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The photo-physical and photo-chemical properties of melatonin (ML) were studied by 266 nm laser flash photolysis (LFP). ML undergoes photo-ionization to produce radical cation of ML (ML·+) and hydrated electrons (e a-q ), while excited triplet state 3ML* is also formed during photolysis. The oxidation via one electron transfer from ML to SO4·- and the triplet state of riboflavin (3RF*) has been also investigated and the rate constants for the process have been determined to be 8.0×109 and 1.4×109 L·mol-1·s-1 respectively. The radical cation of 2,2’-azinobis(3-ethylbenzothiazoline-6- sulfonic acid)(ABTS·+) scavenging capacities of melatonin and other antioxidants are compared in this paper.
The photo-physical and photo-chemical properties of melatonin (ML) were studied by 266 nm laser flash photolysis (LFP). ML undergoes photo-ionization to produce radical cation of ML (ML · +) and hydrated electrons The oxidation via one electron transfer from ML to SO4 · - and the triplet state of riboflavin (3RF *) has been also investigated for the rate constants for the process have been determined to be 8.0 × 109 and 1.4 × 109 L · mol -1 · s-1 respectively. The radical cation of 2,2’-azinobis (ABTS · +) scavenging capacities of melatonin and other antioxidants are compared in this paper.