Survey on the Quality of Commercial Nigari (Crude Magnesium Chloride [Sea Water])

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  • 市販にがり（粗製海水塩化マグネシウム）の品質調査
  • シハン ニ ガリ ソセイ カイスイ エンカ マグネシウム ノ ヒンシツ チョウサ
  • 情報ひろば 受賞者講演の概要 食品から検出された農薬等の分解物に関する食品衛生学的研究(平成18年度日本食品衛生学会学術貢献賞)
  • ジョウホウヒロバ ジュショウシャ コウエン ノ ガイヨウ ショクヒン カラ ケンシュツ サレタ ノウヤク トウ ノ ブンカイブツ ニ カンスル ショクヒン エイセイガクテキ ケンキュウ ヘイセイ 18ネンド ニホン ショクヒン エイセイ ガッカイ ガクジュツ コウケンショウ

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Contents of minerals (Mg, Ca, Na and K), anions (SO42-, Br- and Cl-) and heavy metals (Pb, Cd, Zn, Hg and As) were determined in 17 commercial samples of Nigari, 15 samples of crude magnesium chloride (sea water) products as a food additive and 2 magnesium-containing foods. Obtained values were compared with the specifications proposed in a draft of the eighth edition of Japan's Specifications and Standards for Food Additives. Out of 15 food additive samples, only 5 samples satisfied the specification. Since the Joint FAO/WHO Expert Committee on Food Additives (JECFA) proposed to lower the limits of heavy metals in food additives, a simple method was developed for the determination of low levels of Pb and Cd by extracting chelates of these metals with organic solvents. The quantification limits for Pb and Cd were 0.5 μg/g and 0.05 μg/g, respectively. It was estimated from the SO42-/Ca ratios that 15 samples were sea water evaporation products, and the remaining 2 were ion-exchange membrane process products. No pollution with heavy metals was found in any of the samples.

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