Chemistry of lipid peroxidation

Area of Science:

• Biochemistry
• Organic Chemistry

Background:

• Lipid peroxidation involves complex free radical chemistry.
• The classical autoxidation mechanism requires modification.

Purpose of the Study:

• To elucidate the complex free radical chemistry of lipid peroxidation.
• To incorporate novel reaction pathways into the understanding of autoxidation.

Main Methods:

• Modification of the classical autoxidation mechanism.
• Inclusion of peroxy radical beta fragmentation.
• Inclusion of peroxy radical cyclization.

Main Results:

• Formation of diene hydroperoxides, cyclic peroxides, bicyclic peroxides, and epoxy alcohols.
• Product distribution is influenced by hydrogen atom donors.
• A general scheme for autoxidation explains product distribution.

Conclusions:

• The free radical chemistry of lipid peroxidation is more complex than previously understood.
• Beta fragmentation and cyclization are key pathways in lipid autoxidation.
• The proposed scheme provides a comprehensive framework for understanding lipid peroxidation products.