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Related Experiment Videos

Fluorescence assay based on preconcentration by a self-ordered ring using berberine as a model analyte.

Ying Liu1, Cheng Zhi Huang, Yuan Fang Li

  • 1Institute of Environmental Chemistry, College of Chemistry and Chemical Engineering, Southwest Normal University, Chongqing, China.

Analytical Chemistry
|November 16, 2002
PubMed
Summary

A new method uses capillary flow to create fluorescent self-ordered rings (SORs) for detecting trace analytes. This assay can accurately quantify berberine in tablets and urine, even at femtomole levels.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Accurate detection of trace fluorescent analytes is crucial for various scientific applications.
  • Existing methods for analyte detection can be complex and require specialized equipment.
  • Capillary-driven self-assembly offers a promising route for developing novel analytical techniques.

Purpose of the Study:

  • To develop a novel, sensitive assay for trace fluorescent analytes using self-ordered ring formation.
  • To investigate the formation and characteristics of self-ordered rings (SORs) generated by capillary flow.
  • To demonstrate the assay's capability for quantifying a model analyte, berberine, in real-world samples.

Main Methods:

  • A sessile droplet containing a fluorescent analyte was evaporated on a hydrophobic glass slide.

Related Experiment Videos

  • Outward capillary flow during evaporation induced the self-assembly of the analyte into a ring structure.
  • Digital imaging and CCD camera analysis were used to characterize the SORs and their fluorescent intensity.
  • The assay was validated by monitoring berberine content in tablets and human urine samples.

    • Main Results:

    • Self-ordered rings (SORs) with controlled dimensions were successfully formed from fluorescent analytes.
    • The distribution of berberine molecules within the SOR belt followed a Gaussian distribution.
    • Maximum fluorescent intensity (Imax) showed a linear relationship with berberine content down to the femtomole level.
    • The assay provided satisfactory monitoring of berberine in pharmaceutical tablets and human urine.

    Conclusions:

    • The proposed capillary-driven self-assembly assay is a sensitive and effective method for detecting trace fluorescent analytes.
    • The formation of SORs provides a robust platform for quantitative analysis of analytes like berberine.
    • This technique holds potential for applications in pharmaceutical analysis and pharmacokinetic studies.