Spectroscopic and computational studies of erythrosine food dye protonation in aqueous solution

Catalyst‐Free Photochemical Activation of Peroxymonosulfate in Xanthene‐Rich Systems for Fenton‐Like Synergistic Decontamination: Efficacy of Proton Transfer Process

“…Moreover, as H 3 [EB] + showed a significant positive charge, the intermolecular electrostatic attraction or hydro-gen bond structure would be generated, resulting in molecule self-aggregation, thus forming hydrophobic molecular clusters, which would precipitate and detach from the homogeneous solution system after a period of times (Figure 2b). [21] The research of Snigur and co-workers [17] have supported our discussions above, and pK a of H 3 [EB] + in each-order ionization based on tristimulus colourimetry…”

“…Moreover, as H 3 [EB] + showed a significant positive charge, the intermolecular electrostatic attraction or hydrogen bond structure would be generated, resulting in molecule self‐aggregation, thus forming hydrophobic molecular clusters, which would precipitate and detach from the homogeneous solution system after a period of times (Figure 2b). [21] The research of Snigur and co‐workers [17] have supported our discussions above, and p K a of H 3 [EB] + in each‐order ionization based on tristimulus colourimetry were given (3.50, 4.90 and 10.10, respectively). Synthesizing above explorations and previous studies about fluorescein structures, [20, 22] we proposed the pathways of EB protonation processes and the detailed mechanisms of ISR and IDR (Figure 2d).…”

Facile utility of felumin, a biological dye for the first fluorimetric determination of l-tetramisole drug through an “on–off fluorescence” strategy

“…For the dye, p K a1 is 3.8, p K a2 is 4.6, and p K a3 is 9.9. 44 If the media is slightly acidic, the main form of FLN is the monovalent species (HR − ). Carboxylic and hydroxylic groups in FLN could be ionized.…”

An innovative, low-cost and environment-friendly approach by using a deep eutectic solvent as the water substitute to minimize waste in the textile industry and for better clothing performance

“…It can be seen from the figure that, with the addition of the same amount of dye, although the absorption strength of the dye in the deep eutectic solvent was lower than that in the conventional aqueous bath, the range of the absorption spectrum of the dye in the deep eutectic solvent was wider than that in the conventional aqueous bath due to the difference in the protonation degree, as well as the H bonds and electrostatic force between the dye and the deep eutectic solvent. [45][46][47][48][49][50] These results indicate that the dispersion of the dye in the deep eutectic solvent was more regular and finer than that in the conventional aqueous bath, which was beneficial for the dyeing process. They also show that the deep eutectic solvent has the potential to be used as a medium for wool dyeing.…”