Effect of Ligand Structures for Determination of Histidine Using Dinuclear Copper (II) Complexes with Anthracene Derivative Ligands by Indicator Displacement Assay Approach

Authors

  • Sarayut Watchasit ภาควิชาเคมี คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย
  • Thawatchai Tuntulani ภาควิชาเคมี คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย
  • Chomchai Suksai ศูนย์ความเป็นเลิศด้านนวัตกรรมทางเคมี ภาควิชาเคมี คณะวิทยาศาสตร์ มหาวิทยาลัยบูรพา

Abstract

The formation of the ensembles between dinuclear copper (II) complexes of anthracene derivative ligands, Cu2L1 and Cu2L2, with fluorescence indicator Eosin Y was studied, aiming to employ the ensembles to detect histidine (His) by using an indicator displacement assay approach (IDAs). Experiments were carried out in 80/20 (%v/v) MeCN/H2O in the presence of 0.01 M HEPES buffer at pH 7.4. The ensemble formation constants (log K) of Cu2L1 and Cu2L2 with Eosin Y were calculated to be 3.82 ± 0.25 and 4.91 ± 0.33, respectively. Interestingly, it was found that only Cu2L2 ensemble could detect His selectively, whereas the Cu2L1 ensemble could respond to other amino acids. Thus, Cu2L2 can be used as a receptor to determine His with fluorescence indicator Eosin Y as                            a signaling unit under an indicator displacement assay approach. Keywords :  dinuclear copper (II) complexes,  indicator displacement assay,  anthracene derivative ligands,                 histidine amino acid, fluorescence sensor

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Published

2016-10-10