A Selective Spectrofluorometric Determination of Micromolar Level of Cyanide in Water Using Naphthoquinone Imidazole Boronic-Based Sensors and a Surfactant Cationic CTAB Micellar System |
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| Authors: | Matinee Jamkratoke Gamolwan Tumcharern Thawatchai Tuntulani Boosayarat Tomapatanaget |
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| Institution: | (1) Supramolecular Chemistry Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, 10330 Bangkok, Thailand;(2) National Nanotechnology Center, National Science and Technology Development Agency, Pathumthani, 12120, Thailand; |
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| Abstract: | We developed a new spectrofluorometric method for qualitative and quantitative determination of cyanide in water using the
incorporation of naphthoquinone imidazole boronic-based sensors (m
-NQB and p
-NQB) and a cationic surfactant, certyltrimethyl ammonium bromide (CTAB). This micellar system exhibited great selectivity for
cyanide detection with an assistance of the cationic surface of micelle. The interaction of boronic acid of the sensor toward
cyanide in CTAB micellar media gave a quantitative measure of cyanide concentration in the micromolar level. Under the optimal
condition, fluorescence intensity at 460 nm of m
-NQB and p
-NQB provided two sets of linear ranges, 0.5–15 μM and 20–40 μM and the limit of cyanide detection of 1.4 μM. Hence, both sensors in CTAB aqueous micellar system offered a considerably promising cyanide detection with 1000–fold enhancement
of the detection limit compared to those studied in DMSO: H2O. The proposed sensors could also be used to determine cyanide in water with good analytical characteristics. |
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