A new assay method for lipid peroxides using a methylene blue derivative.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biomedical Science

Background:

• Lipid hydroperoxides are critical biomarkers of oxidative stress.
• Accurate quantification of lipid hydroperoxides is essential for understanding cellular damage.

Purpose of the Study:

• To develop a simple, sensitive colorimetric method for determining absolute lipid hydroperoxide levels.
• To establish a reliable assay for biological materials.

Main Methods:

• A novel colorimetric reaction involving lipid hydroperoxides, a leucomethylene blue derivative, and hemoglobin.
• Measurement of absorbance at 666 nm to quantify methylene blue formation.
• Utilized cumene hydroperoxide as an external standard for absolute quantification.

Main Results:

• The developed method accurately determines lipid hydroperoxide concentrations.
• Sensitivity achieved for detecting levels below 7.5 nmol/tube.
• Demonstrated simplicity and sensitivity for biological sample analysis.

Conclusions:

• A new, straightforward, and sensitive colorimetric assay for lipid hydroperoxides has been established.
• This method provides a reliable tool for assessing oxidative stress in biological research.
• The assay is suitable for routine laboratory use in biomedical and biochemical studies.