INVESTIGADORES
MASSAD Walter Alfredo
artículos
Título:
Kinetic study on the photostability of riboflavin in the presence of barbituric acid
Autor/es:
MARÍA ISELA GUTIÉRREZ; SILVIA M. FERNÁNDEZ; WALTER A. MASSAD; NORMAN ANDINO GARCÍA
Revista:
REDOX REPORT
Referencias:
Año: 2006 vol. 11 p. 153 - 158
ISSN:
1351-0002
Resumen:
The photochemical fate of
riboflavin (vitamin B2) in the presence of barbituric acid was examined employing
polarographic detection of dissolved oxygen and steady-state and time-resolved spectroscopy.
Under visible light, riboflavin reacts with barbituric acid the latter being
transparent to this type of photo-irradiation via radicals and reactive
oxygen species, such as singlet molecular oxygen [O2(1Dg)] and
superoxide radical anion, which are generated from the excited triplet state of
the vitamin. As a result, both the vitamin and barbituric acid are
photodegraded. Kinetic and mechanistic studies on the photoreactions of
riboflavin in the presence of barbituric acid indicate the excellent quenching
ability of the latter towards O2(1Dg).