• Journal of the Society of Cosmetic Scientists of Korea
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• v.44 no.3
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• pp.303-316
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• 2018

In this study, I investigated the applicability of fluorescein-derived xanthene dyes to fluorescent pigment and the controllability of the optical properties of manufactured pigments. Eosin Y (D&C Red No.22) and phloxine B (D&C Red No.28) were mainly used as a dye to prepare the pigment. Dyes dissolved in a solvent were poured into a powder dispersed in the solvent, then dried and pulverized to fabricate the pigments. Optical characteristics related with fluorescence of the prepared pigment were measured. The optical properties of pigments were varied depending on the solvent used, content of the dye in the pigment, and the ratio of dyes when more then two dyes were mixed. According to the experiment result, it seems that some of the dyes attached to the powder showed fluorescence while the rest did not contribute to it. From the result of pigment washing experiment to explore the binding (or interaction) strength and characteristics of the powder-dye system constituting the pigment, it seems that there are two or more different interactions existing in the pigment system, one of which is relatively stronger than the solvent-dye interaction.

• Textile Coloration and Finishing
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• v.26 no.3
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• pp.272-276
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• 2014

The functional materials have been developed as a promising research topic toward the end uses for organic materials and applications. In this study, fluorescein based dye was synthesized by three step reaction. We have designed and synthesized the colorimetric dye through the reactions of fluorescein and methoxy group and ethylene diamine and squaric acid. The structure of the non-fluorescent spirolactam was elucidated by $^1H$-NMR, LC-Mass and FT-IR analyzes. Further studies are in progress to understand the effects of various substituent during the recognition process and to develop fluorescein based sensors for cations or anions.

• Journal of Photoscience
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• v.10 no.3
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• pp.219-223
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• 2003

Phloxine B (2,4,5,7-tetrabromo-4,5,6,7-tetrachlorofluorescein disodium salt), also referred as D&C red dye no. 28, is phototoxic to many insects such as Tephritidae fruit flies. Sunlight photolysis of phloxine B in aqueous solutions was a first order kinetic reaction at low concentrations. But it turned to be more complex reactions with the increase of phloxine B concentration. The half-lives of phloxine B (6-120 ${\mu}$M) were 18-41 and 52-289 hours in oxygenated and deaerated distilled water, respectively. The photolysis rate constants increased as the phloxine B concentrations increased. The singlet oxygen formation positively correlated with the concentrations of phloxine B and humic acid in oxygenated distilled water. The formation of singlet oxygen did not stop even after the complete degradation of phloxine B, which suggested an involvement of photoproduct-mediated reactions. The results showed that singlet oxygen mediated photooxidation was a dominant reaction for phloxine B dissipation in an aqueous solution, and the self-sensitized and photoproduct-mediated reactions were also involved at the higher concentrations. Iodide and bromide ions significantly decreased phloxine B photolysis rate constants, which were in relation to the decrease of singlet oxygen formation.

• Journal of the Korean Chemical Society
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• v.36 no.1
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• pp.75-80
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• 1992

The electrochemical spectral sensitization of a $SnO_2$ electrode with eosin B, a Xanthene dye, has been studied in acetonitrile. Measurements of the photocurrent have been carried out in the presence of supersensitizers such as thiourea, 1-allyl-2-thiourea, NaSCN, and NaI. The magnitude of the supersensitized photocurrent was greater than that of the sensitized photocurrent for all of the supersensitizers studied. However, the long time span of irradiation causes a significant decrease of the supersensitized photocurrent as well as the absorbance. These results, together with infrared spectra and fluorescence spectra, are taken into account to elucidate the mechanism of photoreaction between eosin B and supersensitizers in acetonitrile.