G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov
{"title":"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","authors":"G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov","doi":"10.1134/S1061933X24600143","DOIUrl":null,"url":null,"abstract":"<p>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, CuSO<sub>4</sub>, 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: <i>C</i><sub>CH</sub> = 0.0100–0.0150 mg/mL, <span>\\({{C}_{{{\\text{CuS}}{{{\\text{O}}}_{{\\text{4}}}}}}}\\)</span> = 0.4–0.6 mМ, <i>C</i><sub>L-cys</sub> = 3.00 mМ, and <span>\\({{C}_{{{\\text{AgN}}{{{\\text{O}}}_{{\\text{3}}}}}}}\\)</span> = 3.75 mM, when Ag<sup>+</sup>/Cys molar ratio is 1.27. Hydrogels of various CSS–CS and CSS–CS–CuSO<sub>4</sub> 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–CuSO<sub>4</sub> hydrogels, because the pH of CSS is 2.6. Addition of CuSO<sub>4</sub> 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.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Self-Organization and Gelation Processes in a Cysteine–Silver Solution Containing Chitosan and an Electrolyte\",\"authors\":\"G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov\",\"doi\":\"10.1134/S1061933X24600143\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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, CuSO<sub>4</sub>, 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: <i>C</i><sub>CH</sub> = 0.0100–0.0150 mg/mL, <span>\\\\({{C}_{{{\\\\text{CuS}}{{{\\\\text{O}}}_{{\\\\text{4}}}}}}}\\\\)</span> = 0.4–0.6 mМ, <i>C</i><sub>L-cys</sub> = 3.00 mМ, and <span>\\\\({{C}_{{{\\\\text{AgN}}{{{\\\\text{O}}}_{{\\\\text{3}}}}}}}\\\\)</span> = 3.75 mM, when Ag<sup>+</sup>/Cys molar ratio is 1.27. Hydrogels of various CSS–CS and CSS–CS–CuSO<sub>4</sub> 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–CuSO<sub>4</sub> hydrogels, because the pH of CSS is 2.6. Addition of CuSO<sub>4</sub> 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.</p>\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-05-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1061933X24600143\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S1061933X24600143","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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.
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.