Alginic acid as a stabilizer of zirconia suspensions in the presence of cationic surfactants

Grządka, E.; Matusiak, Jakub; Godek, E.

doi:10.1016/j.carbpol.2020.116634

Cited by 12 publications

(4 citation statements)

References 39 publications

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“…On the other hand, for PDADMAC-APG mixtures, no process can be expected to drive the system towards electroneutrality on dilution. Therefore, elucidating the origin of dilution-induced phase separation in polyelectrolyte–surfactant mixtures remains a challenge [ 34 , 35 , 36 , 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Dilution-Induced Deposition of Concentrated Binary Mixtures of Cationic Polysaccharides and Surfactants

Fernández-Peña,

Guzmán,

Oñate-Martínez

et al. 2023

Polymers

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This work investigates the effect of dilution on the phase separation process of binary charged polysaccharide–surfactant mixtures formed by two cationic polysaccharides and up to four surfactants of different nature (anionic, zwitterionic, and neutral), as well as the potential impact of dilution-induced phase separation on the formation of conditioning deposits on charged surfaces, mimicking the negative charge and wettability of damaged hair fibers. The results obtained showed that the dilution behavior of model washing formulations (concentrated polysaccharide–surfactant mixtures) cannot be described in terms of a classical complex precipitation framework, as phase separation phenomena occur even when the aggregates are far from the equilibrium phase separation composition. Therefore, dilution-enhanced deposition cannot be predicted in terms of the worsening of colloidal stability due to the charge neutralization phenomena, as common phase separation and, hence, enhanced deposition occurs even for highly charged complexes.

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Section: Resultsmentioning

confidence: 99%

Dilution-Induced Deposition of Concentrated Binary Mixtures of Cationic Polysaccharides and Surfactants

Fernández-Peña,

Guzmán,

Oñate-Martínez

et al. 2023

Polymers

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“…However, considering the neutral character of the surfactant, it could not be clearly stated whether the working concentrations at the phase-separation region had already been exceeded or whether it had not yet been reached, but it was clear that the phase separation, if it occurs, could not be mediated through the neutralization of the polymer charges. Further insights on the complex formation process may be obtained from electrophoretic mobility and surface tension measurements, especially for diluted mixtures [ 50 , 51 , 52 ]. However, the use of the interpretation of the results obtained from these techniques in concentrated mixtures such as those studied in this work remains challenging.…”

Section: Resultsmentioning

confidence: 99%

Study of the Dilution-Induced Deposition of Concentrated Mixtures of Polyelectrolytes and Surfactants

et al. 2022

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Mixtures of polyelectrolytes and surfactants are commonly used in many technological applications where the challenge is to provide well-defined modifications of the surface properties, as is the case of washing formulations in cosmetics. However, if contemporary experimental and theoretical methods can provide insights on their behavior in concentrated formulations, less is known on their behavior under practical use conditions, e.g., under dilution and vectorization of deposits. This makes it difficult to make predictions for specific performance, as, for example, good hair manageability after a shampoo or a comfortable sensorial appreciation after a skin cleanser. This is especially important when considering the formulation of new, more eco-friendly formulations. In this work, a detailed study of the phase separation process induced by dilution is described, as well as the impact on the deposition of conditioning material on negatively charged surfaces. In order to gain a more detailed physical insight, several polyelectrolyte–surfactant pairs, formed by two different polymers and five surfactants that, although non-natural or eco-friendly, can be considered as models of classical formulations, have been studied. The results evidenced that upon dilution the behavior, and hence its deposition onto the surface, cannot be predicted in terms of the behavior of simpler pseudo-binary (mixtures of a polymer and a surfactant) or pseudo-ternary mixtures (two polymers and a surfactant). In many cases, phase separation was observed for concentrations similar to those corresponding to the components in some technological formulations, whereas the latter appeared as monophasic systems. Therefore, it may be assumed that the behavior in multicomponent formulations is the result of a complex interplay of synergistic interactions between the different components that will require revisiting when new, more eco-sustainable ingredients are considered.

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“…AA is composed of D-mannuronic and L-guluronic acid with β-1→4-linkage, and the chain length would be different depending on extraction conditions, which could also significantly affect its physicochemical properties and biological functions [ 29 ]. TP5 is an immunocompetent polypeptide with no side effects and has been widely applied to improve immunological indices in hosts bearing immune deficiency diseases [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

The Protective Effects of Water-Soluble Alginic Acid on the N-Terminal of Thymopentin

Ji,

Fan,

Gao

et al. 2023

Molecules

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Thymopentin (TP5) has exhibited strong antitumor and immunomodulatory effects in vivo. However, the polypeptide is rapidly degraded by protease and aminopeptidase within a minute at the N-terminal of TP5, resulting in severe limitations for further practical applications. In this study, the protective effects of water-soluble alginic acid (WSAA) on the N-terminal of TP5 were investigated by establishing an H22 tumor-bearing mice model and determining thymus, spleen, and liver indices, immune cells activities, TNF-α, IFN-γ, IL-2, and IL-4 levels, and cell cycle distributions. The results demonstrated that WSAA+TP5 groups exhibited the obvious advantages of the individual treatments and showed superior antitumor effects on H22 tumor-bearing mice by effectively protecting the immune organs, activating CD4+ T cells and CD19+ B cells, and promoting immune-related cytokines secretions, finally resulting in the high apoptotic rates of H22 cells through arresting them in S phase. These data suggest that WSAA could effectively protect the N-terminal of TP5, thereby improving its antitumor and immunoregulatory activities, which indicates that WSAA has the potential to be applied in patients bearing cancer or immune deficiency diseases as a novel immunologic adjuvant.

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Alginic acid as a stabilizer of zirconia suspensions in the presence of cationic surfactants

Cited by 12 publications

References 39 publications

Dilution-Induced Deposition of Concentrated Binary Mixtures of Cationic Polysaccharides and Surfactants

Dilution-Induced Deposition of Concentrated Binary Mixtures of Cationic Polysaccharides and Surfactants

Study of the Dilution-Induced Deposition of Concentrated Mixtures of Polyelectrolytes and Surfactants

The Protective Effects of Water-Soluble Alginic Acid on the N-Terminal of Thymopentin

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