Comparative analysis of the behavior of gellan gum (S-60) and welan gum (S-130) in dilute aqueous solution |
| |
| Institution: | 1. Collaborative Innovation Center of Seafood Deep Processing, National Engineering Research Center of Seafood, National & Local Joint Engineering Laboratory for Marine Bioactive Polysaccharide Development and Application, School of Food Science and Technology, Dalian Polytechnic University, Dalian, 116034, China;2. College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China;3. Department of Dairy and Food Science, South Dakota State University, Brookings, SD 57007, USA;4. Medical Technology College, Nalut University, Nalut 00218, Libya;5. Department of Chemistry Center for Fluorinated Functional Materials, University of South Dakota, Vermillion, SD, 57069, USA;1. State Key Laboratory of Heavy Oil Processing and Centre for Bioengineering and Biotechnology, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong, People''s Republic of China;2. Engineering Research Center of Industrial Biocatalysis, Fujian Province Universities, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, Fujian, People''s Republic of China;3. College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, People''s Republic of China |
| |
| Abstract: | Optical rotation, circular dichroism, and microcalorimetric data clearly and consistently show that gellan gum, S-60 (Me4N+ form), undergoes in water at 25° a rather sharp conformational transition upon increasing the concentration of added Me4NCl. Similar data show that S-60 behaves anomalously upon addition of Ca2+ ions with, eventually, formation of aggregates and/or gels. The Me4NCl-induced conformational change of S-60 is thermally reversible with no hysteresis. In contrast, with welan gum, S-130 (Me4N+ form), no evidence could be found for a dependence of chain conformation of the main external variables considered. Comparison of the circular-dichroism spectra of the two polysaccharides suggests that S-130 in water might be present in a stiff conformation similar to that assumed by S-60 in aqueous Me4NCl. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
