A handy and accessible tool for identification of Sn(II) in toothpaste

Abstract

An easily accessible colorimetric probe, a carbazole–naphthaldehyde conjugate (CNP), was successfully prepared for the selective and sensitive recognition of Sn(II) in different commercially-available toothpaste and mouth wash samples. The binding mechanism of CNP for Sn2+ was confirmed by UV–Vis, 1H, and 13C NMR titrations. The proposed sensing mechanism was supported by quantum chemical calculations. Selective detection of Sn(II) in the nanomolar range (85 nM), among other interfering metal ions, makes it exclusive. Moreover, Sn2+ can be detected with a simple paper strip from toothpaste, which makes this method handy and easily accessible. The potential application of this system for monitoring Sn2+ can be used as an expedient tool for environmental and industrial purposes.

Recent advances in tin ion detection using fluorometric and colorimetric chemosensors

“…The same research group very recently reported a carbazole-naphthaldehyde based probe ( 34 ) for colorimetric recognition of Sn 2+ ions in CH 3 CN : H 2 O (1 : 8, v/v) at pH 7.0 (10 mM phosphate buffer) solution. 111 In the presence of Sn 2+ , the initial absorption band at 400 nm decreased and a new absorption peak emerged at 454 nm with an isosbestic point at 425 nm. Probe 34 was able to detect Sn 2+ with a concomitant color change from pale yellow to deep orange.…”

Extractive spectrophotometric detection of Sn(II) using 6-bromo-3-hydroxy-2- (5-methylfuran-2-yl)-4H-chromen-4-one

“…The proposed method very e cient and sensitive in the selectivity of the tin(II) among various metal ions, synthetic samples containing tin up to 1.3 µg mL − 1 in the aliquot. The method is selective for tin(II) among synthetic samples of a large number of elements, especially magnesium,nickel, platinum, copper, uranium, tantalum,selenium,zinc, cerium, arsenic, ruthenium, osmium, tin, titanium, beryllium, rhenium, zirconium, iron, vanadium chromium,and molybdenum which seriously interfere in most of the existing methods of tin(II) determination (Table-1) [25]. The method has the advantages of higher sensitivity, selectivity, and a wider Beer's law range, as well as the ability to be applied to samples containing several interfering elements in concentrations higher than is usually the case, in addition to being simple, rapid, precise, and accurate.The process is simple and takes approximately 5 minutes each determinationand the complex is stable for 2 days[26].…”

Differential detection of aspartic acid in MCF-7 breast cancer cells

“…Due to their simplicity, high selectivity, sensitivity, low cost, easy implementation, and real-time detection, it is always preferable to use chemosensors as an expedient tool in biological and clinical examination. [22][23][24][25][26][27][28][29] Herein, we report a pyridine-carbazole framework (PCF) to detect aspartic acid in live cell systems. The PCF probe has been characterized using UV-visible, fluorescence, 1 H NMR, 13 C NMR, and high-resolution mass spectrometry spectra, for C 20 H 18 N 3 with calc.…”

“…Due to their simplicity, high selectivity, sensitivity, low cost, easy implementation, and real-time detection, it is always preferable to use chemosensors as an expedient tool in biological and clinical examination. 22–29…”