洗剤の成分分析に関する研究 (第5報) : シフト試薬を用いたNMRスペクトル法による洗剤中のアルコールサルフェートおよびアルコールエトキシサルフェートの定量

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Determination method for the mixture of alcohol sulfate (AS) and alcohol ethoxysulfate (AES) was investigated by means of NMR spectroscopy using shift reagents. In the NMR spectrum of mixture of AS and AES in deutelized acetic acid, each methylene protons adjacent to sulfate radical indicated the signals at somewhat different position but slightly overlap. In the NMR spectrum of alcohol and alcohol ethoxylate yielded from hydrolysis of AS and AES, there were no signals for determination because of their overlap. But, the addition of Eu (DPM) 3 to alcohol and alcohol ethoxylate caused low magnetic field shift in different manner. And, methylene proton under β-position of alcohol indicated as an isolated signal by the addition of suitable amount of Eu (DPM) 3. Therefore, alcohol and alcohol ethoxylate were determined from NMR spectrum using the ratio of signal areas among methylene of alcohol and duplicated methyl of alcohol and alcohol ethoxylate.
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