Mechanism of dye solubilization and de-aggregation by urea

Perry, James M.; Kanasaki, Yu; Karadakov, Peter B.; Shimizu, Seishi

doi:10.1016/j.dyepig.2021.109530

Cited by 4 publications

(11 citation statements)

References 79 publications

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“…The difference G u2 À G u1 represents the preferential affinity between a solute and cosolvent in comparison with the affinity between solute and water, which in this case leads to an increase in solubility. This preferential affinity can be estimated using: [65] À @ln…”

Section: Comparing the Solubilization Of Amide And Alkane Moieties By...supporting

confidence: 60%

“…It can be clearly seen that urea addition increases the solubility of these two molecules in a monotonic fashion that can be adequately correlated linearly. Both acetaminophen and 4-tertbutylphenol are relatively low solubility [63] compounds, therefore, the effect of cosolvent addition upon their solubility can be expressed as: [65] @ln…”

Section: Comparing the Solubilization Of Amide And Alkane Moieties By...mentioning

confidence: 99%

“…[63,64] We have analyzed urea effects upon the solubility of these two compounds by applying the Kirkwood-Buff analysis suggested by Shimizu. [65] Our results show that even though acetaminophen participates in a larger number of H-bonds with solvent relative to 4tertbutylphenol, urea preferentially solvates 4-tertbutylphenol to a somewhat larger degree. Given that both molecules share a common phenol moiety, this indicates that urea preferentially interacts with amide and alkyl groups in a similar fashion.…”

Section: Introductionmentioning

confidence: 99%

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Does Urea Preferentially Interact with Amide Moieties or Nonpolar Sidechains? A Question Answered Through a Judicious Selection of Model Systems

et al. 2022

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The transfer model suggests that urea unfolds proteins mainly by increasing the solubility of the amide backbone, probably through urea-induced increase in hydrogen bonding. Other studies suggest that urea addition increases the magnitude of solvent-solute van der Waals interactions, which increases the solubility of nonpolar sidechains. More recent analyses hypothesize that urea has a similar effect in increasing the solubility of backbone and sidechain groups. In this work, we compare the effects of urea addition on the solvation of amides and alkyl groups. At first, we study the effects of urea addition upon solvent hydrogen bonding acidity and basicity through the perturbation in the fluorescence spectrum of probes 1-AN and 1-DMAN. Our results demonstrate that the solvent's hydrogen bonding properties are minimally affected by urea addition. Subsequently, we show that urea addition does not perturb the intra-molecular hydrogen bonding in salicylic acid significantly. Finally, we investigate how urea preferentially interacts with amide and alkyl groups moieties in water by comparing the effects of urea addition upon the solubility of acetaminophen and 4-tertbutylphenol. We show that urea affects amide and tbutyl solubility (lowers the transfer free energy of both amide (backbone) and alkyl (sidechain) groups) in a similar fashion. In other words, preferential interaction of urea with both moieties contributes to protein denaturation.

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Section: Comparing the Solubilization Of Amide And Alkane Moieties By...supporting

confidence: 60%

Section: Comparing the Solubilization Of Amide And Alkane Moieties By...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Does Urea Preferentially Interact with Amide Moieties or Nonpolar Sidechains? A Question Answered Through a Judicious Selection of Model Systems

et al. 2022

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“…Dyeing heat, △H°, represents heat change in the dyeing process. It refers to the heat generated during the transfer of 1 mol of acid dye from the dye bath to spandex in a standard state [ 19 , 20 , 21 , 22 ]. If it is greater than zero, the dyeing process is endothermic; otherwise, it is exothermic.…”

Section: Resultsmentioning

confidence: 99%

“…Measuring the dyeing rate curve: the spandex was dyed at 100 °C for 5 min, 10 min, 15 min, 20 min, 30 min, 40 min, 50 min, 60 min, 80 min, 100 min, 120 min, 140 min, respectively, in a dye bath of liquor ratio of 100:1 using 1 g/L acid leveling agent and maintaining a pH of 4.5 (acetic acid-sodium acetate: 10–8 g) [ 19 , 20 , 21 , 22 , 23 ]. The dye concentration was 2% (o.w.f).…”

Section: Methodsmentioning

confidence: 99%

An Investigation into the Adsorption Mechanism of Organic Anions on a New Spandex

et al. 2022

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In recent years, there has been significant interest in the study of spandex in high-elasticity sensors. As a new kind of special spandex, dyeable spandex shows strong adsorption capacity for anions. In this study, neutral red G was used as an anion adsorption simulator to study the adsorption mechanism of dyeable spandex on anionic materials. The structure of dyeable spandex was characterized by the modern instrumental analysis method, and the adsorption kinetics and thermodynamics of neutral red G on dyeable spandex were discussed. The results show that the use of mixed amines as chain extenders for dyeable spandex reduced the regularity of molecules and the crystallinity of spandex, which was beneficial to the diffusion adsorption of anions. On the other hand, the number of secondary amino groups increased, providing more adsorption sites under acidic conditions. The adsorption of neutral red G on dyeable spandex satisfied the quasi-second-order kinetics and the Langmuir adsorption model, indicating that dye adsorption on spandex was mainly electrostatic. The diffusion coefficient and equilibrium adsorption capacity of neutral red G on dyeable spandex increased significantly, whereas enthalpy and entropy decreased.

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Effect of pore structure on the adsorption capacities to different sizes of adsorbates by ferrocene-based conjugated microporous polymers

Cao

Wang

Peng

et al. 2021

Polymer

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Mechanism of dye solubilization and de-aggregation by urea

Cited by 4 publications

References 79 publications

Does Urea Preferentially Interact with Amide Moieties or Nonpolar Sidechains? A Question Answered Through a Judicious Selection of Model Systems

Does Urea Preferentially Interact with Amide Moieties or Nonpolar Sidechains? A Question Answered Through a Judicious Selection of Model Systems

An Investigation into the Adsorption Mechanism of Organic Anions on a New Spandex

Effect of pore structure on the adsorption capacities to different sizes of adsorbates by ferrocene-based conjugated microporous polymers

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