市售富硒食品中硒形态及含量的分析

Analysis of the form and content of selenium in commercial selenium-rich food

中文关键词:  富硒食品  总硒  无机硒  有机硒  电感耦合等离子体质谱法

英文关键词:selenium-rich food  total selenium  inorganic selenium  organic selenium  inductively coupled plasma mass spectrometry

中文摘要:

      目的 研究市售富硒食品中硒元素的存在形态及含量情况。方法 优化电感耦合等离子体质谱法, 以Ge元素作为内标, 采用He碰撞池模式, 测定富硒食品中总硒、无机硒含量。对100批次市售富硒食品进行检测, 按照相关标准分析富硒食品的质量水平。结果 优化的方法能够有效提取样品中总硒、无机硒, 线性相关系数为0.9999, 回收率为80%~110%, 均能满足检验要求。有30批次富硒食品中总硒含量低于标示值的80%, 不符合GB 28050—2011《食品安全国家标准 预包装食品营养标签通则》要求, 8批次富硒大米总硒含量超出GB/T 22499—2008《富硒稻谷》规定的0.04~0.30 mg/kg范围, 其中2批次大米的总硒超过最高限量的2倍; 此外, 9批次样品的有机硒占比少于总硒含量的80%, 不符合DBS 42/002—2014《食品安全地方标准 富有机硒食品硒含量要求》要求。结论 市售富硒食品存在总硒含量不达标或超标、有机硒占比过低等质量问题, 抽检的样本中有30%产品的标识硒含量与真实值不符合, 富硒产地总硒含量和有机硒占比的不合格率明显低于非富硒产地。

英文摘要:

      Objective To study the form and content of selenium in commercial selenium-rich food. Methods The inductively coupled plasma mass spectrometry was optimized, and the content of total selenium and inorganic selenium in selenium-rich food were determined by using Ge element as internal standard and He collision cell model. The 100 batches of selenium-rich food on the market were tested and the quality level of selenium-rich food was analyzed according to relevant standards. Results The optimized method can effectively extract total Se and inorganic Se from samples. The linear correlation coefficient was 0.9999, and the recoveries were 80%-110%, which could meet the test requirements. The total selenium content of 30 batches of selenium-enriched foods was less than 80% of the labeled value, which did not meet the requirements of GB 28050—2011 National standard for nutrition labeling of prepackaged foods. The total selenium content of 8 batches of selenium-enriched rice exceeded the range of 0.04-0.30 mg/kg stipulated in GB/T 22499—2008 Selenium-enriched rice. Two batches of rice contained more than twice the maximum selenium limit. In addition, the proportion of organic selenium in 9 batches of samples was less than 80% of the total selenium content, which did not meet the requirements of DBS 42/002—2014 Requirements for selenium content in organic selenium-rich foods. Conclusion There are some quality problems in the selenium-rich food on the market, such as the total selenium content is not up to standard or exceeding standard, and the proportion of organic selenium is too low. In the samples sampled, 30% of the products' labeled selenium content does not conform to the real value. The unqualified rate of total selenium content and organic selenium proportion in the selenium-rich producing areas is significantly lower than that in the non-selenium-rich producing areas.