Extraction Equilibria of Amino Acids by Di(2-ethyl hexyl) Phosphoric Acid in n-Heptane Solutions.

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  • Takahashi Masahiro
    Department of Industrial Chemistry, Suzuka National College of Technology
  • Tani Fumiyo
    Department of Industrial Chemistry, Suzuka National College of Technology Toyohashi University of Technology
  • Kawai Yuuko
    Department of Industrial Chemistry, Suzuka National College of Technology Wako Jyunyaku Co., Ltd.
  • Takeuchi Hiroshi
    Department of Industrial Chemistry, Suzuka National College of Technology Nagoya University

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Other Title
  • ジ（２‐エチルヘキシル）リン酸のｎ‐ヘプタン溶液によるアミノ酸の抽出平衡
  • ジ 2 エチルヘキシル リンサン ノ n ヘプタン ヨウエキ ニヨル アミノサ

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The extraction equilibria of six kinds of amino acids with di (2-ethylhexyl) phosphoric acid (D 2 EHPA) dissolved in n-heptane were studied at 298.2 K in the low pH range (25). The distribution ratios of amino acid D+ as the cationic species were inversely proportional to the 1 st power of the concentration of hydrogen ion, and directly to the 0.5 th power of the concentration of D 2 EHPA. The extraction equilibrium constants Kex of the amino acids used were 0.650 (Phe), 0.420 (Trp), 0.320 (Leu), 0.275 (Met), 0.064 (Gly) and 0.040 (Ala) mol0.5·m-1.5. The highest Kex value was obtained for Phe, being larger than the value for Ala by a factor of about 16. It was found that the extraction equilibrium constants of amino acids increase with increasing hydrophobicity.

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