中文摘要：

以胶态树脂酸R、脂肪酸0和甘油三酯TG为模型，研究了在钙离子存在条件下，中性聚糖和酸性聚糖对胶态易沉积物质的稳定性的影响。结果发现，单纯的胶态模型物可以依靠静电作用而稳定存在，但加入钙离子后迅速失去稳定性，树脂酸R、脂肪酸0、甘油酯TG分别在[Ca^2＋]／[X]（X分别指R、O、TG）为0．6、1．6、0．5左右时几乎完全失稳而聚集。中性聚糖与树脂酸R和脂肪酸O二者的浓度比分别超过0．2和1．0时，钙离子的加入不会影响模型物的稳定性，但对甘油三酯TG稳定作用限制在30％左右。酸性聚糖的加入会降低模型物的稳定性。两种聚糖共存时，对树脂酸和脂肪酸而言，酸性聚糖的负面作用是有限的，体系会保持一定的稳定性，但胶态甘油三酯体系会完全失去稳定性。

英文摘要：

The effect of neutral and acidic polysaccharides on the stability of colloidal potentially depositable substances （resin acid R, fatty acid O and Triglyceride TG） in the presence of calcium ions was investigated. The results show that the colloidal models could stabilize themselves by electrostatic mechanism if no calcium ions were added. Once the calcium ions were added, the colloidal particles would aggregate rapidly. When the concentration ratio of calcium ions to R, O and TG reached 0.6, 1.6, 0.3, respectively, the colloidal particles would completely aggregate. However, once the concentration ratio of neutral polysaccharide to R and O exceeded 0.2 and 1.0, no calcium-induced aggregation would occur. But for TG, the steric stabilization of neutral polysaccharide felt into the shade, with only 30% of TG being stabilized. Acidic polysaccharide could weaken the stability of colloidal models. When the neutral and acidic coexisted, the sterically stabilized resin acid R and fatty acid O would retain a certain level of stability, which indicated the limited adverse effect of acidic polysaccharide. The acidic polysaccharide would further devastate the scanty neutral polysaccharide-induced stability of TG, till they completely aggregate.