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

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov
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引用次数: 0

Abstract

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.

Abstract Image

Abstract Image

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
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。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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