies on Irradiated Food in Japan” carried out under the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. National Food Research Institute, 2-1-12 Kannondai, Tsukuba, 305-8642, Japan

    Hiromi Kameya & Mitsuko Ukai

  2. Department of Environmental Science, Hokkaido University of Education, 1-2 Hachiman-cho, Hakodate-shi, Hokkaido, 040-8567, Japan

    Hideo Nakamura & Mitsuko Ukai

  3. Japan Atomic Energy Agency, 1233 Watanuki-cho, Takasaki, 370-1292, Japan

    Yuhei Shimoyama

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  1. Hiromi Kameya
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  2. Hideo Nakamura
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  3. Mitsuko Ukai
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  4. Yuhei Shimoyama
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Correspondence to Hiromi Kameya.

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Kameya, H., Nakamura, H., Ukai, M. et al. Electron Spin Resonance Spectroscopy of Gamma-Irradiated Glucose Polymers. Appl Magn Reson 40, 395–404 (2011). https://doi.org/10.1007/s00723-011-0221-9

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  • DOI: https://doi.org/10.1007/s00723-011-0221-9

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