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Abstract: A double-template imprinted biomimetic dendritic nano-fibers based piezoelectric sensor was developed for the analysis of dichlorodiphenyltrichloroethane and hexachorobenzene prevalent together as organo-chlorinated pesticide residues in real samples, without any cross reactivity and false positives. For this, the immobilization of 2,5-thiophene dicarbonyl dichloride molecules was initially carried out on the surface of gold quartz crystal via Au-S links. Latter, these molecules were covalently attached to dendron molecules (monomer) followed by the free-radical polymerization at 65 °C, in the presence of both target analytes, cross-linker and initiator, leading to the development of self-assembled molecularly imprinted dendrimer nano-fibers on the gold surface. The method of analysis necessarily involved a typical 'saturation approach' in this work. Accordingly, one of the molecular cavities was completely saturated with an authentic amount of the respective analyte, whereas the cavity specific for other analyte was exposed to rebinding resulting in the frequency change in accordance with the mass of the analyte in question. Detection limits of dichlorodiphenyltrichloroethane and hexachorobenzene were realized as low as 0.75 and 0.69 ng mL-1 (S/N = 3), and linearity observed in the concentration ranges 5.0-150.0 and 5.0-75.0 ng mL-1, respectively
Template and target information: dual template, dichlorodiphenyltrichloroethane, hexachorobenzene, HCB, DDT
Author keywords: Molecularly imprinted dendrimer, quartz crystal microbalance, Dichlorodiphenyltrichloroethane, Hexacholrobenzene, Ultra trace analysis