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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

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Published on: May 13, 2017

Singlet Oxygen Quantum Yield Determination Using Chemical Acceptors.

Roger Bresolí-Obach^1,2, Joaquim Torra^1,3, Renzo P Zanocco⁴

¹Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona, Spain.

Methods in Molecular Biology (Clifton, N.J.)

|August 29, 2020

Summary

Quantifying singlet oxygen (¹O₂) production is crucial for understanding its biological roles. This study details a general procedure for accurately determining ¹O₂ quantum yield (Φ_Δ) using indirect methods, minimizing potential errors.

Keywords:

Photosensitizers Singlet oxygen Singlet oxygen chemical acceptors Singlet oxygen dosimetry Singlet oxygen indirect detection methods Singlet oxygen quantum yield

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Published on: December 27, 2018

Area of Science:

Photochemistry
Biophysics
Chemical Kinetics

Background:

Singlet oxygen (¹O₂) is a reactive oxygen species with dual roles in biological systems, acting in cell signaling at low concentrations and causing cytotoxicity at high concentrations.
Accurate quantification of ¹O₂ production is essential for understanding its biological impact and for developing therapeutic strategies.
Photosensitization is the primary method for generating ¹O₂, with the efficiency quantified by the ¹O₂ production quantum yield (Φ_Δ).

Purpose of the Study:

To provide a general step-by-step procedure for determining the ¹O₂ production quantum yield (Φ_Δ) using indirect methods.
To identify critical experimental conditions required for obtaining reliable Φ_Δ values.
To address common errors associated with indirect methods for ¹O₂ quantification.

Main Methods:

Review of common indirect methods for ¹O₂ detection, which involve trapping ¹O₂ with a suitable acceptor molecule.
Development of a general protocol for the determination of Φ_Δ values.
Identification and discussion of key experimental parameters influencing Φ_Δ measurements.

Main Results:

A standardized procedure for indirect determination of Φ_Δ is proposed.
Key experimental factors critical for accurate Φ_Δ measurements are identified.
Potential sources of error in indirect ¹O₂ quantification are highlighted.

Conclusions:

Indirect methods for determining ¹O₂ production quantum yield (Φ_Δ) are widely used but prone to errors.
A systematic approach and controlled experimental conditions are necessary for reliable Φ_Δ determination.
This work provides a framework for accurate quantification of singlet oxygen generation in various systems.