Erythrosine B

Narayanan V.A., Stokes D.L., Vo-Dihn T., Vibrational spectral-analysis of eosin-y and erythrosin-b - intensity studies for quantitative detection of the dyes, J. Raman Spectrosc. 1994 25 415-422. 

A thin film dissolved oxygen sensor was fabricated by entrapping erythrosin B in a sol-gel matrix95. The silica sol-gel doped with the dye was deposited onto the cleaned glass slides by the spin-coating method. The sensor was linear in the most useful range of dissolved oxygen concentrations, up to 9.1 mg l 1 concentration obtained in air saturated water at 20 °C. 

Bailey R.T., Cruickshank F.R., Deans G., Gillanders R.N., Tedford M.C., Characterization of a fluorescent sol-gel encapsulated erythrosine B dissolved oxygen... 

Fig. 2.32. Chromatograms obtained at 420 and 500 nm for pure cochineal (a) and for cochineal adulterated by erythrosin (b), at a concentration of 0.35 X10-3 kg per kg cochineal, and by trans-fi-carotene (c) at a concentration of 6X10-3 kg per kg cochineal. Cochineal pigments dcH, dcIH, dcIV and dcVII, unknown pigments of D. coccus Costa ca, carminic acid fl, flavokermesic acid and ka, kermesic acid. marks the peak of the added colourant. Reprinted with permission from M. Gonzalez et al. [72].

Kamat, PV., Fox, M.A. 1983. Photo-sensitization of TiO, colloids by Erythrosin-B in acetonitrile. Chem Phys Lett 102 379-384. 

Chlorine eg Hematoporphyrin Methylene Blue Rose Bengal Erythrosin B Sulforhodamin B Acridine Orange Eosin Y Fluorescein Riboflavin... 

Table 6. Column chromatography of aqueous Erythrosine B samples over a 3.0 cm (id) column packed with 130 ml of Octolig at a flow rate of 10 mL/min (50-mL aliquots were collected and concentrations of fractions 4-10 were measured spectrophotometrically) [44]...

To generate the phosphorane, Magnone [80,81], Wang et al. [82] and John and Paust [83] used respectively sodium methoxide, triethylamine/MgCh in JV,A/-dimethylacetamide and LiOH in N,N-dimethylformamide. For the isomerization step, the two first authors emploied rose Bengal as photosensitizer and the latter Erythrosine B, to give isotretinoin, Fig. (45). 

II, 0.04 moles Erythrosine B, and 6.8% polyethylene ether was spotted on a com. filter paper, the acetone evapd., and the paper irradiated with a flash > 470 mm , giving an intense light intensity for the irradiated compn. compared to no intensity for a control without sensitizer. 

Dyes such as erythrosin B [172], eosin [173-177], rose bengal [178,179], rhodamines [180-185], cresyl violet [186-191], thionine [192], chlorophyll a and b [193-198], chlorophyllin [197,199], anthracene-9-carboxylate [200,201], perylene [202,203] 8-hydroxyquinoline [204], porphyrins [205], phthalocyanines [206,207], transition metal cyanides [208,209], Ru(bpy)32+ and its analogs [83,170,210-218], cyanines [169,219-226], squaraines [55,227-230], and phe-nylfluorone [231] which have high extinction coefficients in the visible, are often employed to extend the photoresponse of the semiconductor in photoelectro-chemical systems. Visible light sensitization of platinized Ti02 photocatalyst by surface-coated polymers derivatized with ruthenium tris(bipyridyl) complex has also been attempted [232,233]. Because the singlet excited state of these dyes is short lived it becomes essential to adsorb them on the semiconductor surface with... 

Figure 1..5. Schematic presentation of the cascade reaction between Erythrosin B and cis-DMAAS (Papper and Likhtenshtein, 2001). Reproduced with permission.

The triplet-photochrome labeling method has been used to study very rare encounters in a system containing the Erythrosin B sensitiser and SITC photochrome probe (Mekler and Likhtenshtein, 1986). Both types of the molecules were covalently bound to a-chymotrypsin. The photoisomerisation kinetics was monitored by fluorescence decay of the frans-SITS. The rate constants of the triplet-triplet energy transfer between Erythrosin B and SITS (at room temperature and pH 7) were found k,r = 2 xlO7 NT s-1 and ktT = 107 M V. It should be emphasized that the concentration of the triplet sensitiser attached to the protein did not exceed 10 7 M in those experiments, and the collision frequencies were close to 10 s 1 which are 8-9 orders of magnitude less than those measured with the regular luminescence or ESR techniques. 

The carbodiimide mediated attachment of dye molecules, such as 5(6)-carboxyfluoresceine or rhodamine B to the model compound penylethylamine proceeds in 78 % and 63 % yields, respectively, using diisopropylcarbodiimide, three equivalents of pyridinium-p-toluenesulfonate (PPTS) and two equivalents of diisopropylethylamine (DIPEA). The above conditions are especially useful when the sodium salts of dyes are used. Examples are eosine Y, erythrosin B and phloxine B because yields of >90 % are obtained when the reactions are conducted in DMF in the presence of HOBt. ... 

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