Gelation of Na-alginate aqueous solution: A study of sodium ion dynamics via NMR relaxometry
文献类型：期刊论文
| 作者 | Zhao, Congxian1,2; Zhang, Chao2; Kang, Hongliang2; Xia, Yanzhi1; Sui, Kunyan1; Liu, Ruigang2 |
| 刊名 | CARBOHYDRATE POLYMERS
 |
| 出版日期 | 2017-08-01 |
| 卷号 | 169页码:206-212 |
| 关键词 | Sodium Alginate Gelation Nmr Relaxometry Dynamics |
| 英文摘要 | Sodium alginate (SA) hydrogels have a wide range of applications including tissue engineering, drug delivery and formulations for preventing gastric reflux. The dynamics of sodium ions during the gelation process of SA solution is critical for clarification of the gelation procedure. In this work, nuclear magnetic resonance (NMR) relaxometry and pulsed-field-gradient (PFG) NMR diffusometry were used to investigate the dynamics of the sodium ions during the gelation of SA alginate. We find that sodium ions are in two different states with the addition of divalent calcium ions, corresponding to Ca2+ crosslinked and un-crosslinked regions in the hydrogels. The sodium ions within the un-crosslinked regions are those released from the alginate chains without Ca2+ crosslinking. The relative content of sodium ions within the Ca2+ crosslinked regions decreased with the increase in the content of calcium ions in the system. The relaxation time T-2 of sodium ions within the Ca2+ crosslinked and un-crosslinked regions shift to shorter and longer relaxation time with the increase in concentration of calcium ion, which indicates the closer package of SA chains and the larger space for the diffusion of free sodium ions. This work clarifies the dynamics of Na-23(+) in a calcium alginate gel at the equilibrium state. (C) 2017 Elsevier Ltd. All rights reserved. |
| 语种 | 英语 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/38502]  |
| 专题 | 化学研究所_高分子物理与化学实验室 |
| 作者单位 | 1.Qingdao Univ, Collaborat Innovat Ctr Marine Biomass Fibers Mat, Sch Mat Sci & Engn, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Sate Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Congxian,Zhang, Chao,Kang, Hongliang,et al. Gelation of Na-alginate aqueous solution: A study of sodium ion dynamics via NMR relaxometry[J]. CARBOHYDRATE POLYMERS,2017,169:206-212. |
| APA | Zhao, Congxian,Zhang, Chao,Kang, Hongliang,Xia, Yanzhi,Sui, Kunyan,&Liu, Ruigang.(2017).Gelation of Na-alginate aqueous solution: A study of sodium ion dynamics via NMR relaxometry.CARBOHYDRATE POLYMERS,169,206-212. |
| MLA | Zhao, Congxian,et al."Gelation of Na-alginate aqueous solution: A study of sodium ion dynamics via NMR relaxometry".CARBOHYDRATE POLYMERS 169(2017):206-212. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。