| In the absence of melanin, the ascorbic acid undergoes metal-catalyzed autoxidation. |
|
| In autoxidation the chain carriers are free radicals, electrically neutral molecular fragments containing unpaired electrons. |
|
| An example of autoxidation that is of great commercial concern is the one leading to the rancidity of fats, oils, and fatty foods. |
|
| Vitamin E is a chain-breaking antioxidant, i.e. it is able to repair oxidizing radicals directly, preventing the chain propagation step during lipid autoxidation. |
|
| Lipid oxidation is a major cause of meat quality deterioration, as products of autoxidation of unsaturated fatty acids affect wholesomeness and nutritional value. |
|
| It can also be formed by oxidative deoxyribose breakdown or autoxidation of sugars, such as glucose, and it plays a role in the pathophysiology of diabetes and ageing. |
|
| The products of autoxidation, called free radicals, are highly reactive, producing compounds that cause the off-flavours and off-odours characteristic of oxidative rancidity. |
|
| Hydroperoxide initiate autoxidation of lipid by attacking on the double bond in fatty acids and subsequently produce carbonyl compounds. |
|
| However through autoxidation and reaction with skin enzymes, the substance is activated and becomes the closely related allergen geranial. |
|
| A 1995 report showed that superoxide generated by autoxidation of pyrogallol was quenched by nicotinic acid only at supraphysiologic concentrations. |
|
| Autoxidation of the polyunsaturated fatty acids of flour lipids results in the formation of hydroperoxides, which are powerful oxidising agents. |
|
