结冷胶-羧甲基纤维素复配胶性能的研究

Properties of Gellan-Carboxyl Methyl Cellulose Mixed Gels

利用全质构分析、离心分离和分光光度法研究了结冷胶-羧甲基纤维素(carboxyl methyl cellulose,CMC)的配比、离子种类和离子浓度对结冷胶-CMC复配胶质构、持水力以及透明度的影响。结果表明:复配胶硬度随结冷胶比例降低而降低;在离子浓度达到临界水平前随离子浓度增加而增加,临界水平之后随离子浓度增加而降低;添加钙离子比钠离子更容易得到高硬度的凝胶。总的来说,添加离子会降低凝胶的弹性和内聚性;适当的结冷胶和CMC比例可提高凝胶弹性和内聚性。降低结冷胶-CMC复配比例可提高复配胶的透明度。

The effects of ratio of gellan to carboxyl methyl cellulose(CMC),ion type,and ion concentration on the textural properties,water-holding capacity(WHC),and clarity of gellan-CMC mixed gels were examined using instrumental texture profile analysis(TPA),centrifugation and spectrophotometry.Hardness of the mixed gels decreased as the proportion of gellan decreased,and increased with increasing calcium or sodium ions until ion concentration reached a critical level.Thereafter,further increases in calcium or sodium resulted in a reduction of hardness.Gel hardness was achieved at a much higher level with sodium ionthan with calcium ion.In general,the addition of ions caused gels to be less cohesive and springy.Decreasing gellan to CMC ratio caused an increase in gel clarity.The results of this study suggested a weak positive interaction between gellan and CMC when no ion was added,whereas gellan formed a continuous network and CMC discontinuous phase at higher ion levels.