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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Optoelectronic iron detectors for pharmaceutical flow analysis.

Natalia Rybkowska1, Robert Koncki1, Kamil Strzelak1

  • 1University of Warsaw, Department of Chemistry, Pasteura 1, 02-093, Warsaw, Poland.

Journal of Pharmaceutical and Biomedical Analysis
|July 27, 2017
PubMed
Summary

Economic flow analysis systems using light-emitting diode detectors were developed for iron ion determination. These systems offer efficient and sensitive iron analysis in supplements and drug formulations.

Keywords:
Flow analysisIron determinationOptoelectronic detectorSupplements

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Area of Science:

  • Analytical Chemistry
  • Optoelectronics
  • Environmental Science

Background:

  • Accurate iron ion determination is crucial for health and environmental monitoring.
  • Traditional methods can be costly and time-consuming.
  • Flow analysis systems offer potential for rapid and efficient analysis.

Purpose of the Study:

  • To develop cost-effective flow analysis systems for iron ion determination using light-emitting diode (LED) detectors.
  • To compare the performance of different chromogenic methods for iron detection.
  • To validate the developed systems for real-world applications.

Main Methods:

  • Fabrication of compact flow-through optoelectronic detectors by pairing LEDs.
  • Comparison of three analytical methods using ferrozine, ferene S, and 1,10-phenanthroline chromogens.
  • Flow injection analysis with spectrophotometric detection.

Main Results:

  • All developed systems enabled iron detection in the micromolar range with a sample throughput of 20 injections/hour.
  • Ferrozine and ferene S methods showed higher sensitivity and lower detection limits compared to 1,10-phenanthroline.
  • The linear response range varied among the methods, with 1,10-phenanthroline offering a broader range.

Conclusions:

  • The developed flow analysis systems provide an economical and efficient approach for iron ion determination.
  • The systems are suitable for analyzing iron in dietary supplements and studying iron release from drug formulations.
  • The choice of chromogen impacts sensitivity and linear range, allowing for method selection based on specific application needs.