Abstract
The quenching effect of glutathione, l-cysteine, and l-methionine on the strong chemiluminescence (CL) intensity of bis(2,4,6-trichlorophenyl)oxalate (TCPO)–H2O2 in the presence of rubrene (5,6,11,12-tetraphenylnaphthacene) as a fluorescer was investigated. Kinetic parameters for the peroxyoxalate chemiluminescence (PO–CL) including the intensity at maximum CL, time at maximum intensity, total light yield, theoretical maximum level of intensity and pseudo-first order rate constants for the rise and fall of the CL burst (k r and k f ) were also calculated using the pooled intermediate model by a computerized non-linear least-squares curve fitting program (KINFIT). These systems resulted in Stern–Volmer plots in the quencher concentration range of 2.5 × 10−5 to 2.25 × 10−4 M, with k Q values of 2.5 × 104, 2.1 × 104 and 1.1 × 104 M−1, for glutathione, l-cysteine, and l-metionine, in order.
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