Chemiluminescence of curcumin and quenching effect of dimethyl sulfoxide on its peroxyoxalate system

The chemiluminescence behavior of the reaction between bis(2,4,6-trichlorophenyl)oxalate (TCPO) and hydrogen peroxide, in the presence of curcumin as fluorophore, has been investigated. Experimental factors such as TCPO, sodium salicylate (SS), hydrogen peroxide and curcumin concentration were optimized. The chemiluminescence signal showed a linear decay while dimethyl sulfoxide (DMSO) was added to the peroxyoxalate (PO-CL) system. The reaction resulted in a Stern–Volmer plot with a Kq value of 7.3×104. The evaluated lower and upper detection limits of measurable concentrations of DMSO are 3.50×10−5 and 1.53×10−4 M, respectively. The PO-CL parameters were estimated by computer fitting of the experimental CL intensity to proper models.