A novel fluorescent chemosensor for safranine T based on calixarene-1,3-diacyl hydrazone

A novel surfactant sensitized fluorescent chemosensor for safranine T (ST) based on calixarene-1,3-diacyl hydrazone (CADH) in sodium dodecyl sulfate (SDS) medium was investigated. The fluorescence intensity of CADH was quenched by ST due to the formation of weak fluorescent inclusion complex (ST-CADH), and the fluorescence quenching (ΔF = FCADH − FST-CADH) was sensitized in SDS. Under the optimal conditions, the linear range of calibration curve for the determination of ST was 0.02-3.00 μg/m and the detection limit estimated 0.015 μg/mL with RSD 2.2% (n = 3, c = 1.0 μg/mL). The mechanism of determination was discussed with the fluorescence quenching type, the inclusion of CADH with ST and surfactant sensitized effect. This method has been applied for the detection of ST in real samples with satisfactory results.