A study of quenching effect of sulfur-containing amino acids L-cysteine and L-methionine on peroxyoxalate chemiluminescence of 7-amino-4-trifluoromethylcumarin.
The quenching effect of L-cysteine and L-methionine on strong chemiluminescence of bis-(2,4,6-trichlorophenyl)oxalate-H(2)O(2) system in the presence of 7-amino-4-trifluoromethylcumarin was studied. The chemiluminescence parameters were evaluated from computer fitting of the resulting intensity-time plots. Both systems resulted in Stern-Volmer plots in the quencher concentration range of 6.5 x 10(-5) to 5.2 x 10(-4)M with k(Q) values of 1.15 x 10(4) and 1.28 x 10(4)M(-1) for L-cysteine and L-methionine, respectively.
Shamsipur
Mojtaba
M
Department of Chemistry, Razi University, Kermanshah, Iran. mshamsipur@yahoo.com
Chaichi
Mohammad Javad
MJ
D003374:Coumarins / Q000737:chemistry*; D003545:Cysteine / Q000737:chemistry*; D007700:Kinetics; D008163:Luminescent Measurements; D008715:Methionine / Q000737:chemistry*; D008956:Models, Chemical; D010070:Oxalates / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013455:Sulfur / Q000737:chemistry*
D003374:Coumarins; D010070:Oxalates; C055467:7-amino-4-trifluoromethylcoumarin; C044622:peroxyoxalate; D013455:Sulfur; D008715:Methionine; D003545:Cysteine