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Journal Articles

Electron-spin relaxation times of irradiated fructose measured with pulsed ESR

Kikuchi, Masahiro; Kameya, Hiromi*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 85, 2014/03

Journal Articles

Rapid ESR measurement of irradiated fresh papaya

Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 78, 2013/01

no abstracts in English

Journal Articles

Electron-spin relaxation phenomena in irradiated saccharides detected by pulsed electron paramagnetic resonance spectroscopy

Kikuchi, Masahiro; Kameya, Hiromi*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

Radiation Physics and Chemistry, 81(10), p.1639 - 1645, 2012/10

 Times Cited Count:1 Percentile:11.68(Chemistry, Physical)

no abstracts in English

Journal Articles

Analysis of radicals induced in irradiated foods

Kishida, Keigo*; Kaimori, Yoshihiko*; Kawamura, Shoei*; Sakamoto, Yuki*; Nakamura, Hideo*; Kikuchi, Masahiro; Shimoyama, Yuhei; Kobayashi, Yasuhiko; Ukai, Mitsuko*

Shokuhin Shosha, 47(1), p.1 - 5, 2012/09

no abstracts in English

Journal Articles

Analysis of relaxation times of radicals in irradiated black pepper using pulse-ESR and CW-ESR

Kameya, Hiromi*; Kikuchi, Masahiro; Todoriki, Setsuko*; Furuta, Masakazu*; Kobayashi, Yasuhiko; Hara, Hideyuki*; Shimoyama, Yuhei; Ukai, Mitsuko*

Shokuhin Shosha, 47(1), p.6 - 10, 2012/09

no abstracts in English

Journal Articles

Relaxation behaviors of free radicals from $$gamma$$-irradiated black pepper using pulsed EPR spectroscopy

Kameya, Hiromi*; Kikuchi, Masahiro; Hara, Hideyuki*; Furuta, Masakazu*; Todoriki, Setsuko*; Kobayashi, Yasuhiko; Ukai, Mitsuko*; Shimoyama, Yuhei

Applied Magnetic Resonance, 42(2), p.153 - 159, 2012/03

 Times Cited Count:3 Percentile:22.91(Physics, Atomic, Molecular & Chemical)

no abstracts in English

Journal Articles

Relaxation behaviors of electron spin in irradiated fresh papayas

Kikuchi, Masahiro; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei; Kobayashi, Yasuhiko

JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 81, 2012/01

no abstracts in English

Journal Articles

Initial decay process of radicals induced in irradiated food

Kaimori, Yoshihiko; Sakamoto, Yuki*; Kikuchi, Masahiro; Kameya, Hiromi*; Nakamura, Hideo*; Shimoyama, Yuhei; Kobayashi, Yasuhiko; Ukai, Mitsuko*

Shokuhin Shosha, 46(1), p.13 - 18, 2011/09

Journal Articles

ESR detection procedure of irradiated papaya containing high water content

Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

Radiation Physics and Chemistry, 80(5), p.664 - 667, 2011/05

 Times Cited Count:9 Percentile:62.21(Chemistry, Physical)

Journal Articles

A Rapid detection for irradiated fresh papayas using ESR spectroscopy

Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

Radioisotopes, 60(4), p.163 - 171, 2011/04

no abstracts in English

Journal Articles

Dose-dependency of electron spin relaxations in irradiated fresh mangoes

Kikuchi, Masahiro; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei; Kobayashi, Yasuhiko

JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 85, 2011/01

Journal Articles

Relaxation behaviour and dose dependence of radiation induced radicals in irradiated mango

Kameya, Hiromi*; Kakita, Daisuke*; Kaimori, Yoshihiko*; Kikuchi, Masahiro; Kobayashi, Yasuhiko; Ukai, Mitsuko*; Shimoyama, Yuhei

Radioisotopes, 59(10), p.607 - 614, 2010/10

Mangoes are imported to Japan after treated with hot water. Recently, irradiated mangoes imported to U. S. are widely used. This paper reports on the ESR method for analyzing the radiation induced radicals of irradiated mangoes. Upon the $$gamma$$ ray irradiation, a strong signal peak in the flesh and skin of mangoes was observed at $$g$$ = 2.004. This singlet peak may be attributed to organic free radicals. The ESR spectra of the flesh and skin of mangoes showed the radiation induced radicals due to cellulose by irradiation over 12 kGy. The relaxation time (T1 and T2) of the singlet signal were calculated. T2 showed dose response according to increasing the irradiation dose levels, while T1 was almost constant. The value of (T1T2)1/2 showed the dependence of irradiation dose level.

Journal Articles

Relaxation phenomena of radicals induced in irradiated fresh papayas

Kikuchi, Masahiro; Kakita, Daisuke*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko

Shokuhin Shosha, 45(1-2), p.34 - 38, 2010/09

Journal Articles

ESR study of free radicals in mango

Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*

Spectrochimica Acta, Part A, 75(1), p.310 - 313, 2010/01

An electron spin resonance (ESR) spectroscopic study of radicals induced in irradiated fresh mangoes was performed. Mangoes in the fresh state were irradiated with $$gamma$$-rays, lyophilized and then crushed into a powder. The ESR spectrum of the powder showed a strong main peak at ${it g}$ = 2.004 and a pair of peaks centered at the main peak. The main peak was detected from both flesh and skin specimens. This peak height gradually decreased during storage following irradiation. On the other hand, the side peaks showed a well-defined dose-response relationship even at 9 days post-irradiation. The side peaks therefore provide a useful means to define the irradiation of fresh mangoes.

Journal Articles

ESR method for detecting irradiated fresh mangoes

Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei*; Kobayashi, Yasuhiko

JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 86, 2009/12

When tropical fruits are imported, quarantine treatments are required for preventing plant pests. The irradiation is a choice of the quarantine treatments for tropical fruits in the world. When the irradiation is utilized as the treatment, detection methods are required to endorse the reliability of labels for consumers. To distinguish the irradiated fresh mangoes from non-irradiated ones, radical detection was carried out using ESR. After freeze-drying mangoes, the ESR main peak was observed but the signal intensity was affected by ripeness and period of storage. We found that the existence of side peaks is an effective indicator to detect fresh mangoes irradiated to dose range of quarantine treatment. Since ESR method is able to measure without complicate preparation, this technique is useful to detect the irradiation treatment against a wide variety of foods.

Journal Articles

An ESR study of radicals induced in irradiated fresh mango

Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Ukai, Mitsuko*; Shimoyama, Yuhei*; Kobayashi, Yasuhiko

Radioisotopes, 58(12), p.789 - 797, 2009/12

no abstracts in English

Journal Articles

The Relaxation phenomena of radicals induced in irradiated fresh mangoes

Kikuchi, Masahiro; Ogawa, Hideyuki*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*

Shokuhin Shosha, 44(1-2), p.9 - 13, 2009/09

no abstracts in English

Oral presentation

Radical detection for irradiated fresh mango by ESR spectroscopy

Kikuchi, Masahiro; Hussain, M. S.; Morishita, Norio; Ukai, Mitsuko*; Shimoyama, Yuhei*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

ESR spectroscopy for irradiated fresh mango

Kikuchi, Masahiro; Kobayashi, Yasuhiko; Morishita, Norio; Hussain, M. S.; Ukai, Mitsuko*; Shimoyama, Yuhei*

no journal, , 

no abstracts in English

Oral presentation

ESR detection of radicals in irradiated fresh mango

Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*

no journal, , 

34 (Records 1-20 displayed on this page)