n-[4-(dimethyl amino) benzylidene] benzoxide as a new luminophor in peroxyoxalate chemiluminescence system for the determination of sucrose

In this work, the first, intense and efficient pocl arising from the reaction of bis (2, 4, 6-trichlrophenyl) oxalate (tcpo) with hydrogen peroxide in the presence of n-[4-(dimethyl amino) benzylidene] benzoxide (nitrone) as a new luminophor has been reported. the relationships between the chemiluminescence intensity and concentrations of all reagents were investigated. the quenching effect of some cations and compounds such as fe3+, co2+, cu2+, mn2+, ni2+, cd2+ ions and imidazole, l-histidine, l-tyrosine, d-(+)-lactose, and d-(+)-sucrose, on the pocl system were investigated. the kq values were calculated from stern–volmer equation. it was found that the kq values decreases in the order: co2+ > fe3+ > cu2+ > mn2+ > ni2+ > cd2+ and d-(+)-lactose > imidazole > l-tyrosine > l-histidine > d-(+)-sucrose. dynamic range and detection limit of all quencher were determined. sucrose has the best dynamic range and low detection limit, so sucrose considered as an analyte and then the total sucrose extracted from sugar beet as real sample was measured by this proposed method. dynamic range, detection limit, mean intra-day and inter-day relative standard deviation (rsd%) were 6.67×10-7- 1.20×10-5, 1.0×10-8, 5.62%, 7.25% (n=3) respectively. for accuracy determination, the percentage recovery was found 97.4%- 104.3%. all interferences were investigated and co2+, d-(+)-lactose had most interference. sucrose percentage of the measured sample was 17 percent. these results are comparable with the results of the standard method to determine the sucrose and is acceptable.