铜藻中无机元素的含量分析与食用安全评价

分别运用电感耦合等离子体发射光谱法和电感耦合等离子体质谱法分析2018年10—12月采集于浙江、山东和辽宁沿海海域的铜藻样品中5种常量元素、14种微量元素以及16种稀土元素的含量,分析铜藻中As的形态,以阐明铜藻中无机元素的含量及其分布特征和食用安全性。结果显示,5种常量元素中,K的平均含量最高,为6.95×10^4 mg/kg(干质量),其次为Na的平均含量,达3.08×10^4 mg/kg,而P的平均含量最低,仅有0.15×10^4 mg/kg;对14种微量元素分析表明,铜藻含有丰富的Fe(889.12~1164.17 mg/kg)和Sr(1001.76~2010.13 mg/kg);Cd和Pb的含量很低,食用风险较低;铜藻中的砷主要以无机砷酸盐As(Ⅴ)形态存在,占总As含量的70%以上,食用风险较高。铜藻中总稀土元素含量为2.77~6.49 mg/kg,其中轻稀土元素的含量约为重稀土元素的2.0~2.5倍。综上,铜藻含有丰富的无机营养元素和稀土元素,具有较高的营养与医药保健价值。

Analysis of Inorganic Elements and Food Safety in Seaweed Sargassum horneri

Inductively coupled plasma emission spectrometry(ICP)and inductively coupled plasma mass spectrometry(ICP-MS)were used to analyze the contents of 5 kinds of macroelements,14 kinds of trace elements and 16 kinds of rare elements in seaweed Sargassum horneri samples collected in the coastal waters of Zhejiang,Shandong and Liaoning provinces from October to December 2018 to probe for the form of arsenic and the contents and distribution characteristics of inorganic elements and their food safety in the seaweed.Results showed that 5 macroelements were detected in the sea weed,with the maximal average concentration of 6.95×10^4(dry weight)in K,followed by Na(average level of 3.08×10^4 mg/kg)and the minimal in P(0.15×10^4 mg/kg).Analysis of 14 microelements revealed that the seaweed was rich in Fe(889.12—1164.17 mg/kg)and Sr(1001.76—2010.13 mg/kg),with very low concentration of Cd and Pb,thus low risk to the consumer.The inorganic arsenate(AsⅤ)was shown to be the main arsenic type in the seaweed,accounting for 70%in the total arsenic for all samples,and very high food safety risk to the consumer.The Concentration of the total rare earth elements in the seaweed was 2.77—6.49 mg/kg,and the concentration of the light rare earth elements was about 2.0—2.5 times of the heavy rare earth elements.In conclusion,the brown seaweed was rich in helpful inorganic elements and rare earth elements,which made the seaweed with a high nutritional value and high medical health care function.The findings provided valuable information for the further development and utilization of seaweed S.horneri in the food,medical health care,feed and other fields.