excited state quenching
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Author(s):  
Janneke Ravensbergen ◽  
Smitha Pillai ◽  
Dalvin D. Méndez-Hernández ◽  
Raoul N. Frese ◽  
Rienk van Grondelle ◽  
...  


2021 ◽  
Author(s):  
David Parker ◽  
Jack Fradgley ◽  
Jurriaan M Zwier ◽  
James William Walton ◽  
Martina Delbianco ◽  
...  

The relative sensitivity of structurally related Eu(III) complexes to quenching by electron and energy transfer processes has been compared. In two sets of 9-coordinate complexes based on 1,4,7-triazacyclonane, the Eu...



Author(s):  
Philipp Werther ◽  
Klaus Yserentant ◽  
Felix Braun ◽  
Kristin Grussmayer ◽  
Vytautas Navikas ◽  
...  

AbstractSmall-molecule fluorophores enable the observation of biomolecules in their native context with fluorescence microscopy. Specific labelling via bioorthogonal tetrazine chemistry confers minimal label size and rapid labelling kinetics. At the same time, fluorogenic tetrazine-dye conjugates exhibit efficient quenching of dyes prior to target binding. However, live-cell compatible long-wavelength fluorophores with strong fluorogenicity have been difficult to realize. Here, we report close proximity tetrazine-dye conjugates with minimal distance between tetrazine and fluorophore. Two synthetic routes give access to a series of cell permeable and impermeable dyes including highly fluorogenic far-red emitting derivatives with electron exchange as dominant excited state quenching mechanism. We demonstrate their potential for live-cell imaging in combination with unnatural amino acids, wash-free multi-colour and super-resolution STED and SOFI imaging. These dyes pave the way for advanced fluorescence imaging of biomolecules with minimal label size.



2020 ◽  
Vol 144 (2) ◽  
pp. 171-193 ◽  
Author(s):  
Evgeny E. Ostroumov ◽  
Jan P. Götze ◽  
Michael Reus ◽  
Petar H. Lambrev ◽  
Alfred R. Holzwarth


Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1038 ◽  
Author(s):  
Raphael C. Mordi ◽  
Olabisi T. Ademosun ◽  
Christiana O. Ajanaku ◽  
Ifedolapo O. Olanrewaju ◽  
John C. Walton

This article reviews the excited-state quenching, pro-vitamin A activity and anticarcinogenicity of carotenes and xanthophylls in relation to their chemical structures. Excited-state quenching improved with the length of the conjugated chain structure. Pro-vitamin A activity was dependent on the presence of at least one beta-ionyl ring structure. The effectiveness of carotenoids as antioxidants depended on their ability to trap peroxyl radicals with production of resonance-stabilized carotenyl radicals. The products identified from oxidations of carotenes and xanthophylls with molecular oxygen and other oxidizing agents are presented. The free radical-mediated mechanisms that have been proposed to account for the different classes of products are reviewed.



2019 ◽  
Vol 123 (38) ◽  
pp. 23342-23351
Author(s):  
Munisamy Venkatesan ◽  
Haraprasad Mandal ◽  
Madhu Chakali ◽  
Prakriti Ranjan Bangal


ACS Nano ◽  
2018 ◽  
Vol 12 (11) ◽  
pp. 10572-10575 ◽  
Author(s):  
Bingru Huang ◽  
Jan Bergstrand ◽  
Sai Duan ◽  
Qiuqiang Zhan ◽  
Jerker Widengren ◽  
...  


ACS Nano ◽  
2018 ◽  
Vol 12 (11) ◽  
pp. 10576-10577 ◽  
Author(s):  
Freddy T. Rabouw ◽  
P. Tim Prins ◽  
Pedro Villanueva-Delgado ◽  
Marieke Castelijns ◽  
Robin G. Geitenbeek ◽  
...  


2018 ◽  
Vol 293 (14) ◽  
pp. 5018-5025 ◽  
Author(s):  
Nikki Cecil M. Magdaong ◽  
Robert E. Blankenship


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