X-ray diffraction patterns from oriented samples of iota- and kappa-carrageenans and implications for conformational transition
文献类型：期刊论文
| 作者 | Lee, I |
| 刊名 | POLYMER-KOREA
 |
| 出版日期 | 1997-07-01 |
| 卷号 | 21期号:4页码:539-548 |
| 关键词 | X-ray Diffraction Double-helix Conformational Transition Diffusion Techniques Relative Hydration Gelation |
| ISSN号 | 0379-153X |
| 英文摘要 | New additional X-ray diffraction layers were observed from KI induced iota-carrageenan, being interpreted: 1) as a screw displacement from exact half-staggered double-helix. 2) as a difference between the two chains resulting conformational perturbation. As NaI wt. ratio in iota-carrageenan solution increases, the 1(st) and the 5(st) layer line get stronger, but the 6th layer line becomes weaker. According to X-ray diffraction observation, Cl- or Br- ions with a counterpart metallic cation in aqueous solution give almost the same result as I- ions. It seems that the structural changes depend on the relative difference of hydration energy between counteranions and countercations in solution. Upon the addition of NaI and KI in fiber state reversible change was detected by X-ray diffraction with performing diffusion-in and -out techniques. Reversible conformation change supports a double-helix model for iota-carrageenans. Therefore, the structural changes of iota-carrageenan implicate to conformational transition from a flexible molecule to a stiff molecule showing no topological constraint and gelation can be considered in helical level by side-by-side stacking. |
| 语种 | 英语 |
| WOS记录号 | WOS:A1997XR13600003 |
| 出版者 | POLYMER SOC KOREA |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/44897]  |
| 专题 | 中国科学院化学研究所 |
| 作者单位 | CHINESE ACAD SCI,INST CHEM,BEIJING 100080,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | Lee, I. X-ray diffraction patterns from oriented samples of iota- and kappa-carrageenans and implications for conformational transition[J]. POLYMER-KOREA,1997,21(4):539-548. |
| APA | Lee, I.(1997).X-ray diffraction patterns from oriented samples of iota- and kappa-carrageenans and implications for conformational transition.POLYMER-KOREA,21(4),539-548. |
| MLA | Lee, I."X-ray diffraction patterns from oriented samples of iota- and kappa-carrageenans and implications for conformational transition".POLYMER-KOREA 21.4(1997):539-548. |
入库方式： OAI收割
来源：化学研究所
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