Protolytic fluorescein species evaluated using chemometry and DFT studies

Batistela, Vagner Roberto; Cedran, Jaime da Costa; Oliveira, Hueder Paulo Moisés de; Scarmínio, Ieda Spacino; Ueno, Leonardo T.; Machado, Antônio Eduardo da Hora; Hioka, Noboru

doi:10.1016/j.dyepig.2009.11.002

Cited by 68 publications

(31 citation statements)

References 51 publications

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“…It should be mentioned, however, that the detailed ionization scheme of the mother compound, fluorescein, in water [4,6,[19][20][21][22][23] and non-aqueous solvents was already studied in full and reported in a set of publications [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Ionization and tautomerism of methyl fluorescein and related dyes

Mchedlov‐Petrossyan

Cheipesh

Shekhovtsov

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Introductionmentioning

confidence: 99%

“…Nowadays, much attention has been given to the structure, absorption, and fluorescence of fluorescein dyes in solution [1][2][3][4][5][6][7][8][9]. The recent studies of the structure and spectra in the gas phase are of special interest [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Ionization and tautomerism of methyl fluorescein and related dyes

Mchedlov‐Petrossyan

Cheipesh

Shekhovtsov

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…For the sodium ion D + = 13.3 × 10 The valency of fluorescein is taken to be Z − = 2 at a pH ≈ 9 [34], and the valency of sodium is Z + = 1. In the expressions leading to Equation (4), which have been derived for a symmetric electrolyte, we take Z = 2 (magnitude of the highest valency of the counterions).…”

Section: Resultsmentioning

confidence: 99%

Diffusiophoretic enhancement of mass transfer by nanofluids

Dhuriya

Dalia

Sunthar

2018

Chemical Engineering Science

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Observations of an enhanced mass transfer in nanofluids have led to several propositions for the underlying cause, but none of them have been clearly established. Here, we reproduce the enhancement phenomenon within a glass capillary containing fluorescein di-sodium dye solution on one side and alumina nanoparticle suspension on the other, avoiding convective interferences present earlier. The enhancement is explained by the counterconvective motion of the dye solution in response to the diffusiophoretic motion of the nanoparticles towards a higher concentration of the dye. The velocity of the dye front agrees with the theoretical estimate obtained from the diffusiophoretic velocity of alumina nanoparticles in a gradient of fluorescein di-sodium electrolyte solution. With a suitably chosen nanofluid, it should now be possible to effect the enhancement (or suppression) of mass transfer of a given solute.

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“…At this pH, FSC is mostly in the dianion protolytic form (91%), with a calculated pKa of 6.2 (Batistela et al 2010, Sjöback et al 1995, which corresponds to the phenolic group. All other PS at pH 7.25 were found in the dianionic form due to an approximate pKa of 4 (Batistela et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the photodynamic activity of Xanthene Dyes on Artemia salina described by chemometric approaches

Pellosi

Batistela

Souza

et al. 2013

An. Acad. Bras. Ciênc.

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The development of drugs for photodynamic therapy (PDT) is an important area of research due to their growing use in medical applications. Therefore, it is important to develop new bioassay methods for PDT photosensitizers that are inexpensive, easy to handle and highly sensitive to environmental conditions. Xanthene dyes (fluorescein, rose bengal B, erythrosine B and eosin Y) with LED light sources were investigated using Artemia salina as a bioindicator of photodynamic activity. In this study, three factors were investigated: (i) photosensitizers concentration, (ii) the LED irradiation time and (iii) the waiting time between the addition of the photosensitizers and the beginning of the irradiation. To analyze the photokilling of A. salina, it was employed a 2 3 full factorial design. The death of A. salina was related to dye structure and the interaction between the irradiation time and the photosensitizers concentration. About 60% of crustaceans death was obtained using rose bengal B, which presentes the highest quantum yield of singlet oxygen due to the number of iodide substituents in the xanthenes ring. The proposed bioassay using A. salina, xanthene dyes and LED irradiation was found suitable for quantitative PDT drug evaluation.

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Protolytic fluorescein species evaluated using chemometry and DFT studies

Cited by 68 publications

References 51 publications

Ionization and tautomerism of methyl fluorescein and related dyes

Ionization and tautomerism of methyl fluorescein and related dyes

Diffusiophoretic enhancement of mass transfer by nanofluids

Evaluation of the photodynamic activity of Xanthene Dyes on Artemia salina described by chemometric approaches

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