Tracking the concentration of Al³⁺ in the aqueous system up to the nanomolar range using a modified biopolymer chitosan based fluorophore

Abstract

The paper reports the development of biopolymer chitosan based fluorophore for selective detection of Al3+ in aqueous streams. Fluorescence sensing based on the change in the photophysical properties of the...

Development of an azo functionalized oligomeric chitosan sensor for rapid visual, spectrophotometric and spectrofluorometric detection of KMnO4 up to micromolar concentrations

“…An azo-functionalized oligomeric chitosan reagent (β-NAC) was successfully synthesized via the ultrasonication technique, and its proposed mechanism is discussed in ref. 23.…”

“…In order to record the fluorescence emission spectrum, the excitation wavelength was fixed at 327 nm and the emission maximum was obtained at 427 nm. 23 Reagents and solutions A β-NAC reagent was prepared by dissolving 40 mg of the deep reddish-brown-coloured product in 100 mL of water for all three detection methods. A stock solution of KMnO 4 of 0.1 M was prepared in water and further diluted to different required concentrations by adding water.…”

“…In order to record the fluorescence emission spectrum, the excitation wavelength was fixed at 327 nm and the emission maximum was obtained at 427 nm. 23…”

“…The synthesized β-NAC sensor was characterized by FT-IR, 1 H-NMR, SEM-EDX, PXRD, and MALDI-TOF analyses reported in ref. 23. The thermal behaviours of the β-NAC sensor were explored by TGA-DTA-DTG analysis using a PerkinElmer STA6000 machine.…”

Discriminative ‘Turn-on’ Detection of Al3+ and Ga3+ Ions as Well as Aspartic Acid by Two Fluorescent Chemosensors

“…The high concentration of aluminum in humans can cause severe neurodegenerative diseases such as Alzheimer’s, amyotrophic lateral sclerosis, and Parkinson’s diseases along with various other diseases including microcytic hypochromic anemia, dialysis encephalopathy, and Al-related bone disease [ 1 , 13 , 14 , 15 ]. As per the World Health Organization (WHO), the permissible limit of aluminum ions in drinking water is 7.4 μM while the daily average intake should not exceed 3–10 mg [ 15 , 16 , 17 ]. Therefore, efforts have been made to develop efficient sensors that can detect aluminum ion (Al 3+ ) selectively and sensitively [ 10 ].…”