Spectrofluorimetric determination of trace nitrite with a novel fluorescent probe
摘要:
A simple, sensitive and selective fluorimetric determination for trace nitrites was developed using an unsymmetrical rhodamine with a high fluorescence quantum yield and large Stokes shift. The method is based on the reaction of the unsymmetrical rhodamine with nitrite in an acidic medium to form a nitroso product, which has much lower fluorescence because the electron-withdrawing effect of the nitroso group influences the system of p-pi conjugation between N atom and benzene ring. Under optimum conditions, the fluorescence quenching intensity is linear over a nitrite concentration range of 1.0 x 10(-8) to 3.5 x 10(-7) M. The detection limit is 2.0 x 10(-10) M (S/N = 3). The method was applied to the determination of nitrite in tap water and lake water with satisfactory results. The mechanism for the reaction is also reported. (C) 2009 Elsevier B.V. All rights reserved.
SMMR (small molecule metabolite reporters) for use as in vivo glucose biosensors
申请人:Bellott M. Emile
公开号:US20070110672A1
公开(公告)日:2007-05-17
Small Molecule Metabolite Reporters (SMMRs) for use as in vivo glucose biosensors, sensor compositions, and methods of use, are described. The SMMRs include boronic acid-containing xanthene, coumarin, carbostyril and phenalene-based small molecules which are used for monitoring glucose in vivo, advantageously on the skin.
Altering Fundamental Trends in the Emission of Xanthene Dyes
作者:Lei G. Wang、Ian Munhenzva、Martha Sibrian-Vazquez、Jorge O. Escobedo、Catherine H. Kitts、Frank R. Fronczek、Robert M. Strongin
DOI:10.1021/acs.joc.8b03030
日期:2019.3.1
enable researchers and clinicians to visualize biological events in living cells, tissues, and organs in real time. Herein, the focus is on the structure and properties of the relatively rare benzo[ a]xanthenes that exhibit enhanced steric and electronic interactions due to their annulated structures. Three types of fluorophores were synthesized: (i) pH- and solvent-dependent seminaphthorhodafluors, (ii)
[EN] NEW FLUORESCENT DYES AND THEIR USES AS BIOMARKERS<br/>[FR] NOUVEAUX COLORANTS FLUORESCENTS ET LEURS UTILISATIONS EN TANT QUE BIOMARQUEURS
申请人:ILLUMINA CAMBRIDGE LTD
公开号:WO2018060482A1
公开(公告)日:2018-04-05
The present application relates to new fluorescent dyes and their uses as fluorescent labels. The compounds may be used as fluorescent labels for nucleotides in nucleic acid sequencing applications.
本申请涉及新的荧光染料及其作为荧光标记物的用途。这些化合物可用作核酸测序应用中核苷酸的荧光标记物。
NOVEL NON-FLUORESCENT RHODAMINES
申请人:THE UNIVERSITY OF TOKYO
公开号:US20210087160A1
公开(公告)日:2021-03-25
A novel non-fluorescent rhodamine dye forms a twisted intramolecular charge transfer state. A substituent that causes steric hindrance is introduced at an ortho position of a dimethylamino group on the xanthene ring of tetramethylrhodamine, which is a general rhodamine that exhibits strong fluorescence, and a certain amount of twist is imparted in a ground state. As a result, the formation of the twisted intramolecular charge transfer state is promoted in the excited state and non-fluorescence is exhibited.
conjugation structures but exhibit tunable photophysical properties. N-NIR and S-NIR have large extinction coefficients over 100,000, and highfluorescencequantumyields. Although NIR absorption and emission of K-NIR are inferior to the former two, it emits at much longerwavelength region. And all the three dyes can easy pass through the cell membranes to obtain the high-resolution NIR fluorescent images. Further