Dynamics of Radioactive Cesium (134Cs and 137Cs) during the Milling of Contaminated Japanese Wheat Cultivars and during the Cooking of Udon Noodles Made from Wheat Flour

Author:

KIMURA KEITAROU1,KAMEYA HIROMI1,NEI DAISUKE1,KAKIHARA YOSHITERU2,HAGIWARA SHOJI1,OKADOME HIROSHI1,TANJI KATSUO3,TODORIKI SETSUKO1,MATSUKURA USHIO1,KAWAMOTO SHINICHI1

Affiliation:

1. 1National Food Research Institute, National Agriculture and Food Research Organization, 2-1-12 Kannondai, Tsukuba City, Ibaraki Prefecture 305-8642, Japan

2. 2Japan Grain Inspection Association, 15-6 Nihonbashi Kabuto-cho, Chuo-ku, Tokyo 103-0026, Japan

3. 3Fukushima Agricultural Technology Centre, 116 Shimonakamichi, Takakura, Hiwada-Machi, Koriyama City, Fukushima Prefecture 963-0531, Japan

Abstract

The fate of radioactive cesium (134Cs plus 137Cs) during the milling of contaminated Japanese wheat cultivars harvested in FY2011, and during the cooking of Japanese udon noodles made from the wheat flour, was investigated. Grain samples containing various radioactive cesium concentrations (36.6 to 772 Bq/kg [dry weight]) were milled using a laboratory-scale test mill to produce eight fractions: three break flours (1B, 2B, and 3B), three reduction flours (1M, 2M, and 3M), bran, and shorts. The concentrations of radioactive cesium were found to be highest in the bran fractions of all the samples tested, with 2.3- to 2.5-fold higher values than that of the whole grain. Shorts contained radioactive cesium levels similar to that of the whole grain. In contrast, radioactive cesium concentrations in other fractions were found to be less than half the concentration in whole grain. The average processing factor (PF) value calculated for patent flour (0.401 ± 0.048), made from the mixture of 1B, 2B, 1M, and 2M for human consumption, or for low-grade flour (0.467 ± 0.045), made from the mixture of 3B and 3M, was found to be less than 0.5; whereas the average PF value (2.07 ± 0.232) for feed bran (mixture of bran and shorts), which has been used mainly as livestock feed in Japan, was over 2.0. Boiling udon noodles (made from patent flour) resulted in a substantial reduction (>70% of initial amount) of radioactive cesium. Moreover, radioactive cesium was reduced further (<10% of the initial amount) in the subsequent rinsing process, and the PF value of boiled noodles was recorded as 0.194. These results demonstrated that patent flour containing radioactive cesium can be made safe for human consumption by adopting the standard limit for radioactive cesium in wheat grain and that radioactive cesium in udon noodles is substantially reduced by cooking.

Publisher

International Association for Food Protection

Subject

Microbiology,Food Science

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