坛紫菜中铝的形态分析及风险性评价

Speciation analysis and health risk assessment of aluminum in Porphyra haitanensis

应用化学连续萃取法结合电感耦合等离子体质谱(ICP-MS)法对紫菜中铝的存在形态进行了初步研究,并对紫菜中铝食用安全性进行了评价。所测30份紫菜样品中铝的总含量范围为74.3～1 479 mg/kg,紫菜中铝的形态存在难溶态>有机态>无机态>水溶性游离态的分布规律。约75%的铝以难溶态存在。可溶态的铝主要以有机铝的形态存在,有机铝占总可溶态铝的72%左右。无机铝主要以Al(OH)3的形态存在,水溶性游离态铝占无机铝的18.5%。通过模拟胃肠消化环境测定紫菜中铝的溶出率,结果表明,模拟胃液可溶出的铝占总铝的1.38%～6.80%,说明大部分铝在人体消化过程中不易溶出,对人体的潜在危害并不大。

The speciation analysis and health risk assessment of aluminum in Porphyra haitanensis was carried out by sequential chemical extraction method and analyzed by inductively coupled plasma mass spectrometry（ICP-MS）.The total content of aluminum was within the limits of 74.3-1 479 mg/kg in 30 samples.The content distribution of aluminum species in P.haitanensis was according to the order of insoluble Alorganic Alinorganic Alwater soluble Al.Insoluble aluminum in P.haitanensis accounted for about 75% of the total Al.The greatest amount of soluble aluminum existed as organic Al,which accounted for 72% of the total soluble aluminum.The dominating form of inorganic aluminum was Al（OH）3 and water soluble aluminum only accounted for 18.5% of inorganic aluminum.The percentage of dissolved aluminum in gastric stage only accounted for 1.38%-6.80% of the total aluminum,which indicated most of aluminum was insoluble during digestion process and health risk of aluminum which come from P.haitanensis was low.