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vol.47 número2COPOLYMERIZATION OF STYRENE BY DIPHENYLZINC-ADDITIVE SYSTEMS: PART III. COPOLYMERIZATION OF STYRENE/para- METHYLSTYRENE USING CpTiCl3-MAO and Ph2Zn-CpTiCl3-MAO INITIATOR SYSTEMSANTIFUNGAL AND ANTIBACTERIAL ACTIVITY OF DITERPENES ISOLATED FROM WOOD EXTRACTABLES OF CHILEAN PODOCARPACEAE índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

ABUIN, E.; LISSI, E.; ORTIZ, P.  e  HENRIQUEZ, C.. URIC ACID REACTION WITH DPPH RADICALS AT THE MICELLAR INTERFACE. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.2, pp.145-149. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000200010.

Uric acid, a water soluble antioxidant, is able to react with micelle incorporated diphenylpicrylhydracyl radicals. This indicates that uric acid can react at the lipid/water interface. The rate of the process follows the order cationic micelles >buffer/etanol > neutral micelles anionic micelles These results can be explained in terms of the compartmentalization of the reactants in different environments and the effect of electrostatic interactions in modulating the access of the urate anion to the micellar interface. Experiments aimed to determine if urate is able to react with a-tocopheroxyl radicals regenerating a-tocopherol were uncesessful, indicating that urate is not able to delay vitamin E consumption in the presence of lipid - soluble free radicals

Palavras-chave : DPPH; uric acid; micelles; sodium dodecylsulfate; Brij-35; dodecyltrimethylammonium bromide.

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