Ion-selective electrodes based on L-tryptophan and L-tyrosine.

Takayo Moriuchi-Kawakami, Yu Tokunaga, Hiroyuki Yamamoto, Yasuhiko Shibutani

Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1Omiya, Asahi, Osaka 535-8585, Japan. kawakami@chem.oit.ac.jp

Talanta 2012 May 30

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Novel ion-selective electrodes (ISEs) based on amino acids have been developed. L-Tryptophan and L-tyrosine, which are amino acids, are employed as ionophores for solvent polymeric membrane electrodes. The proposed ISEs show rapid Nernstian responses for the Cu(2+) ion over the concentration ranges of 3.0×10(-4)-1.0×10(-1) M. These ISEs exhibit comparatively good selectivity with respect to alkaline, alkaline earth, and some transition and heavy metal ions and the ammonium ion. The ISE based on tryptophan also indicates the Nernstian response for the benzylammonium ion. Copyright © 2012 Elsevier B.V. All rights reserved.

Citation

Takayo Moriuchi-Kawakami, Yu Tokunaga, Hiroyuki Yamamoto, Yasuhiko Shibutani. Ion-selective electrodes based on L-tryptophan and L-tyrosine. Talanta. 2012 May 30;94:99-103