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Sampling strategies exploiting multi-pumping flow systems.

João A V Prior1, João L M Santos, José L F C Lima

  • 1CEQUP/Departamento de Química-Física, Faculdade de Farmácia da Universidade do Porto, Rua Aníbal Cunha 164, 4050, Porto, Portugal.

Analytical and Bioanalytical Chemistry
|May 7, 2003
PubMed
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New multi-pumping flow systems utilize precise syringe pumps for improved sample and reagent mixing. This enhances spectrophotometric analysis of isoniazid in pharmaceuticals, achieving high reproducibility and throughput.

Area of Science:

  • Analytical Chemistry
  • Flow Injection Analysis

Background:

  • Traditional multi-pumping flow systems often face limitations in precise sample and reagent handling.
  • Optimizing mixing efficiency is crucial for accurate spectrophotometric determinations.

Purpose of the Study:

  • To develop and evaluate novel multi-pumping flow systems using syringe pumps for enhanced analytical performance.
  • To assess the effectiveness of different sample-insertion strategies for isoniazid determination.

Main Methods:

  • Implementation of multi-pumping flow systems with syringe pumps capable of 1-4 microL pulses.
  • Utilisation of binary sampling and spectrophotometry for isoniazid determination.
  • Comparison of single sample volume, merging zones, and binary sampling strategies.

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Main Results:

  • Syringe pumps provide highly reproducible flow streams and simplified computer control.
  • Binary sampling with 1 microL pulses achieved enhanced sample/reagent mixing, even under limited dispersion.
  • Linear calibration plots up to 18.0 microg mL(-1) were obtained with <1.48% RSD and ~20 samples/hour throughput.

Conclusions:

  • The developed multi-pumping flow system with syringe pumps offers a robust and efficient platform for pharmaceutical analysis.
  • Binary sampling strategy significantly improves mixing efficiency and analytical accuracy.
  • The system demonstrates high precision, reproducibility, and throughput for isoniazid determination.