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Sensitive quantitation of nitric oxide by EPR spectroscopy
K Tsuchiya1, M Takasugi, K Minakuchi
1Department of Pharmacy, Tokushima University Hospital, Japan.
Free Radical Biology & Medicine
|January 1, 1996
Summary
This study enhances nitric oxide (NO) detection using electron paramagnetic resonance (EPR) by improving the solubility and stability of the spin-trapping complex. The modified method achieves a detection limit of less than 10 pmol/ml for quantifying NO production.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biochemistry
Background:
- Electron paramagnetic resonance (EPR) with ferrous and mononitrosyl dithiocarbamate (Fe2+(DETC)2) is a method for nitric oxide (NO) detection.
- Previous methods faced limitations in biological systems due to low solubility and rapid oxidation of the NOFe2+(DETC)2 complex.
Purpose of the Study:
- To overcome the limitations of existing NO detection methods.
- To enhance the sensitivity and stability of the EPR spectrum for NO detection in biological systems.
Main Methods:
- Modified the EPR spin-trapping technique by adding albumin to improve Fe2+(DETC)2 solubility.
- Incorporated sodium dithionite (Na2S2O4) as a strong reductant to stabilize the NOFe2+(DETC)2 complex.
- Determined optimal reagent concentrations: 3.3 mM Fe2+ and DETC, 33 mg/ml albumin, and 2 M Na2S2O4.
Main Results:
- Achieved a detection limit of less than 10 pmol/ml for the NOFe2+(DETC)2 complex.
- Successfully quantified NO production from porcine aorta induced by forskolin using the modified method.
Conclusions:
- The modified EPR spin-trapping method significantly enhances NO detection sensitivity and stability in biological samples.
- This improved technique allows for accurate quantification of NO production in complex biological systems.