ABSTRACT
The antioxidant effect of 5-Aminosalicylic acid (5-ASA) on copper-mediated LDL oxidation was followed either by the emitted chemiluminiscence (CL) or by UV-vis spectroscopy. 5-ASA addition extends the lag phase in a concentration-dependent manner without changes in the rate of the process in the autoaccelerated phase. The antioxidant behavior of 5-ASA was very similar to that of Trolox, a very efficient water soluble antioxidant. The copper-binding capacity of 5-ASA was evaluated by UV-visible spectroscopy. The addition of copper to a 5-ASA solution increases the absorbance at 332 nm and generates a new band at 298 nm. These changes in the UV-vis spectra indicate formation of a complex between 5-ASA and copper. However, LDL protection by 5-ASA is unrelated to its copper chelating capacity.
Subject(s)
Aminosalicylic Acids/pharmacology , Antioxidants/pharmacology , Copper/chemistry , Lipoproteins, LDL/metabolism , Aminosalicylic Acids/chemistry , Aminosalicylic Acids/metabolism , Antioxidants/chemistry , Antioxidants/metabolism , Copper/toxicity , Luminescent Measurements , Oxidation-Reduction/drug effects , Spectrophotometry, Ultraviolet , Time FactorsABSTRACT
Estudou-se uma preparaçäo oral de ácido 5-aminossalicílico de liberaçäo pH dependente. Participaram do estudo 11 indivíduos com idades variando entre 20 e 63 anos, dos quais três eram voluntários sadios, seis apresentavam retocolite ulcerativa e dois doença de Crohn. Através de um acompanhamento radiológico efetuado na 6ª, 12ª e 24ª hora, constatou-se que a desintegraçäo dos comprimidos se realiza somente na regiäo ileocecal e cólon. Finalmente, com base nos resultados, destaca-se a potencialidade da formulaçäo no controle das doenças inflamatórias intestinais