Deep Eutectic Solvent-Mediated Synthesis of Bullet-Shaped Cerium Zinc Oxide and Sheet-Like Cerium Zinc Hydroxide Nitrate: Colorimetric and Fluorometric Detection of Pyrophosphate Ions

Abstract

This work demonstrates a simple and versatile deep eutectic solvent (DES)-assisted synthesis of bullet-shaped cerium−zinc oxide (Ce− ZnO) and sheet-like cerium−zinc hydroxide nitrate (Ce−Zn 5 (OH) 8 (NO 3 ) 2 • 2H 2 O). DES could serve not only as a green solvent but also as a superior template to produce these two different hierarchically shaped materials. Interestingly, Ce−ZnO shows catalytic activity toward polymerization of dopamine to initially pink color quinone derivatives with the visible light absorption at 475 nm and finally to blue-emitting polydopamine with highest fluorescence intensity at 480 nm. The catalytic activity of Ce−ZnO can be selectively inhibited by pyrophosphate ions (PPi), which leads to a decrease in the absorbance intensity or fluorescence emission. PPi detection strategies were established, and the linearity was achieved from 0.5 to 100 μM with a low detection limit of 0.05 μM for the fluorometric detection, while the linear detection was 0.5−150 μM and the low detection limit was 0.19 μM for colorimetric detection. This work offers a new opportunity to produce Ce−ZnO and Ce−Zn 5 (OH) 8 (NO 3 ) 2 •2H 2 O using an inexpensive and eco-friendly solvent, and provides a useful way of detecting PPi. Hence, from these findings, the proposed synthesis strategy is expected to serve as a novel green strategy for preparing hierarchically shaped materials.

Cyclometalated iridium(iii) complex of a 1,2,3-triazole-based ligand for highly selective sensing of pyrophosphate ion

“…3–6 Although various techniques have been evolved for the detection of pyrophosphate, in terms of sensitivity and cost, fluorescent chemosensors are highly attractive for pyrophosphate detection. 19–25 Also, fluorescence-based sensing is a rational choice, as it is rapid, easy to handle, and has facile applications such as the detection of analytes, cell imaging, disease diagnosis, etc . 4,26–30…”

Screening of acetylcholinesterase inhibitory and antioxidant active compounds from Terminalia chebula fruits by spectrum‐effect relationship and liquid chromatography‒mass spectrometry analysis

“…The longer the arrow is, the greater the contribution of a variable to PC. Therefore, 12 common peaks (1,2,3,4,5,6,8,9,11,12,14,15) were used for the subsequent correlation analysis between chemical components and efficacy.…”

“…Several methods have been used to screen active compounds, such as affinity ultrafiltration, biological sensors and nanoenzymes, electrochemical analysis, and immobilization of target molecules [6,8,[10][11][12][13][14]. However, there are some shortcomings, such as false-positive effects, preparation of carrier materials, and the need for expensive equipment, thus limiting their applications.…”

“…The 30% ethanol eluate fraction was further characterized by LC-MS analysis. The chromatographic peaks (Peaks 1,2,3,5,12,14,15) making great contributions to the efficacy were screened through a spectrum-effect relationship model, and sixteen components were further identified. The results suggested that the proposed strategy is simple and effective for acquiring active components from a complex matrix.…”

Extraction of curcumin from turmeric residue (Curcuma longa L.) using deep eutectic solvents and surfactant solvents

“…The studies focused on evaluating the extraction efficiency of compounds such as phenolics, flavonoids, terpenoids, and alkaloids. 11–13 DESs are safe, non-toxic, environmentally friendly, 14 and enable high extraction yields, so DESs are often called solvents of the 21st century, which could soon replace organic solvents. 8,12…”