Analysis of drug-membrane interaction by Electron paramagnetic resonance (EPR) spectroscopy (CAT#: STEM-MB-1046-WXH)

Introduction

Generally drugs can act on the level of different biological membranes as well as inside the cells that are limited by membranes. Even in the latter situation, drugs must still interact with the membrane in order to cross it and reach their targets. For this reason, the efficiency of drugs to interact with the membranes constitutes one of the most important pharmacological features playing an essential role in their biological activity. Membranes are the gathering place of many proteins and lipids, and are the structures where most cellular activities occur.

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Principle Applications Procedure Materials Notes Related Products

Principle

Electron Paramagnetic Resonance (EPR), also called Electron Spin Resonance (ESR), is a branch of magnetic resonance spectroscopy which utilizes microwave radiation to probe species with unpaired electrons, such as radicals, radical cations, and triplets in the presence of an externally applied static magnetic field.
EPR spectroscopy is particularly suitable for the investigation of (bio)chemical systems with strongly localized spin density and their interaction with the environment. For these systems EPR provides information on the structure and dynamics and is widely used in chemistry, physics and biology.

Applications

• Study dynamic organisation of lipids in biological membranes, lipid-protein interactions and temperature of transition of gel to liquid crystalline phases.
• Determine oxygen levels in tissues and blood.
• Injection of spin-labeled molecules allows for electron resonance imaging of living organisms.
• EPR can be used to measure microviscosity and micropolarity within drug delivery systems as well as the characterization of colloidal drug carriers.
• The study of radiation-induced free radicals in biological substances (for cancer research).
• Investigation on the antioxidant properties of medicine

Procedure

1. Sample Preparation
2. Electron paramagnetic resonance (EPR) spectroscopy testing
10. Data analysis

Materials

• EPR Spectrometer
• Spectrophotometer

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