Studies on the Chemical Forms of Arsenic in Some Sea Foods and in Urine after Ingestion of These Foods

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  • 数種の海産食品中のヒ素の存在形態とそれら食品摂取後の尿中ヒ素代謝物について
  • スウシュ ノ カイサン ショクヒンチュウ ノ ヒソ ノ ソンザイ ケイタイ ト

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Abstract

Analysis of total As and some As components (As (III), As (V), monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA) in sea foods [Hijiki (Hizikia fusiforme), Konbu (Laminaria japonica), dried shrimp and flat fish (Kareius bicoloratus)] and in urine after ingestion of these foods were carried out by the following methods: the BAL chelate method (As (III), As (V) and MMAA), the ECD-GC method (DMAA) and the wet digestion with Ni2+ and graphite furnace atomic absorption method (total As).<br>Most of As (more than 90%) in aqueous extracts of Konbu, shrimp and flat fish exists in unidentified bound forms with organic compounds, i. e., not as inorganic or methylated arsenic. A large portion of As (more than 80%) in Hijiki is present as inorganic arsenate and arsenite (60% and 20%, respectively) or as substances releasing inorganic arsenicals in acid media.<br>Excretion patterns of As in urine after ingestion of these sea foods were as follows: in the case of Hijiki, a large part of As (more than 40% of total excreted As) is excreted as DMAA, while in the case of Konbu, DMAA accounted for most of the excreted arsenic.<br>On the other hand, in the case of shrimp and flat fish, over 50% of As is excreted as unidentified bound forms with organic compound (s). The As in these foods, except for Hijiki, is rapidly excreted in urine (within 40hr after eating), but prolonged excretion is observed in the case of Hijiki. This may be due to the high inorganic As content in Hijiki.<br>The As excretion ratios of Hijiki, shrimp and flat fish in urine are 51%, 47.4% and 24.2%. These values suggest that other As components may be incorporated in the body and/or excreted by other routes (in the feces and by expiration).<br>Furthermore, As components in shrimp were fractionated. An As-containing fraction from dried shrimp appears to be an arseno-oligopeptide, since the fraction gave a positive ninhydrin reaction and yielded arsenobetaine upon acid hydrolysis.

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