A highly selective and sensitive spectrophotometric method for the determination of selenium using 2-hydroxy-1-napthaldehyde-orthoaminophenol

A novel thiazole phenol conjugate, 2-aminothiazolesalicylaldehyde (receptor1) was designed and synthesized for the first time through a single step process via Schiff base condensation reaction. The formation of receptor1 was confirmed by FTIR, 13 C NMR, and 1 H NMR. The IR spectra confirmed the presence of the aldimine formation. It is further supported by the proton NMR, showing the disappearance of aldehyde peaks and the formation of a new imine peak. This is further corroborated by the 13 C NMR. The receptor1 complexing with various metal ions were studied through fluorescence spectroscopy showed its selectivity toward Fe 2+ ion following a reverse photoinduced electron transfer (PET) process compared to all other potentially competing ions. The receptor1 was applied as a sensor to sense Fe 2+ ion in water samples. The detection limit for Fe 2+ ion in drinking water was substantially lower (0.003 µM) than the EPA (environmental protection agency) recommendation (5.37 M). The capability of receptor1 in recovering Fe 2+ ion in bore water, tap water, and drinking water was up to 99.5%. The receptor1 was also used as a chelating ligand (receptor1) in molecular docking and it was assessed as a potential inhibitor of NUDT5, a silence hormone signaling for breast cancer. The test compound (PDB: 5NWH) showed good affinity toward the target receptor1 with the binding energy of – 5.23 kcal mol −1 . Furthermore, the receptor1 showed excellent reversibility property on adding EDTA solution. Due to the marvelous reversible property, a molecular-scale sequential information processing circuit is designed for the multi-task behavior such as ‘Writing-Reading-Erasing-Reading’ in the form of binary logic gate. The consecutive addition of Fe 2+ ion and EDTA solution to receptor1 paves a way for the construction of INHIBIT logic gate. Additionally, the receptor1 showed the mimicking behavior of molecular keypad lock. Supplementary Information The online version contains supplementary material available at 10.1007/s11696-022-02373-z.

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“…The peak at 1658.78 cm -1 con rms the presence of C=N stretching band (Fig. S1) [31]. The total number of carbon was con rmed by 13…”

Section: Resultsmentioning

confidence: 83%

An efficient 2-aminothiazolesalicylaldehyde fluorescent chemosensor for Fe2+ ion detection and a potential inhibitor of NUDT5 signaling hormone for breast cancer cell and molecular keypad lock application

Basha¹,

David

Nandhakumar

et al. 2022

Chem. Pap.

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“…The detection limits of calcium, magnesium, silicon, sodium, iron, and selenium were 50 µg Ca/L, 10 µg Mg/L, 2 mg Si/L, 20 µg Na/L, 50 µg Fe/L, and 1 µg Se/L, respectively. In order to cross check the Se(IV) concentrations, the determination was also conducted by following the Ahmed et al (2015) spectrophotometric analytical method (detection limit 1 µg/L) [36], using the spectrometer UV-VIS HITACHI U-5100. Nitrate, chloride, and sulfate were measured with the Alltech 600 ion chromatography system, using an Allsep anion, 150 mm × 4.6 mm, 7 µm, PEEK 51209 column and applying a 1.7 mM NaHCO 3 /1.8 mM Na 2 CO 3 (supplied by Merck, >99.5% purity) solution as eluent.…”

Section: Methodsmentioning

confidence: 99%

Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels

et al. 2021

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The research on selenium presence in water resources has revealed the need to determine the respective aquatic species. As selenium oxyanions SeO32− (SeIV) and SeO42− (SeVI) predominate in natural waters, their determination is essential, mainly due to different ecotoxicity properties, as well as to different removal options from relevant-polluted waters. This study focuses on the SeO32−/SeO42− speciation/separation and determination through the selective adsorption of SeO32− only onto specific iron oxy-hydroxides (FeOOHs). For this purpose, the laboratory prepared FeOOHs examined along with the commercially available relevant material (Bayoxide), which was found to present optimum results for the speciation of selenium oxyanions, at the low concentration range 10–100 μg/L, using a dose of 0.5 g/L of adsorbent and gently stirring for 30 min at the usually encountered pH value of 7.3 ± 0.2. Moreover, the relevant experiments showed that the other major ions Cl−, HCO3−, NO3−, SO42−, Ca2+, Mg2+, Na+, possibly found in most natural waters at the concentration range 0–200 mg/L, as well as silicon, total organic carbon (TOC) of natural organic matter (NOM) and iron at the concentration range 0–50 mg/L, 0–5 mg/L and 0–1 mg/L, respectively, did not interfere with the selective adsorption of Se(IV). Furthermore, the most important advantage of this selective speciation method is its implementation/combination with all commonly applied analytical methods for the determination of total selenium.

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“…There are many analytical techniques with their self-advantages and disadvantages, such as capillary electrophoresis online coupled with hydride generation-atomic fluorescence spectrometry (CE/HG AFS) 2 , inductively coupled plasma mass spectrometry (ICP MS) after a separation and preconcentration procedure 4,7 , spectrophotometry with and without preconcentration 8,9 , graphite furnace atomic absorption spectrometric (GF AAS) after preconcentration with coprecipitation 10 , electrothermal atomic absorption spectrometry (ET AAS) 11 , inductively coupled plasma optical emission spectrometry with hydride generation (HG ICP OES) 12 , atomic absorption spectrometry with hydride generation (HG AAS) 13 , and high performance liquid chromatography with UV detection (HPLC) [14][15][16][17] in literature for speciation analysis of inorganic selenium species.…”

Section: Introductionmentioning

confidence: 99%

Determination of trace amounts of selenium in natural spring waters and tea samples by catalytic kinetic spectrophotometry

Gürkan

2019

Eclet. Quim. J.

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In this work, a new kinetic method is described for the determination of trace Se(IV) in natural spring waters and commercial tea samples. The method is based on the activation of Se(IV) onto the indicator reaction in acidic medium. The reaction was monitored using a fixed time approach of 20 min at 680 nm. The variables affecting the reaction rate were evaluated and optimized. The method allows the determination of Se(IV) in the range of 0.0125-1.0 mg L-1 with a detection limit of 3.6 µg L-1. The precision was in range of 0.63-3.15% (as RSD %) with a higher recovery than 98.6%. The method has been found to be selective against matrix effect. The method was applied to the speciation analysis of inorganic Se species present in the selected samples. The method was statistically validated by analysis of two certified samples and comparing the obtained results to those of HG-AAS analysis. Also, the total Se levels of the samples were determined by using both methods after conversion of Se(VI) into Se(IV) in ultrasonic bath in acidic medium for 30 min at 85-90 °C. The results were in good agreement with those of HG-AAS. The Se(VI) level of the samples was calculated from the difference between amounts of total Se and Se(IV).

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A highly selective and sensitive spectrophotometric method for the determination of selenium using 2-hydroxy-1-napthaldehyde-orthoaminophenol

Cited by 8 publications

References 34 publications

An efficient 2-aminothiazolesalicylaldehyde fluorescent chemosensor for Fe2+ ion detection and a potential inhibitor of NUDT5 signaling hormone for breast cancer cell and molecular keypad lock application

An efficient 2-aminothiazolesalicylaldehyde fluorescent chemosensor for Fe2+ ion detection and a potential inhibitor of NUDT5 signaling hormone for breast cancer cell and molecular keypad lock application

Speciation and Determination of Selenium Oxyanions at the Drinking Water Pollution Concentration Levels

Determination of trace amounts of selenium in natural spring waters and tea samples by catalytic kinetic spectrophotometry

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