Light scattering studies of tetramethyl ammonium gellan |
| |
Authors: | A. P. Gunning V. J. Morris |
| |
Affiliation: | AFRC Institute of Food Research, Norwich Laboratory, Colney Lane, Norwich NR4 7UA, UK |
| |
Abstract: | Tetramethyl ammonium (TMA) gellan does not gel. Light scattering studies suggest that in solutions of TMA gellan, in tetramethyl ammonium chloride (TMACI), the gellan molecules assemble end to end to produce elongated fibrous structures. Such fibrils are envisaged as resulting from double-helix formation between the ends of neighbouring gellan molecules. Fibrils with molecular weights ranging from (1.06 ± 0.06) × 105 to (4.5 ± 0.1) × 106 have been observed. The molecular weights obtained depended upon the pore size of the filters used to clarify the solutions. The formation of strong gels, in the presence of gel promoting cations, is attributed to a localized ordered lateral association, or crystallization of regions of these fibrils. It is suggested that such a model for gelation may be of general applicability to a number of polysaccharide systems. |
| |
Keywords: | Gellan gelation light scattering |
本文献已被 ScienceDirect 等数据库收录! |
|