含壳聚糖和电解质的半胱氨酸-银溶液中的自组织和凝胶化过程

IF 1.4 4区 化学 Q4 CHEMISTRY, PHYSICAL Colloid Journal Pub Date : 2024-05-30 DOI:10.1134/S1061933X24600143
G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov
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引用次数: 0

摘要

摘要 通过紫外光谱、动态光散射、pH计、粘度计和扫描电子显微镜等多种物理化学方法,研究了L-半胱氨酸和硝酸银(半胱氨酸-银溶液,CSS)、低分子量水溶性壳聚糖(CS)和凝胶引发剂CuSO4在低浓度水溶液中的自组装和凝胶化过程。研究发现,在壳聚糖(CS)和硫酸铜的作用下,作为凝胶前体的 CSS 在较窄的浓度范围内发生凝胶化:CCH = 0.0100-0.0150 mg/mL, \({{C}_{text{CuS}}{{text{O}}_{{text{4}}}}}}}) = 0.4-0.6 mМ, CL-cys = 3.当 Ag+/Cys 摩尔比为 1.27 时,CL-cys = 3.不同CSS-CS和CSS-CS-CuSO4组成的水凝胶没有很高的机械强度,但在一定时间内是稳定的。CSS 的结构元素,即茂金属银 (SM) 齐聚物的簇链,带正电荷,因此 CSS-CS 和 CSS-CS-CuSO4 水凝胶中不会发生多电解质络合,因为 CSS 的 pH 值为 2.6。在 CSS-CS 样品中加入 CuSO4 会促进形成更强的水凝胶,这是由于 SM 簇和 CS 分子与硫酸根阴离子结合,以及 Cu(II) 离子与不同簇的去质子化羧基配位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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The Self-Organization and Gelation Processes in a Cysteine–Silver Solution Containing Chitosan and an Electrolyte

The self-assembly and gelation processes in low-concentrated aqueous solutions of L-cysteine and silver nitrate (cysteine–silver solution, CSS); low-molecular-weight water-soluble chitosan (CS); and a gelation initiator, CuSO4, have been studied by various physicochemical methods, namely, UV spectroscopy, dynamic light scattering, pH-metry, viscometry, and scanning electron microscopy. It has been found that the gelation of CSS, which is used as a gel precursor, under the action of chitosan (CS) and copper sulfate occurs in a narrow concentration range: CCH = 0.0100–0.0150 mg/mL, \({{C}_{{{\text{CuS}}{{{\text{O}}}_{{\text{4}}}}}}}\) = 0.4–0.6 mМ, CL-cys = 3.00 mМ, and \({{C}_{{{\text{AgN}}{{{\text{O}}}_{{\text{3}}}}}}}\) = 3.75 mM, when Ag+/Cys molar ratio is 1.27. Hydrogels of various CSS–CS and CSS–CS–CuSO4 compositions possess no high mechanical strength; however, they are stable in the course time. The structural elements of CSS, i.e., cluster chains of silver merchaptide (SM) zwitterions, are positively charged; therefore, no polyelectrolyte complexation occurs in CSS–CS and CSS–CS–CuSO4 hydrogels, because the pH of CSS is 2.6. Addition of CuSO4 to CSS–CS samples promotes the formation of a more strong hydrogel due to the association of SM clusters and CS molecules with sulfate anions and the coordination of Cu(II) ions with deprotonated carboxyl groups of different clusters.

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来源期刊
Colloid Journal
Colloid Journal 化学-物理化学
CiteScore
2.20
自引率
18.20%
发文量
36
审稿时长
6-12 weeks
期刊介绍: Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.
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