Abstract: In vitro antioxidant activity for 12 stannoxanes derived from Ph3SnCl (compounds 1-3), Ph2SnCl2 (compounds 4-6), Bu3SnCl (compounds 7-9), and Bu2SnCl2 (compounds 10-12), was assayed qualitatively by the chromatographic profile with 1,1-diphenyl-2-picrylhydrazil (DPPH) method and by two quantitative methods: the DPPH radical scavenging activity and Ferric-Reducing Antioxidant Power (FRAP) assays. The results were compared with those obtained with the starting materials 2-pyridine- carboxylic acid (I), 3-pyridinecarboxylic acid (II) and 4-pyridinecarboxylic acid (III), as well as with standard compounds, such as vitamin C and vitamin E, respectively. The in vitro antiradical activity with DPPH of diphenyltin derivative 5 showed a very similar behavior to vitamin C at a 20 µg/mL concentration, whereas according to the FRAP method, compound 8 was better. This difference is due to the mechanism of the antioxidant process. The Structure-Activity Relationships (SAR) for both methods is also reported.
Keywords: antioxidant activity; pyridinecarboxylate; organotin; DPPH; ferric-reducing
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Corona-Bustamante, A.; Viveros-Paredes, J.M.; Flores-Parra, A.; Peraza-Campos, A.L.; Martínez-Martínez, F.J.; Sumaya-Martínez, M.T.; Ramos-Organillo, Á. Antioxidant Activity of Butyl- and Phenylstannoxanes Derivedfrom 2-, 3- and 4-Pyridinecarboxylic Acids. Molecules 2010, 15, 5445-5459.
Corona-Bustamante A, Viveros-Paredes JM, Flores-Parra A, Peraza-Campos AL, Martínez-Martínez FJ, Sumaya-Martínez MT, Ramos-Organillo Á. Antioxidant Activity of Butyl- and Phenylstannoxanes Derivedfrom 2-, 3- and 4-Pyridinecarboxylic Acids. Molecules. 2010; 15(8):5445-5459.
Corona-Bustamante, Alicia; Viveros-Paredes, Juan Manuel; Flores-Parra, Angelina; Peraza-Campos, Ana Lilia; Martínez-Martínez, Francisco J.; Sumaya-Martínez, María Teresa; Ramos-Organillo, Ángel. 2010. "Antioxidant Activity of Butyl- and Phenylstannoxanes Derivedfrom 2-, 3- and 4-Pyridinecarboxylic Acids." Molecules 15, no. 8: 5445-5459.