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Lipid peroxidation, or lipid oxidation, is a complex chemical process that leads to oxidative degradation of lipids, [1] resulting in the formation of peroxide and hydroperoxide derivatives. [2] It occurs when free radicals , specifically reactive oxygen species (ROS), interact with lipids within cell membranes , typically polyunsaturated fatty ...
Deuterium-reinforced lipids can be used for protecting living cells by slowing the chain reaction of lipid peroxidation. [1] The lipid bilayer of the cell and organelle membranes contain polyunsaturated fatty acids (PUFA) are key components of cell and organelle membranes. Any process that either increases oxidation of PUFAs or hinders their ...
It has been claimed [by whom?] that the α-tocopherol form is the most important lipid-soluble antioxidant, and that it protects membranes from oxidation by reacting with lipid radicals produced in the lipid peroxidation chain reaction. [82] [85] This removes the free radical intermediates and prevents the propagation reaction from continuing.
4-Hydroxynonenal, or 4-hydroxy-2E-nonenal or 4-hydroxy-2-nonenal or 4-HNE or HNE, (C 9 H 16 O 2), is an α,β-unsaturated hydroxyalkenal that is produced by lipid peroxidation in cells. 4-HNE is the primary α,β-unsaturated hydroxyalkenal formed in this process. It is a colorless oil.
The free radical chain reaction is sometimes referred to as the Bolland-Gee mechanism [6] [7] or the basic autoxidation scheme (BAS) [8] and was originally based on the oxidation of rubbers, [9] but remains generally accurate for many materials.
Assay of TBARS measures malondialdehyde (MDA) present in the sample, as well as malondialdehyde generated from lipid hydroperoxides by the hydrolytic conditions of the reaction. [4] MDA is one of several low-molecular-weight end products formed via the decomposition of certain primary and secondary lipid peroxidation products.
Oxidative stress mechanisms in tissue injury. Free radical toxicity induced by xenobiotics and the subsequent detoxification by cellular enzymes (termination).. Oxidative stress reflects an imbalance between the systemic manifestation of reactive oxygen species and a biological system's ability to readily detoxify the reactive intermediates or to repair the resulting damage. [1]
Alpha-tocopherol is a fat-soluble antioxidant functioning within the glutathione peroxidase pathway, [15] and protecting cell membranes from oxidation by reacting with lipid radicals produced in the lipid peroxidation chain reaction. [3] [16] This removes the free radical intermediates and prevents the oxidation reaction from continuing.