Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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TL;DR: The initial rate of the eosin Y CL reaction was dependent on the membrane permeability of the liposomes, and the reproducibility of the initial rate was better than that with fluorescein and phloxin B.
Abstract: The initial rate of horseradish peroxidase (HRP)-catalysed chemiluminescence (CL) reaction in an aqueous compartment of liposomes was applied to the estimation of membrane permeability of liposomes. HRP-encapsulated liposomes were prepared by an extrusion method, and a CL reagent and H2O2 were added into the liposomes suspensions. Fluorescein, eosin Y and phloxin B, which are xanthene dyes with different chemical structures, were used as CL reagents. Xanthene dye and H2O2 permeate into the inner phase of liposomes, resulting in initiation of the HRP-catalysed xanthene dye CL reaction with H2O2. The initial rate of the CL reaction was independent of the xanthene dye used. The reproducibility of the initial rate with eosin Y was better than that with fluorescein and phloxin B. When the membrane permeability of the liposomes was changed by altering the concentration of cholesterol in them, the initial rate of the eosin Y CL reaction was dependent on the membrane permeability of the liposomes. Copyright © 2007 John Wiley & Sons, Ltd.
5 citations
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TL;DR: In this article, a method was described in which Amberlite XAD-2 is used as an adsorbent for the isolation of synthetic water-soluble food dyes and for the detection of the dyes by thin-layer chromatography.
5 citations
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TL;DR: A fly ash supported NiO (FA-NiO) nanocomposite solid heterogeneous catalyst has been prepared by impregnation of Ni(NO3)2 · 6H2O on thermally activated fly ash (FA) support FT-IR spectroscopy, X-ray diffraction analysis, scanning electron microscopy, TEM and BET techniques were employed to characterize the catalyst.
Abstract: A novel fly ash supported NiO (FA–NiO) nanocomposite solid heterogeneous catalyst has been prepared by impregnation of Ni(NO3)2 · 6H2O on thermally activated fly ash (FA) support FT-IR spectroscopy, X-ray diffraction analysis, scanning electron microscopy, TEM and BET techniques were employed to characterize the catalyst The catalytic adeptness of FA–NiO was tested and optimized in xanthene formation Catalyst gave very high yield and good purity Stability of the catalyst could be promising as it easily recovered and reused giving a similar yield up to four cycles FA–NiO is an efficient catalyst providing an environmentally clean process for xanthene formation and for developing a revolutionary way to use the majority of waste fly ash Further, we have also performed docking simulation between 1ONF and a xanthene molecule to evaluate binding orientation and affinity of the ligand
5 citations
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TL;DR: In this article , the authors have outlined the element substitution strategy, and extended O-xanthene with carbon at the periphery, and triangulenium ion and discussed the substituent effect on the photophysical properties.
5 citations
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TL;DR: In this article, the effect of 1,4-diazabicyclo [2.2] octane, β... has been explained for dye-sensitized photoelimination of HMTC.
Abstract: The photoelimination of hexamethyleneammonium hexamethylenedithiocarbamate (HMTC) can be sensitized by xanthene dyes, such as rose bengal and eosine yellowish. In contrast to the direct photolysis results, the presence of HMTC in the dye-sensitized decomposition produces no carbon disulfide and consumes oxygen during the irradiation. The quantum yield of photoelimination in an aerated ethanol solution was measured. The quantum yield was almost unchanged on the variation of the xanthene dye concentration from 10−5 to 10−6M. This is different from the former observation that there was an apparent tendency for the quantum yield to decrease monotonously with an increase in the thiazine dye concentration. The singlet oxygen mechanism, in which the photochemical reaction is initiated by the interaction between the triplet dye and the ground-state oxygen molecules, has been inferred for the dye-sensitized photoelimination of HMTC. It has been explained in terms of the effect of 1,4-diazabicyclo [2.2.2] octane, β...
4 citations