George Graham N, Prince Roger C, Singh Satya P, Pickering Ingrid J
Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada.
Mol Nutr Food Res. 2009 May;53(5):552-7. doi: 10.1002/mnfr.200800028.
It is well known that seafood contains high levels of arsenic. For marine animals arsenic is predominantly present as arsenobetaine and related compounds which are not metabolized and are thought to present no toxic hazard to humans. With edible seaweeds, arsenic is present in different forms, of which arsenosugars are the best known. These species may be metabolized by mammals, and the high arsenic contents of these materials represent a significant environmental source for human exposure to arsenicals in some populations. In this work, we explore the utility of As K-edge X-ray absorption near-edge spectroscopy as an in situ probe of the chemical forms of arsenic in seaweeds. We find that three different chemical types of arsenic are present, consistent with arsenate, an arsenosugar or tetra-alkyl-arsonium species, and a trivalent arsenic species.
众所周知，海鲜含有高水平的砷。对于海洋动物来说，砷主要以砷甜菜碱及相关化合物的形式存在，这些化合物不会被代谢，并且被认为对人类没有毒性危害。对于可食用海藻，砷以不同形式存在，其中砷糖最为人所知。这些物质可能会被哺乳动物代谢，并且这些材料中高含量的砷在某些人群中是人类接触砷化合物的一个重要环境来源。在这项工作中，我们探索了砷K边X射线吸收近边光谱作为海藻中砷化学形态原位探针的效用。我们发现存在三种不同化学类型的砷，与砷酸盐、一种砷糖或四烷基砷鎓物种以及一种三价砷物种一致。
