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Related Concept Videos

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Integration of Miniaturized Solid Phase Extraction and LC-MS/MS Detection of 3-Nitrotyrosine in Human Urine for Clinical Applications
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Liquid-Liquid Extraction and Solid Phase Extraction for Urinary Organic Acids: A Comparative Study from a Resource

Chandrawati Kumari1, Bijo Varughese1, Siddarth Ramji2

  • 1Pediatrics Genetic and Research Laboratory, Department of Pediatrics, New Medical Block, Opposite Old Casualty, Lok Nayak Hospital, Maulana Azad Medical College, New Delhi, 110002 India.

Indian Journal of Clinical Biochemistry : IJCB
|September 9, 2016
PubMed
Summary

Solid phase extraction (SPE) offers higher metabolite recovery and isolation for organic acid analysis compared to liquid-liquid extraction (LLE). However, LLE is more economical for resource-constrained settings.

Keywords:
Gas chromatography mass spectrometryLiquid–liquid extractionOrganic acidemiaSolid phase extractionUrinary organic acids

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Area of Science:

  • Clinical Chemistry
  • Analytical Chemistry
  • Metabolomics

Background:

  • Accurate detection of organic acids is vital for diagnosing organic acidemias using Gas Chromatography-Mass Spectrometry (GC-MS).
  • The pre-analytical extraction process significantly impacts the accuracy of GC-MS analysis for organic acids.
  • Solid phase extraction (SPE) and liquid-liquid extraction (LLE) are common methods employed globally in metabolic laboratories.

Purpose of the Study:

  • To compare the precision, accuracy, and efficiency of SPE versus LLE for organic acid extraction.
  • To evaluate metabolite recovery, number of isolated metabolites, time, and cost in a resource-constrained environment.
  • To determine the most practical extraction method for organic acid analysis under economic limitations.

Main Methods:

  • Comparative study of two extraction techniques: Solid Phase Extraction (SPE) and Liquid-Liquid Extraction (LLE).
  • Evaluation parameters included precision, accuracy, percent recovery, number of metabolites, processing time, and cost.
  • Analysis conducted in a resource-constrained laboratory setting.

Main Results:

  • Solid phase extraction (SPE) demonstrated a significantly higher mean recovery rate (84.1%) compared to LLE (77.4%) (p < 0.05).
  • SPE isolated a greater average number of metabolites (161.8 ± 18.6) than LLE (140.1 ± 20.4).
  • Liquid-liquid extraction (LLE) proved to be more economical in terms of processing cost.

Conclusions:

  • SPE provides superior recovery and isolation of metabolites for organic acid analysis.
  • LLE is a more cost-effective option, making it a practical choice for organic acid analysis in resource-limited settings.
  • The choice between SPE and LLE depends on laboratory resources and analytical priorities.