Antioxidants inhibit the formation and spread of free radicals which can be damaging in biological systems. Free radicals form in biological systems through metabolism, but it is also realized that exogenous environmental sources, such as radiation, food, and drugs, contribute significantly to the generation of free radicals in biological systems. Being reactive species, free radicals are short-lived and do not travel far from cellular targets. Their concentration in biological systems is very low and is difficult to detect directly by electron spin resonance spectroscopy (ESR). Indirect methods of reactions of radicals with specific biomolecules are also sufficiently sensitive to detect quantitatively their presence. Thus the response of antioxidant defenses which react with radical species, can serve as an indirect measure that free radicals have been formed. Redox-based antioxidants change their oxidation state and antioxidants become free radicals themselves. Often, however, the antioxidants give rise to more persistent free radicals, sometimes owing to delocalization of the lone electron around ring structures (in vitamin E, ubiquinones, and certain carotenes). Persistent free radicals react only rarely and the precursors often can be regenerated in biological systems. In recent years, it is becoming clearer from biochemical studies on how the major lipophilic antioxidants work. Particular attention has been given to vitamin E and quinones found in animal and plant membranes and in carotenoids, for the protection of membranes in lipoprotein systems. Flavonoids form another rich and varied source of natural antioxidants.
Produktkennzeichnungen
ISBN-10
3034874340
ISBN-13
9783034874342
eBay Product ID (ePID)
168406507
Produkt Hauptmerkmale
Sprache
Englisch
Anzahl der Seiten
656 Seiten
Verlag
Birkhäuser Basel, Springer Basel
Publikationsname
Lipid-Soluble Antioxidants: Biochemistry And Clinical Applications
Autor
Packer
Format
Taschenbuch
Erscheinungsjahr
2012
Zusätzliche Produkteigenschaften
Hörbuch
No
Inhaltsbeschreibung
Paperback
Item Length
24cm
Item Height
3cm
Item Width
17cm
Mitautor
Ong
Item Weight
1kg
Buchreihe
Molecular And Cell Biology Updates
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