Singlet molecular oxygen [O2(1Deltag)]-mediated photodegradation of tyrosine derivatives in the presence of cationic and neutral micellar systems.
Amino Acids
; 35(1): 201-8, 2008 Jun.
Article
em En
| MEDLINE
| ID: mdl-17619119
The kinetics of rose bengal-sensitized photooxidation of tyrosine and several tyrosine-derivatives (tyr-D) named tyrosine methyl ester, tyrosine ethyl ester and tyrosine benzyl ester was studied in buffered pH 11 water, and buffered pH 11 micellar aqueous solutions of 0.01 M cetyltrimethylammonium chloride (CTAC) and 0.01 M-octylphenoxypolyethoxyethanol [triton X100 (TX100)]. Through time-resolved phosphorescence detection of singlet molecular oxygen (O(2)((1)Delta(g))) and polarographic determination of oxygen consumption, the respective bimolecular rate constants for reactive (k(r)) and overall (k(t)) quenching of the oxidative species by tyr-D were evaluated. Both rate constants behave in different fashion depending on the particular reaction medium. k(r)/k(t) values, increase in the sense CTAC<
Assuntos
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Octoxinol
/
Oxigênio Singlete
/
Compostos de Bis-Trimetilamônio
/
Micelas
Idioma:
En
Revista:
Amino Acids
Assunto da revista:
BIOQUIMICA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Áustria
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Octoxinol
/
Oxigênio Singlete
/
Compostos de Bis-Trimetilamônio
/
Micelas
Idioma:
En
Revista:
Amino Acids
Assunto da revista:
BIOQUIMICA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Áustria