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http://dx.doi.org/10.5806/AST.2012.25.3.171

Determination of aromatic amino acids by chemiluminometric assay with Luminol-H2O2-Cu(II) system  

Kim, Kyung-Min (Department of Chemistry, Kyungpook National University)
Kim, Young-Ho (Research Institute of Advanced Energy Technology, Kyungpook National University)
Lee, Sang-Hak (Department of Chemistry, Kyungpook National University)
Publication Information
Analytical Science and Technology / v.25, no.3, 2012 , pp. 171-177 More about this Journal
Abstract
A determination method of aromatic amino acids such as trytophan (Trp), tyrosine (Tyr), and phenylalanine (Phe) using luminol-$H_2O_2$-Cu(II) system has been presented. In the presence of an aromatic amino acid, the enhanced chemiluminescence (CL) intensity of luminol-$H_2O_2$-Cu(II) system was obtained by forming a complex between Cu(II) and the amino acid. Based on the above phenomenon, a sensitive and fast determination of three aromatic amino acids was performed using the CL method in batch-type detection system. To optimize determination conditions, the kinetic influence of an aromatic amino acid on the luminol-$H_2O_2$-Cu(II) system and the effects of $H_2O_2$ and Cu(II) concentration, pH, and buffers were investigated. Under the optimized conditions, the calibration curve was linear over the range from $1.0{\times}10^{-6}$ to $2.0{\times}10^{-5}\;M$ for Trp, $1.0{\times}10^{-6}$ to $2.0{\times}10^{-5}\;M$ for Try, and $2.0{\times}10^{-6}$ to $2.0{\times}10^{-5}\;M$ for Phe, respectively. In this range, reproducibility (RSD, n = 4) of Trp, Try, and Phe were 3.21%, 2.64%, and 2.48%, respectively. The limit of detection ($3{\sigma}/s$) was calculated to be $6.8{\times}10^{-7}\;M$ for Trp, $5.7{\times}10^{-7}\;M$ for Try, and $9.6{\times}10^{-7}\;M$ for Phe.
Keywords
luminol-$H_2O_2$-Cu(II); chemiluminescence; aromatic amino acid;
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