ビタミン
Online ISSN : 2424-080X
Print ISSN : 0006-386X
ビタミンB_1類の安定性にかんする研究 : (VI)アスコルビン酸共存時のO, S-bis(Ethoxycarbonyl)thiamineの定量
稲津 邦平森田 節子砂川(中西) 成代山本 隆一
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1968 年 37 巻 6 号 p. 563-568

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It was found that the percentage recovery of O, S-bis (ethoxycarbonyl) thiamine (DCET) was decreased by the presence of ascorbic acid (AsA) when DCET was determined by the thiochrome method after preliminary treatment with alkali. This alkali-method was also interfered by hydroquinone and other compounds susceptible to oxidation. An explanation is proposed for the interference by AsA that DCET is converted by the alkali-treatment into thiochrome reaction-positive compounds, which are successively oxidized to thiamine disulfide (TDS) by the presence of AsA. This was supported by the fact that TDS was detected in the reaction mixture when DCET was treated with alkali in the presence of AsA. DCET can be determined without any interference when cysteine is preliminarily added before the alkali treatment to the sample solution containing DCET and AsA. Other methods for the determination of DCET in the presence of AsA are discussed.

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© 1968 日本ビタミン学会

この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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