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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Luminescence Resonance Energy Transfer to Study Conformational Changes in Membrane Proteins Expressed in Mammalian Cells
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Luminescence switching by hybridization-directed mixed lanthanide complex formation.

Ulla Karhunen1, Lumi Jaakkola, Qi Wang

  • 1Department of Biotechnology, University of Turku, Tykistokatu 6 A 6th floor, FI-20520 Turku, Finland. umskar@utu.fi

Analytical Chemistry
|December 19, 2009
PubMed
Summary

We created a new assay using separated lanthanide chelate components for sensitive DNA detection. This method offers a low background signal, crucial for accurate oligonucleotide hybridization analysis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Assay Development

Background:

  • Lanthanide chelates are widely used in luminescence assays.
  • Developing homogeneous assays with low background is challenging.
  • Oligonucleotide-based detection requires specific and sensitive methods.

Purpose of the Study:

  • To develop a novel homogeneous assay for DNA detection.
  • To utilize separated lanthanide chelate components for enhanced signal generation.
  • To conjugate these components to oligonucleotide probes for target recognition.

Main Methods:

  • Designing and synthesizing two distinct molecules: a lanthanide ion carrier and a light-absorbing component.
  • Conjugating these separated moieties to oligonucleotide probes.
  • Utilizing the probes in a homogeneous assay to detect complementary target DNA.

Main Results:

  • Successful formation of a luminescent mixed chelate complex upon probe binding.
  • Achieved a very low background signal in the assay.
  • Demonstrated that the signal is highly dependent on adjacent probe hybridization to the target DNA.

Conclusions:

  • The developed assay is a sensitive and specific method for DNA detection.
  • Separating lanthanide chelate components enables a low-background homogeneous assay.
  • This approach is promising for oligonucleotide-based diagnostics and research.