title: A study of quenching and enhancing effects of some amino acids on peroxyoxalate chemiluminescence of rhodamine 6G.
abstract: The quenching effect of l-cysteine, l-methionine on strong chemiluminescence of bis(2,4,6-trichlorophenyl)oxalate-H(2)O(2) system in the presence of rhodamine 6G was studied. The chemiluminescence parameters were evaluated from computer fitting of the resulting intensity-time plots. These systems resulted in Stern-Volmer plots in the quencher concentration range of 4.0 x 10(-6) to 4.0 x 10(-5)M, with K(Q) values of 1.64 x 10(4) and 8.0 x 10(4)M(-1) for l-metionine and l-cysteine, respectively. Also, this study describes the employment of l-histidine as a highly potent signal enhancer in peroxyoxalate chemiluminescence in the presence of rhodamine 6G.
authors.affiliation: Department of Chemistry, Islamic Azad University, Savadkooh Branch & Young Researcher Club, Savadkooh, Iran. hossiny54@yahoo.com
authors.forename: Morteza
authors.initials: M
authors.lastname: Hosseini
authors.forename: Shiva Dehghan
authors.initials: SD
authors.lastname: Abkenar
authors.forename: Mohammad Javad
authors.initials: MJ
authors.lastname: Chaichi
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Ganjali
authors.forename: Parviz
authors.initials: P
authors.lastname: Norouzi
mesh_terms: D003545:Cysteine / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006639:Histidine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D016018:Least-Squares Analysis; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods; D008715:Methionine / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013997:Time Factors
chemical_list: D005456:Fluorescent Dyes; D010070:Oxalates; D012235:Rhodamines; C026188:rhodamine 6G; D006639:Histidine; C044622:peroxyoxalate; D008715:Methionine; D003545:Cysteine