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Related Experiment Videos

The sensitive determination of nucleic acids using a fluorescence-quenching method.

Zhen Jia1, Jinghe Yang, Xia Wu

  • 1Key Laboratory of Colloid and Interface Chemistry of the Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China.

Luminescence : the Journal of Biological and Chemical Luminescence
|April 29, 2006
PubMed
Summary

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A new method uses fluorescence quenching to detect nucleic acids. This highly sensitive technique quantifies yeast RNA (yRNA), fish sperm DNA (fsDNA), and calf thymus DNA (ctDNA) at extremely low concentrations.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Fluorescence quenching is a phenomenon where the emission of a fluorophore is reduced.
  • Europium (Eu3+) complexes with ligands like 2-thenoyltrifluoroacetone (TTA) and 1,10-phenanthroline (Phen) exhibit strong luminescence.
  • Nucleic acids are known to interact with and potentially modulate the fluorescence of lanthanide complexes.

Purpose of the Study:

  • To develop a sensitive analytical method for nucleic acid determination.
  • To investigate the fluorescence quenching mechanism of the Eu3+-TTA-Phen system by nucleic acids.
  • To establish the quantitative ranges and detection limits for different types of nucleic acids.

Main Methods:

  • Utilized the Eu3+-TTA-Phen complex as a fluorescent probe.

Related Experiment Videos

  • Investigated the effect of nucleic acids (yeast RNA, fish sperm DNA, calf thymus DNA) on the fluorescence intensity of the complex.
  • Determined the optimal conditions for fluorescence quenching and established calibration curves.

    • Main Results:

    • Nucleic acids effectively quenched the fluorescence of the Eu3+-TTA-Phen system.
    • A linear relationship was observed between quenched fluorescence intensity and nucleic acid concentration within specific ranges.
    • Achieved highly sensitive detection limits: 3.0 x 10(-12) g/mL for yRNA, 4.0 x 10(-12) g/mL for fsDNA, and 5.0 x 10(-11) g/mL for ctDNA.

    Conclusions:

    • The proposed fluorescence quenching method offers high sensitivity for nucleic acid quantification.
    • The interaction mechanism between nucleic acids and the Eu3+-TTA-Phen complex was elucidated.
    • This method represents a significant advancement in sensitive nucleic acid detection techniques.