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A tandem mass spectrometric method for singlet oxygen measurement
Maarit Karonen1, Heta Mattila, Ping Huang
1Laboratory of Organic Chemistry and Chemical Biology, Department of Chemistry, University of Turku, Turku, Finland.
Photochemistry and Photobiology
|May 23, 2014
Summary
Researchers developed a new method to measure singlet oxygen, a harmful molecule, using ultra-high-performance liquid chromatography and tandem mass spectrometry. This technique quantifies singlet oxygen production in plant membranes.
Area of Science:
- Analytical Chemistry
- Plant Physiology
- Biochemistry
Background:
- Singlet oxygen is a harmful reactive oxygen species.
- Quantification of singlet oxygen is crucial for understanding oxidative stress.
- 2,2,6,6-tetramethylpiperidine (TEMP) reacts with singlet oxygen to form TEMPO, a stable nitroxyl radical.
Purpose of the Study:
- To develop an ultra-high-performance liquid chromatographic-tandem mass spectrometric (UHPLC-ESI-MS/MS) method for quantifying TEMPO.
- To validate the UHPLC-ESI-MS/MS method for measuring singlet oxygen in biological and nonbiological samples.
- To compare singlet oxygen production in plant thylakoid membranes using the new method and electron paramagnetic resonance (EPR) spectroscopy.
Main Methods:
- Design and implementation of a UHPLC-ESI-MS/MS method utilizing multiple reaction monitoring (MRM) for TEMPO quantification.
- Application of the UHPLC-ESI-MS/MS method to measure singlet oxygen levels.
- Comparison of results with traditional electron paramagnetic resonance (EPR) spectroscopy.
Main Results:
- A sensitive and specific UHPLC-ESI-MS/MS method for TEMPO quantification was successfully developed.
- The method demonstrated utility for singlet oxygen measurements in diverse sample types.
- Plant thylakoid membranes were found to produce 3.7 × 10⁻⁷ molecules of singlet oxygen per chlorophyll molecule per second under illumination (2000 μmol m⁻² s⁻¹).
Conclusions:
- The developed UHPLC-ESI-MS/MS method provides a robust alternative for singlet oxygen quantification.
- This method enables accurate measurements of singlet oxygen in complex biological systems.
- The study quantifies light-induced singlet oxygen production in plant thylakoid membranes.
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