scholarly journals Detection of Anti-viral Drug Riamilovir and Herbicides in Aqueous Media by Using Pyrene-based Fluorescent Chemosensors

2021 ◽  
Vol 8 (2) ◽  
pp. 20218208
Author(s):  
I. S. Kovalev ◽  
L. K. Sadieva ◽  
O. S. Taniya ◽  
D. S. Kopchuk ◽  
G. V. Zyryanov ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Fluorescence Quenching ◽  
Aqueous Media ◽  
Antiviral Drug ◽  
Fluorescent Chemosensors ◽  
Limits Of Detection ◽  
Ortho Cresol

Two ethyleneglycol esters of 1-pyrene carboxylic acid were studied as chemosensors for the fluorescence “turn-off” detection of two nitro-containing analytes, such as antiviral drug Riamilovir (Triazavirin ®) and herbicidal agent dinitro-ortho-cresol (DNOC). In both cases the dramatic fluorescence quenching was observed with quenching constants as high as 3·104 M-1 and limits of detection (LOD) as low as 100 ppb.

Hybrid nanoparticle based fluorescence switch for recognition of ketoprofen in aqueous media

2020 ◽  
Vol 5 (8) ◽  
pp. 1428-1436
Author(s):  
Anu Saini ◽  
Manpreet Kaur ◽  
Mayank ◽  
Anil Kuwar ◽  
Navneet Kaur ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Fluorescent Chemosensors ◽  
Fluorescence Switch ◽  
Nanomolar Detection ◽  
Hybrid Nanoparticle

Hybrid nanoassembly, fluorescent chemosensors, selective response to ketoprofen, and nanomolar detection.

Discriminating Chemosensor for Detection of Fe3+ in Aqueous Media by Fluorescence Quenching Methodology

2018 ◽  
Vol 39 (5) ◽  
pp. 631-637 ◽  
Author(s):  
Balasaheb D. Vanjare ◽  
Prasad G. Mahajan ◽  
Seong-Karp Hong ◽  
Ki Hwan Lee
Keyword(s):  
Fluorescence Quenching ◽  
Aqueous Media

scholarly journals Red-Emitting Hybrid Based on Eu3+-dbm Complex Anchored on Silica Nanoparticles Surface by Carboxylic Acid for Biomarker Application

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5494
Author(s):  
João A. O. Santos ◽  
Alessandra M. G. Mutti ◽  
Airton G. Bispo-Jr ◽  
Ana M. Pires ◽  
Sergio A. M. Lima
Keyword(s):  
Carboxylic Acid ◽  
Aqueous Suspension ◽  
Aqueous Media ◽  
Particle Morphology ◽  
Hybrid Structure ◽  
Hierarchical Organization ◽  
Stable Suspension ◽  
Carboxylate Groups ◽  
Red Luminescence ◽  
Average Size

Luminescent organic-inorganic hybrids containing lanthanides (Ln3+) have been prominent for applications such as luminescent bio-probes in biological assays. In this sense, a luminescent hybrid based on dense silica (SiO2) nanospheres decorated with Eu3+ β–diketonate complexes using dibenzoylmethane (Hdbm) as a luminescent antenna was developed by using a hierarchical organization in four steps: (i) anchoring of 3-aminopropyltriethoxysilane (APTES) organosilane on the SiO2 surface, (ii) formation of a carboxylic acid ligand, (iii) coordination of Eu3+ to the carboxylate groups and (iv) coordination of dbm− to Eu3+. The hybrid structure was elucidated through the correlation of thermogravimetry, silicon nuclear magnetic resonance and photoluminescence. Results indicate that the carboxylic acid-Eu3+-dbm hybrid was formed on the surface of the particles with no detectable changes on their size or shape after all the four steps (average size of 32 ± 7 nm). A surface charge of −27.8 mV was achieved for the hybrid, assuring a stable suspension in aqueous media. The Eu3+ complex provides intense red luminescence, characteristic of Eu3+5D0→7FJ electronic transitions, with an intrinsic emission quantum yield of 38%, even in an aqueous suspension. Therefore, the correlation of luminescence, structure, particle morphology and fluorescence microscopy images make the hybrid promising for application in bioimaging.

Fluorescence quenching of a rhodamine derivative: Selectively sensing Cu2+ in acidic aqueous media

2012 ◽  
Vol 132 (8) ◽  
pp. 1987-1993 ◽  
Author(s):  
Jihua Ding ◽  
Lidi Yuan ◽  
Ling Gao ◽  
Jingwen Chen
Keyword(s):  
Fluorescence Quenching ◽  
Aqueous Media ◽  
Rhodamine Derivative

A highly selective fluorescent chemosensor based on naphthalimide and Schiff base units for Cu2+ detection in aqueous medium

2017 ◽  
Vol 72 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Yuling Xu ◽  
Stephen Opeyemi Aderinto ◽  
Huilu Wu ◽  
Hongping Peng ◽  
Han Zhang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescence Quenching ◽  
Aqueous Medium ◽  
High Selectivity ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Medium Ph ◽  
Absorption And Fluorescence Spectroscopy ◽  
High Fluorescence ◽  
Base Units

AbstractA new Schiff base, 4-allylamine-N-(N-5-methylsalicylidene)-1,8-naphthalimide (1), has been designed and synthesized by combining a 1,8-naphthalimide moiety as a fluorophore and a Schiff base as a recognition group. Its photophysical properties were investigated by absorption and fluorescence spectroscopy, and this sensor exhibits a high fluorescence quantum yield of 0.75–0.91 inorganic solvents of different polarity. It also shows high selectivity for Cu2+ over other ions with fluorescence quenching in aqueous medium (pH=7.2). The reason for this phenomenon (fluorescence quenching) is attributed to the formation of a 1:1 complex between 1 and Cu2+ according to the Job plot and fluorescence titration. The sensor can be applied to the quantification of Cu2+ in a linear fashion from 0.5 to 5 μM with a detection limit of 0.23 μM. Additionally, the association constant (Ka) between Cu2+ and 1 is 1.328×106 M−1 in aqueous media.

Silica cross-linked nanoparticles encapsulating a phenothiazine-derived Schiff base for selective detection of Fe(iii) in aqueous media

2014 ◽  
Vol 2 (37) ◽  
pp. 6306-6312 ◽  
Author(s):  
Fangyuan Gai ◽  
Xiang Li ◽  
Tianlei Zhou ◽  
Xiaogang Zhao ◽  
Dongdong Lu ◽  
...  
Keyword(s):  
Schiff Base ◽  
Fluorescence Quenching ◽  
Aqueous Media ◽  
Selective Detection ◽  
Selective Determination ◽  
Design And Synthesis ◽  
Micellar Nanoparticles

This work demonstrates the design and synthesis of an ET-based fluorescence quenching chemosensor using silica cross-linked micellar nanoparticles as scaffolds to encapsulate EDDP for highly selective determination of Fe3+ in aqueous media.

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