Gunning A P, Morris V J
AFRC Institute of Food Research, Norwich Laboratory, UK.
Int J Biol Macromol. 1990 Dec;12(6):338-41. doi: 10.1016/0141-8130(90)90039-d.
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) x 10(5) to (4.5 +/- 0.1) x 10(6) 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.
四甲基铵（TMA）结冷胶不会形成凝胶。光散射研究表明，在四甲基氯化铵（TMACI）中的TMA结冷胶溶液中，结冷胶分子首尾相连组装形成细长的纤维结构。这种纤维被设想为由相邻结冷胶分子末端之间形成双螺旋产生。已观察到分子量范围为(1.06±0.06)×10⁵至(4.5±0.1)×10⁶的纤维。所获得的分子量取决于用于澄清溶液的过滤器的孔径。在凝胶促进阳离子存在下形成强凝胶归因于这些纤维区域的局部有序横向缔合或结晶。有人提出，这种凝胶化模型可能普遍适用于许多多糖体系。
