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• W1969137717 endingPage "1100" @default.
• W1969137717 startingPage "1095" @default.
• W1969137717 abstract "Abstract The major objective was to measure the trolox (6‐hydroxy‐2,5,7,8‐tetramethylchroman‐2‐carboxylic acid) equivalent antioxidant capacity (TEAC) of carbazole derivatives (Ar 2 NHs) by means of scavenging 2,2′‐diphenyl‐1‐picrylhydrazyl (DPPH) and the 2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonate) radical cation (ABTS +· ). The Ar 2 NHs included phenoxazine (PozNH), phenothiazine (PtzNH), iminostilbene (IsbNH) and diphenylamine (DpaNH), and the TEAC of trolox, α‐tocopherol (TocH), l ‐ascorbic acid (VC) and l ‐ascorbyl‐6‐laurate (VC‐12) were measured as well. The TEAC results revealed that the ability to scavenge DPPH (PozNH > IsbNH ~PtzNH ~TroH ~TocH ~VC ~VC12), differed from the ability to scavenge ABTS + (PtzNH > IsbNH > PozNH > DpaNH ~TroH ~TocH ~VC ~VC12). CazNH did not react with DPPH and ABTS +· . Furthermore, the addition of acetic acid accelerated the reaction rate of Ar 2 NH to scavenge DPPH, suggesting that a sequential proton loss electron transfer (SPLET) mechanism occurred with amine‐type antioxidants during the trapping of DPPH. In contrast, the addition of acetic acid or pyridine reduced the reaction rate of Ar 2 NH to scavenge ABTS +. , suggesting that the hydrogen atom transfer (HAT) mechanism is the basis for the reaction that is occurring." @default.
• W1969137717 created "2016-06-24" @default.
• W1969137717 creator A5063399174 @default.
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• W1969137717 date "2007-10-30" @default.
• W1969137717 modified "2023-09-29" @default.
• W1969137717 title "Free-Radical-Scavenging Effect of Carbazole Derivatives on DPPH and ABTS Radicals" @default.
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• W1969137717 doi "https://doi.org/10.1007/s11746-007-1149-y" @default.
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