Microscopic Imaging of Chiral Amino Acids in Agar Gel through Circularly Polarized Luminescence of Eu III Complex

We recently found that [Eu(pda) ] (pda: 1,10-phenanthroline-2,9-dicarboxylic acid), which has an achiral structure in crystals, exhibits circularly polarized luminescence (CPL) in aqueous solutions containing chiral amino acids such as arginine and histidine. CPL measurements were performed for agar...

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Bibliographic Details
Published in:Chemistry, an Asian journal an Asian journal, 2020-01, Vol.15 (1), p.85-90
Main Authors: Koike, Hikaru, Nozaki, Koichi, Iwamura, Munetaka
Format: Article
Language:English
Subjects:
Agar - chemistry
Arginine - analysis
Coordination Complexes - chemistry
Europium - chemistry
Gels - chemistry
Histidine - analysis
Hydrogen-Ion Concentration
Luminescent Measurements - instrumentation
Molecular Structure
Phenanthrolines - chemistry
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Summary:We recently found that [Eu(pda) ] (pda: 1,10-phenanthroline-2,9-dicarboxylic acid), which has an achiral structure in crystals, exhibits circularly polarized luminescence (CPL) in aqueous solutions containing chiral amino acids such as arginine and histidine. CPL measurements were performed for agar gel, which includes an aqueous solution of [Eu(pda) ] and chiral arginine or histidine. The spectral shape, concentration, and pH dependences on CPL intensity in the agar gels were very close to those in aqueous solutions, indicating that the CPL of the Eu complex in the agar gels was induced by mechanism similar to that in aqueous solutions. We performed spatially resolved CPL measurements using a laboratory-built microscopic CPL spectroscopic system for agar-gel samples, where d- and l- amino acids were separately dispersed. We successfully recorded CPL imaging maps showing spatial dispersions of d- and l-amino acid in the agar gels.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.201901495