Optical sensing of copper (II) ions using a biofunctional bolaamphiphile self-assembly

Selective binding of copper (II) ions to tyrosine moieties

Sunhyung Kim, Jinyoung Kwak, Sangyup Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We demonstrate that a photoluminescent self-assembly of tyrosyl bolaamphiphilic molecules functions as a selective chemosensor of Cu 2+ ions. Fluorescence of the photoluminescent self-assembly, which was prepared by association of tyrosyl bolaamphiphilic molecules with Tb 3+ ion and salicylic acid (SA), was sensitively quenched by Cu 2+ ions, facilitating optical detection. Fluorescence spectroscopy analysis of quenching revealed a static quenching mechanism that involved coordination of a Cu2+ ion with the phenol group of a tyrosyl moiety, interfering with the π-π* transition of the phenyl ring. Thus, fluorescence quenching was driven by a reduction in the antenna effect of the tyrosyl moiety as well as by the paramagnetic nature of the Cu2+ ion. XPS spectroscopy results confirmed coordination of the Cu2+ ion with the phenol group. As an optical chemosensor, the photoluminescent tyrosyl bolaamphiphile assembly responded quickly (<1 min) to the addition of Cu 2+ ions, and selectively recognized Cu2+ ions at the ppm level amongst diverse cations with distinguishable fluorescence quenching. The presence of other cations did not interfere with Cu2+ ion recognition, demonstrating the high selectivity of detection. Photoluminescence was recovered after chemical disintegration of Cu2+ ions from the assembly; the tyrosyl bolaamphiphile self-assembly platform presented in this study can therefore function as a reusable optical chemosensor.

Original languageEnglish
Pages (from-to)483-489
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume203
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

tyrosine
Self assembly
Tyrosine
self assembly
Copper
Ions
copper
ions
Quenching
quenching
fluorescence
Fluorescence
Phenol
phenols
Phenols
Cations
assembly
Positive ions
bolaamphiphile
Salicylic acid

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

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title = "Optical sensing of copper (II) ions using a biofunctional bolaamphiphile self-assembly: Selective binding of copper (II) ions to tyrosine moieties",
abstract = "We demonstrate that a photoluminescent self-assembly of tyrosyl bolaamphiphilic molecules functions as a selective chemosensor of Cu 2+ ions. Fluorescence of the photoluminescent self-assembly, which was prepared by association of tyrosyl bolaamphiphilic molecules with Tb 3+ ion and salicylic acid (SA), was sensitively quenched by Cu 2+ ions, facilitating optical detection. Fluorescence spectroscopy analysis of quenching revealed a static quenching mechanism that involved coordination of a Cu2+ ion with the phenol group of a tyrosyl moiety, interfering with the π-π* transition of the phenyl ring. Thus, fluorescence quenching was driven by a reduction in the antenna effect of the tyrosyl moiety as well as by the paramagnetic nature of the Cu2+ ion. XPS spectroscopy results confirmed coordination of the Cu2+ ion with the phenol group. As an optical chemosensor, the photoluminescent tyrosyl bolaamphiphile assembly responded quickly (<1 min) to the addition of Cu 2+ ions, and selectively recognized Cu2+ ions at the ppm level amongst diverse cations with distinguishable fluorescence quenching. The presence of other cations did not interfere with Cu2+ ion recognition, demonstrating the high selectivity of detection. Photoluminescence was recovered after chemical disintegration of Cu2+ ions from the assembly; the tyrosyl bolaamphiphile self-assembly platform presented in this study can therefore function as a reusable optical chemosensor.",
author = "Sunhyung Kim and Jinyoung Kwak and Sangyup Lee",
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TY - JOUR

T1 - Optical sensing of copper (II) ions using a biofunctional bolaamphiphile self-assembly

T2 - Selective binding of copper (II) ions to tyrosine moieties

AU - Kim, Sunhyung

AU - Kwak, Jinyoung

AU - Lee, Sangyup

PY - 2014/1/1

Y1 - 2014/1/1

N2 - We demonstrate that a photoluminescent self-assembly of tyrosyl bolaamphiphilic molecules functions as a selective chemosensor of Cu 2+ ions. Fluorescence of the photoluminescent self-assembly, which was prepared by association of tyrosyl bolaamphiphilic molecules with Tb 3+ ion and salicylic acid (SA), was sensitively quenched by Cu 2+ ions, facilitating optical detection. Fluorescence spectroscopy analysis of quenching revealed a static quenching mechanism that involved coordination of a Cu2+ ion with the phenol group of a tyrosyl moiety, interfering with the π-π* transition of the phenyl ring. Thus, fluorescence quenching was driven by a reduction in the antenna effect of the tyrosyl moiety as well as by the paramagnetic nature of the Cu2+ ion. XPS spectroscopy results confirmed coordination of the Cu2+ ion with the phenol group. As an optical chemosensor, the photoluminescent tyrosyl bolaamphiphile assembly responded quickly (<1 min) to the addition of Cu 2+ ions, and selectively recognized Cu2+ ions at the ppm level amongst diverse cations with distinguishable fluorescence quenching. The presence of other cations did not interfere with Cu2+ ion recognition, demonstrating the high selectivity of detection. Photoluminescence was recovered after chemical disintegration of Cu2+ ions from the assembly; the tyrosyl bolaamphiphile self-assembly platform presented in this study can therefore function as a reusable optical chemosensor.

AB - We demonstrate that a photoluminescent self-assembly of tyrosyl bolaamphiphilic molecules functions as a selective chemosensor of Cu 2+ ions. Fluorescence of the photoluminescent self-assembly, which was prepared by association of tyrosyl bolaamphiphilic molecules with Tb 3+ ion and salicylic acid (SA), was sensitively quenched by Cu 2+ ions, facilitating optical detection. Fluorescence spectroscopy analysis of quenching revealed a static quenching mechanism that involved coordination of a Cu2+ ion with the phenol group of a tyrosyl moiety, interfering with the π-π* transition of the phenyl ring. Thus, fluorescence quenching was driven by a reduction in the antenna effect of the tyrosyl moiety as well as by the paramagnetic nature of the Cu2+ ion. XPS spectroscopy results confirmed coordination of the Cu2+ ion with the phenol group. As an optical chemosensor, the photoluminescent tyrosyl bolaamphiphile assembly responded quickly (<1 min) to the addition of Cu 2+ ions, and selectively recognized Cu2+ ions at the ppm level amongst diverse cations with distinguishable fluorescence quenching. The presence of other cations did not interfere with Cu2+ ion recognition, demonstrating the high selectivity of detection. Photoluminescence was recovered after chemical disintegration of Cu2+ ions from the assembly; the tyrosyl bolaamphiphile self-assembly platform presented in this study can therefore function as a reusable optical chemosensor.

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