Deciphering the fluorescence quenching mechanism of a flavonoid drug following interaction with human hemoglobin

2021 ◽  
Author(s):  
Riya Sett ◽  
Bijan K. Paul ◽  
Nikhil Guchhait
Keyword(s):  
Fluorescence Quenching ◽  
Human Hemoglobin ◽  
Quenching Mechanism ◽  
Fluorescence Quenching Mechanism

The π-conjugation length determines the fluorescence quenching mechanism of aromatic aldehydes in water

2018 ◽  
Vol 515 ◽  
pp. 710-718
Author(s):  
Katharyn Fletcher ◽  
Maximilian Krämer ◽  
Uwe H.F. Bunz ◽  
Andreas Dreuw
Keyword(s):  
Fluorescence Quenching ◽  
Aromatic Aldehydes ◽  
Conjugation Length ◽  
Quenching Mechanism ◽  
Fluorescence Quenching Mechanism

A Unified Fluorescence Quenching Mechanism of Tetrazine-Based Dyes: Energy Transfer to a Dark State

2021 ◽  
Author(s):  
Weijie Chi ◽  
Lu Huang ◽  
Chao Wang ◽  
Davin Tan ◽  
Zhaochao Xu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Quenching Mechanism ◽  
Dark State ◽  
Medical Diagnostic ◽  
Fluorogenic Probes ◽  
Fluorescence Quenching Mechanism ◽  
Diagnostic Applications

Tetrazine-based fluorogenic probes are powerful tools for bioimaging, biosensing, and medical diagnostic applications. In these probes, the attachment of a tetrazine moiety generates a non-fluorescent precursor; upon the bio-orthogonal reaction...

Resolving the Fluorescence Quenching Mechanism of an Oxazine Dye Using Ultrabroadband Two-Dimensional Electronic Spectroscopy

2019 ◽  
Vol 123 (24) ◽  
pp. 5072-5080 ◽  
Author(s):  
William P. Carbery ◽  
Brismar Pinto-Pacheco ◽  
Daniela Buccella ◽  
Daniel B. Turner
Keyword(s):  
Fluorescence Quenching ◽  
Electronic Spectroscopy ◽  
Two Dimensional ◽  
Quenching Mechanism ◽  
Fluorescence Quenching Mechanism

Cobalt oxyhydroxide nanoflake based fluorescence sensing platform for label-free detection of DNA

The Analyst ◽  
2016 ◽  
Vol 141 (15) ◽  
pp. 4719-4724 ◽  
Author(s):  
Yaqing Chang ◽  
Zhe Zhang ◽  
Huiqing Liu ◽  
Nan Wang ◽  
Jilin Tang
Keyword(s):  
Fluorescence Quenching ◽  
Label Free ◽  
Quenching Mechanism ◽  
Fluorescence Sensing ◽  
Single Stranded Dna ◽  
Cobalt Oxyhydroxide ◽  
Sensing Platform ◽  
Label Free Detection ◽  
Fluorescence Quenching Mechanism ◽  
Coooh Nanoflakes

In this study, we investigated the interaction of cobalt oxyhydroxide (CoOOH) nanoflakes with DNA and their fluorescence quenching mechanism of a FAM-labeled single-stranded DNA (ssDNA) probe.

pH-related fluorescence quenching mechanism of pterin derivatives and the effects of 6-site substituents

2018 ◽  
Vol 96 (4) ◽  
pp. 404-410
Author(s):  
Lei Liu ◽  
Bingqing Sun
Keyword(s):  
Density Functional Theory ◽  
Hydrogen Bonding ◽  
Fluorescence Quenching ◽  
Density Functional ◽  
Relaxation Processes ◽  
Quenching Mechanism ◽  
Functional Theory ◽  
Td Dft ◽  
Fluorescence Quenching Mechanism ◽  
Acidic Conditions

2-Amino-4-hydroxypteridine (pterin) and its derivatives serve as photooxidants and exhibit strong fluorescence. When they interact with hydrogen acceptors such as acetate and phosphate, their fluorescences are significantly quenched in acidic conditions (pH 4.9–5.5) but are retained in basic conditions (pH 10.0–10.5). This pH-related fluorescence quenching mechanism of pterin and its derivatives are fully investigated by using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). Pterin and its derivatives are demonstrated to show favorable excited-state proton transfer (ESPT) abilities in acidic conditions that induce the experimentally observed fluorescence quenching. In contrast, the ESPT processes are found to be retarded due to the lack of strong hydrogen-bonding interactions in basic environments, which sustain their fluorescence. Interestingly, these ESPT processes are found to show different site specificities depending on the 6-site substituents. The introduction of electron-donating substituent activates the N1 site, making it the preferred ESPT site. By contrast, the introduction of an electron-withdrawing substituent activates the N5 site, making it the favorable ESPT site. The substitutions of different functional groups are found to affect the locations of acidic centers during the excitation and relaxation processes. This further affects the hydrogen-bonding patterns and ultimately brings site specificity to the ESPT process.

Doping effect and fluorescence quenching mechanism of N-doped graphene quantum dots in the detection of dopamine

Talanta ◽  
2019 ◽  
Vol 196 ◽  
pp. 563-571 ◽  
Author(s):  
Y. Ma ◽  
A.Y. Chen ◽  
X.F. Xie ◽  
X.Y. Wang ◽  
D. Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Graphene Quantum Dots ◽  
Doping Effect ◽  
Quenching Mechanism ◽  
Doped Graphene ◽  
Fluorescence Quenching Mechanism
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