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| Analysis of Inorganic Elements and Food Safety in Seaweed Sargassum horneri |
| ZHAO Yanfang, SHANG Derong, KANG Xuming, ZHAI Yuxiu, WANG Lianzhu, SHENG Xiaofeng, DING Haiyan |
| Key Laboratory of Testing and Evaluation for Aquatic Product Safety and Quality, Ministry of Agriculture and Rural Affairs; Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China |
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Abstract 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 6.95×104 (dry weight) in K, followed by Na (average level of 3.08×104 mg/kg) and the minimal in P (0.15×104 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.
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Received: 23 August 2019
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