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Related Experiment Video

Updated: Jun 21, 2026

A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2
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A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2

Published on: September 26, 2025

Sequential injection system for phospholipase A2 activity evaluation: studies on liposomes using an

André R T S Araujo1, Diana Gaspar, Marlene Lúcio

  • 1REQUIMTE, Serviço de Química-Física, Faculdade de Farmácia da Universidade do Porto, Rua Aníbal Cunha, 164, 4099-030 Porto, Portugal.

Talanta
|July 21, 2009
PubMed
Summary

This study introduces a new automated method using a fluorescent probe to measure phospholipase A2 (PLA2) activity and its inhibition by NSAIDs. The system offers a faster and more efficient way to assess enzyme activity and drug effects.

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Published on: March 14, 2021

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Pharmacology

Background:

  • Phospholipase A2 (PLA2) plays a crucial role in biological processes and disease.
  • Assessing PLA2 activity and its inhibition is important for drug discovery and development.
  • Existing methods for PLA2 activity assessment can be time-consuming and complex.

Purpose of the Study:

  • To develop an automated, efficient, and rapid methodology for evaluating PLA2 activity.
  • To assess the inhibitory effects of non-steroidal anti-inflammatory drugs (NSAIDs) on PLA2.
  • To utilize 1-anilinonaphthalene-8-sulfonate (ANS) as a fluorescent probe in a sequential injection analysis (SIA) system.

Main Methods:

  • Development of an automated SIA system incorporating ANS as a fluorescent probe.
  • Utilizing liposomes as a substrate for PLA2-mediated hydrolysis.
  • Optimization of reaction conditions, including substrate and probe concentrations, and incubation times.
  • Evaluation of PLA2 inhibition by NSAIDs (meloxicam, tolmetin, ibuprofen) and alpha-lipoic acid.

Main Results:

  • The SIA system successfully detected hydrophobic environment shifts caused by PLA2 activity.
  • PLA2 activity was effectively inhibited by the tested NSAIDs and alpha-lipoic acid.
  • Optimized reaction conditions ensured accurate and reproducible measurements.
  • Results from the automated method correlated well with traditional batch procedures.

Conclusions:

  • The developed automated SIA methodology provides a highly efficient and rapid approach for PLA2 activity assessment.
  • This method is suitable for evaluating the inhibitory potential of compounds like NSAIDs against PLA2.
  • The system offers precise control over reaction parameters, enhancing analytical reliability.