Determination of pH in reversed micelles.

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概要

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• A new method for the determination of pH in reversed micellar systems was proposed. The degree of dissociation (α) of Phenol Red in the systems was observed spectrophotometrically. The value of pH can be obtained by use of the Henderson-Hasselbach equation with the aid of p<I>K</I><SUB>a</SUB> of Phenol Red measured by means of <SUP>31</SUP>P-NMR in the systems containing phosphate buffer solutions. The method was applied to systems consisting of sodium octanoate, 1-hexanol, and water and some buffer solutions other than phosphate buffer solutions, and found to be effective within a wide pH range. Analysis of the fluorescence spectra of 8-anilino-1-naphthalene-sulfonic acid indicates that Phenol Red molecules are present at the interface between the water core and the 1-hexanol phase in reversed micelles. The hydrolytic reaction of <I>p</I>-nitrophenyl acetate was also studied kinetically and found to change slightly with pH.

• 公益社団法人 日本化学会の論文

著者

• Fujii Hirotada

  Department Of Inflammation Research The Tokyo Metropolitan Institute Of Medical Science (rinshoken)

• Kawai Tohru

  Department Of Bioscience And Biotechnology Faculty Of Agriculture Shinshu University

• Nishikawa Hiroyasu

  Department Of Physiology Meiji University Of Oriental Medicine

• Fujii Hirotada

  Department of Polymer Technology, Tokyo Institute of Technology, Ookayama

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