Triazole-based highly selective supramolecular sensor for the detection of diclofenac in real samples

• A simple method for selective detection of diclofenac in water and blood was developed
• Triazole based supramolecule was synthesized through multi-step organic synthesis
• Triazole based supramolecule exhibited enhancement in the absorbance intensity after interaction with diclofenac.
• The assay was used for determination of diclofenac in tape water of Karachi and in human blood plasma.

A triazole-based supramolecular chemosensor 6 for the selective spectrophotometric detection of diclofenac in human plasma and tap water was developed. The 6 was synthesized through click approach and characterized via UV–vis spectroscopy, FT-IR, Mass and NMR spectroscopy. The supramolecular interaction of compound 6 with commonly used drugs has been investigated with the help of UV–vis spectral titrations, FT-IR and 1H, 13C NMR spectroscopy. The UV–visible spectral changes upon addition of various commonly used drugs showed that compound 6 is highly selective for diclofenac over other drugs. The supramolecule 6 exhibited a selective enhancement in the absorbance intensity after mixing with diclofenac in human plasma and water samples in the presence of other drugs at pH 6–7, with a linear range of 0.938 (R2=0.938) and a limit of detection 10 µM. The relative standard deviation (RSD) for 100 µM diclofenac was found to be 0.462. The Job's plot analysis revealed that diclofenac bind to compound 6 in 1:1 stoichiometry.

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