Synthesis and photophysics of novel biocompatible fluorescent oxocines and azocines in aqueous solution
作者:A. Ulises Acuña、Mónica Álvarez-Pérez、Marta Liras、Pedro B. Coto、Francisco Amat-Guerri
DOI:10.1039/c3cp52228h
日期:——
accompanying monardine ionization which may abolish de-excitation via intersystem crossing. A similar fluorogenic reaction takes place with catecholamines such as dopamine and DOPA, to yield fluorescent azocines 2a and 2b which, depending on pH, may be present as cationic, neutral or anionic species. TDDFT computations of these forms were also carried out to assign the corresponding excitation transitions
不同质子形式的强荧光半缩醛4,9-二羟基-1,2-二氢-4,11a-甲氧羰基[4,5 - b ]苯并呋喃-5(4 H)-(1a,莫纳ardine),氮杂类似物4,9-二羟基-3,4-二氢-1 H -4,11a-甲基苯并呋喃[2,3 - d ]偶氮素-5(2 H)-1(2a,氮莫尼丁)和各自的2-羧基衍生物(1b,2b)已通过实验和量子化学方法进行了研究。莫纳丁和羧莫纳丁分别是水溶液中羟基酪醇或丹酚酸的新型荧光室温反应的主要产物,它们具有独特的光物理性质。接近中性pH(p K a = 7.2)的黄嘌呤从弱发射,吸收紫外线的(382 nm)中性物质切换为吸收VIS(426 nm),发射蓝光(464 nm)的阴离子形式,并具有荧光量子产率φ ˚F = 1和单指数衰减τ ˚F= 2.74 ns。基于时间相关的密度泛函理论(TDDFT)计算,解释了这种从中性到阴离子形式的二元光谱变化,这是由于(i)
Fluorometric and Colorimetric Dual-Readout Immunoassay Based on an Alkaline Phosphatase-Triggered Reaction
作者:Jiahui Zhao、Shuang Wang、Shasha Lu、Guoyong Liu、Jian Sun、Xiurong Yang
DOI:10.1021/acs.analchem.9b01553
日期:2019.6.18
and convenience of ELISA in practical applications. Herein we have first prepared an original and creative substrate, named m-hydroxyphenyl phosphatesodium salt (m-HPP), with a desirable dephosphorylation site for ALP. On the basis of the ALP-catalyzed hydrolysis of m-HPP to resorcinol and its subsequent specific nucleophilic reaction with dopamine, we have exploited a fluorometric and colorimetric
An Enzyme Cascade-Triggered Fluorogenic and Chromogenic Reaction Applied in Enzyme Activity Assay and Immunoassay
作者:Jiahui Zhao、Shuang Wang、Shasha Lu、Xingfu Bao、Jian Sun、Xiurong Yang
DOI:10.1021/acs.analchem.8b01845
日期:2018.6.19
resorcinol. Therefore, an enzyme cascade system has been developed herein based on the ALP and tyrosinase coupled enzymes-triggered fluorogenic and chromogenic reaction. According to the direct relationship between the activity of ALP/tyrosinase and absorbance/fluorescence intensity of the resultant solution, the proposed enzyme cascade-triggered reaction was utilized for assaying ALP and tyrosinase activity
In Situ Fluorogenic and Chromogenic Reactions for the Sensitive Dual-Readout Assay of Tyrosinase Activity
作者:Jiahui Zhao、Xingfu Bao、Shuang Wang、Shasha Lu、Jian Sun、Xiurong Yang
DOI:10.1021/acs.analchem.7b02739
日期:2017.10.3
As a well-known copper-containing oxidase, tyrosinase has been anticipated to serve as the biomarker of skin diseases. We describe here an exquisite label-freefluorescent and colorimetric dual-readout assay of its activity, inspired by the specific oxidation ability of monophenolamine substrates to catecholamines and a unique fluorogenic reaction between resorcinol and catecholamines. By employing