重庆市江津区含硒稻谷碾减率与硒损失关系探究

收集了江津区7个乡镇的19种含硒稻米,探究了碾磨加工对稻米中硒含量的影响。结果表明,不同品种的糙米中硒含量存在显著性差异(P<0.05),渝香203、旌1优华珍、Q香优100及晶两优510对硒富集能力较强。受稻米品种和种植环境的影响,不同稻米碾减率、米糠硒含量及碾磨过程中的硒损失情况不同,渝香203和旌1优华珍的米糠中硒含量较高,最高可达0.82mg/kg,可作为加工过程中产生的富硒副产物被广泛利用。所有测试样品均表现为随碾磨时间的延长,稻米碾减率增大,加工精度越高,硒的损失率越大,最高损失率可达44.39%。贾嗣镇种植的旌1优华珍和晶两优510、白沙镇种植Q香优100及中山镇种植的渝香203在碾磨加工过程中硒的损失量较小,累计碾磨80s后,一级精米中硒含量仍可达到富硒水平。

The relationship between selenium-containing rice milling rate and selenium loss in Jiangjin district, Chongqing

19 kinds of selenium-containing rice were collected from 7 towns in Jiangjin District,and the influence of milling on the selenium content of rice was investigated.Significant differences were found in the selenium content in different varieties of brown rice(P<0.05).Yuxiang 203,Jing 1 You Huazhen,Q Xiang You 100 and Jing Liang You 510 had stronger selenium accumulation ability.Under the influence of rice varieties and planting environment,rice bran with different milling rate,selenium content and selenium loss in the milling process were different.The selenium content in rice bran of Yuxiang 203 and Jing1 Youhuazhen was higher,up to 0.82 mg/kg,which could be widely used as selenium-rich by-products produced in the processing process.All the samples showed that higher milling rate could cause higher processing precision and higher loss rate of selenium,and the highest loss rate of selenium was up to 44.39%.During the milling process,the selenium loss of Jing1 Youhuazhen and Jing Liang You 510,planted in Jiasui Town,Q Xiang You 100,and Yuxiang 203 planted in Baisha town and Zhongshan town,was relatively small.After grinding the 80 s,the selenium content in first-grade polished rice could still reach the level of selenium enrichment.