Moriyama Tomoaki, Shindoh Kumiko, Taguchi Yoji, Watanabe Hisayoshi, Yasui Akemi, Joh Teruo
Center for Food Quality, Labeling and Consumer Services: 2-1, Shintoshin, Chuo-ku, Saitama 330-9731, Japan.
Shokuhin Eiseigaku Zasshi. 2003 Jun;44(3):145-9. doi: 10.3358/shokueishi.44.145.
Milled rice and bran were prepared from brown rice (Oryza sativa japonica) using a commercial scale rice-mill to investigate the changes in cadmium (Cd) content caused by the milling process. Rice sample solution was prepared by microwave digestion using HNO3 and HF, then analyzed by ICP-MS. Cd was measured at m/z 114 in interference correction with MoO and Sn. The digestion method was validated with 4 kinds of certified reference material of "rice flour". We found that the Cd content was reduced only slightly by the milling process. When the Cd concentration of brown rice was regarded as 100, the relative content of the milled rice was 97 (average of 6 samples). In addition, the reduction of the Cd content was only slight when milled rice was processed to "wash-free" rice. The relative Cd content of the bran was 139 when that of brown rice was regarded as 100. These results support the hypothesis that the Cd content is not greatly decreased by the milling process.
使用商业规模的碾米机将糙米（粳稻）加工成精米和米糠，以研究碾米过程中镉（Cd）含量的变化。采用硝酸和氢氟酸通过微波消解制备大米样品溶液，然后用ICP-MS进行分析。在与MoO和Sn进行干扰校正的情况下，于质荷比114处测定镉。采用4种“米粉”认证参考物质对消解方法进行了验证。我们发现，碾米过程仅使镉含量略有降低。当糙米的镉浓度视为100时，精米的相对含量为97（6个样品的平均值）。此外，将精米加工成“免洗”米时，镉含量的降低也很轻微。当糙米的镉含量视为100时，米糠的相对镉含量为139。这些结果支持了以下假设：碾米过程不会使镉含量大幅降低。
