海藻中铝的化学形态分析

首次对我国主要养殖海藻中的总铝含量进行调查,结果显示海藻中总铝含量差异很大,含量在53.2～2714.6 mg/kg,其中坛紫菜中总铝含量最高。利用连续平衡静态浸提法研究了海带和紫菜中铝的化学形态。研究结果表明,海藻中铝存在多种形态,主要以稳定的、不易被生物体吸收的有机铝(AlONL)形态存在,占总铝的82.0%~87.6%,而毒性较高的无机态铝含量很低,占3.75%～4.94%。本实验进一步证明,以总铝含量作为评价海藻铝食用安全的评价标准具有一定局限性,亟需针对不同形态铝建立不同限量标准,对海藻及其制品进行科学的食用安全评价,以保障海藻产业顺利发展。

Speciation analysis of aluminium in seaweed

The aluminum content in seaweed was first researched in out country.The results showed that the aluminum content ranged from 53.2 mg/kg to 2 714.6 mg/kg,especially for laver which had highest average value.The speciation analysis of aluminum was first conducted in seaweed using sequential chemical extraction.There were several forms of aluminum in seaweed and the main speciation was organic aluminum which was stable and not easy to be absorbed by organism.It accounted for 82.5%-87.6% of the total aluminum.The inorganic aluminum which had higher toxicity accounted for only 3.75%-4.94% of the total amount.The present research further proved that it was not enough to use total aluminum as the standard to evaluate the safety of the seaweed,and it was urgent to establish different limitation standards according to different aluminum speciation in order to accurately evaluate the safety of the seaweed and guarantee the healthy development of the seaweed industry.