[EN] SUBSTITUTED HYDROXYSTILBENE COMPOUNDS AND DERIVATIVES SYNTHESIS AND USES THEREOF [FR] SYNTHÈSE DE COMPOSÉS ET DE DÉRIVÉS HYDROXYSTILBÈNE SUBSTITUÉS ET UTILISATIONS DE CEUX-CI
Diphenylpolyene-cholesterol conjugates as fluorescent probes for microheterogeneous media
摘要:
Extrinsically conjugated fluorescent diphenylpolyene cholesterol derivatives are synthesized and spectroscopic investigations in homogeneous and aqueous micellar solutions are described. The emission of these cholesterol conjugates reveals characteristic intra-molecular charge transfer (ICT) behaviour in homogeneous solvents with a mono-exponential decay. Spectroscopic evidence in micellar aqueous solutions reveals a bi-exponential decay. This indicates the presence of two preferred locations of the cholesterol conjugated diphenylpolyenes sites of lower polarity and interfacial sites. The sensitivity of these fluorophores was utilized to determine the critical micelle concentrations. (C) 2014 Elsevier B.V. All rights reserved.
Single biomolecules can be detected with the aid of new labels that absorb visible light and fluoresce by intramolecular charge transfer. The intensity of the fluorescence is highly dependent upon the environment of the fluorophore, and decreases greatly with increasing polarity.
Selective Detection of the Carbohydrate-Bound State of Concanvalin A at the Single Molecule Level
作者:James J. La Clair
DOI:10.1021/ja964366g
日期:1997.8.1
A Colorimetric Ligand for Mercuric Ion
作者:Oliver Brümmer、James J. La Clair、Kim D. Janda
DOI:10.1021/ol990730f
日期:1999.8.1
[GRAPHICS]Practical materials are needed to expedite the detection and screening of heavy metals. This Letter describes the synthesis of a new phosphorodithioate-based ligand 1 that specifically communicates a color change when exposed to mercuric ion, The origin of this recognition arises through a charge transfer and solubility change. This ligand now extends a new means to visually screen and spectroscopically quantify mercuric ion.