ICP-MS法测定甘薯、甘薯茎、叶中微量元素
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摘要
甘薯、甘薯茎、叶均含有丰富的微量元素,药用价值和营养价值极高。试验采用微波消解样品,应用ICP-MS法测定甘薯、甘薯茎、叶中10种微量元素(Ca、Cd、Cr、Fe、K、Mg、Mn、Na、Se和Zn)的含量。此方法简便、快捷、灵敏度高、准确性好,方法检出限(n=6)为0.001 2～0.223 8 mg/kg,此方法回收率为95.4%～118.1%,平行测定6次的相对标准偏差小于1.32%。试验结果表明,板栗薯中对人体有益的微量元素含量更高,尤其是紫薯茎中硒元素含量丰富,但同时也发现甘薯中含有少量的有害重金属,这可能与其生长土壤受到污染有关。
Sweet potato, sweet potato stems and leaves were rich in trace elements, whose nutritional value and medicinal value are extremely high. The sample was digested by microwave. The contents of 10 trace elements(Ca, Cd, Cr, Fe, K, Mg, Mn, Na, Se, and Zn) in sweet potato, sweet potato stem and leaf were determined by ICP-MS. The method was simple, fast, sensitive and accurate. Detection limits of the method(n=6) were between 0.001 2 mg/kg and 0.223 8 mg/kg. The recovery rate of this method was 95.4%-118.1%. The relative standard deviation of 6 parallel determination was less than 1.32%. The results showed that the content of trace elements beneficial to human body was higher in chestnut potato, especially the content of selenium in purple sweet potato stems was rich, but it was also found that sweet potato contains a small amount of harmful heavy metals, which might be related to the contamination of its growing soil.
Sweet potato, sweet potato stems and leaves were rich in trace elements, whose nutritional value and medicinal value are extremely high. The sample was digested by microwave. The contents of 10 trace elements(Ca, Cd, Cr, Fe, K, Mg, Mn, Na, Se, and Zn) in sweet potato, sweet potato stem and leaf were determined by ICP-MS. The method was simple, fast, sensitive and accurate. Detection limits of the method(n=6) were between 0.001 2 mg/kg and 0.223 8 mg/kg. The recovery rate of this method was 95.4%-118.1%. The relative standard deviation of 6 parallel determination was less than 1.32%. The results showed that the content of trace elements beneficial to human body was higher in chestnut potato, especially the content of selenium in purple sweet potato stems was rich, but it was also found that sweet potato contains a small amount of harmful heavy metals, which might be related to the contamination of its growing soil.
引文
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[2]徐娟,郑志锋,刘祥义,等.ICP-AES法同时测定6种薯类作物中无机元素[J].食品工业,2016,37(12):255-257.
[3]贾翠英,欧行奇,李新华.9种叶菜型甘薯叶·茎·柄中蛋白质及矿物质含量分析[J].安徽农业科学,2010,38(35):19968-19970.
[4]陈新,周宏,柳闽生,等.电感耦合等离子体质谱法测定紫甘薯中痕量元素[J].理化检验(化学分册),2010,46(12):1397-1399.
[5]MELNIKOV P,C?NSOLO F Z,ZANONI L Z,et al.Trace elements in common potatoes,sweet potatoes,cassava,yam and taro[J].International Journal of Medicinal Plants and Natural Products(IJMPNP),2016,2(2):8-12.
[6]吴艳兵,颜振敏,韩伟元,等.ICP-AES测定山药中微量元素[J].光谱实验室,2011,28(2):842-845.
[7]胡青,王莹,高倩倩,等.ICP-AES测定山药与红薯中的微量元素[J].沈阳师范大学学报(自然科学版),2011,29(4):553-555.
[8]DUAN L,ZHANG Y,TANG M,et al.Determination of Trace Elements in Copper and Iron Sweet Potato[J].Guangdong Trace Elements Science,2014,159(9):2275-2282.