J. Fujisawa, N. Kikuchi, M. Hanaya
Nov 1, 2016
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24
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Journal
Chemical Physics Letters
Abstract
Abstract L-tyrosine (Tyr) plays a crucial role as a proteinogenic amino acid and also as a precursor to several neurotransmitters and hormones. Here we demonstrate coloration of Tyr based on organic-semiconductor interfacial charge-transfer (ICT) transitions. The ICT transitions from Tyr to TiO 2 are induced by the chemisorption of Tyr on TiO 2 surfaces via the hydroxy group of the phenol moiety. Because other amino acids possess no chemical group to induce ICT transitions, this coloration method enables to detect Tyr selectively without drastic structural change in contrast to the conventional coloration methods.