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三、胆固醇的微胶粒溶解胆固醇是不溶于水的,但是在胆汁中胆固醇与胆盐及卵磷脂形成了大分子聚合体,而保持溶解状态。这些微胶粒的分子量为11000～75000。胆盐分子有二种基团,亲水的羟基和羧基面向外,而疏水的类固醇基团埋在聚合体内,有很强的界面活性。正因为这种结构,使胆汁酸分子具有净化(detergent)能力(溶解胆固醇的能力),使那些通常不溶于水的物质增加溶解度。卵磷脂亦是一种兼溶分子,它有一个亲水的磷酰胆碱侧链和一个疏水的脂酸侧链,一般认为卵磷脂是通过扩展微胶粒来支持
Third, cholesterol micelles dissolve cholesterol is not soluble in water, but cholesterol in the bile and bile salts and lecithin formed a macromolecular polymer, and remain dissolved. These micelles have a molecular weight of 11,000 to 75,000. Bile salt molecules have two groups, hydrophilic hydroxyl and carboxyl-oriented outward, and hydrophobic steroid groups buried in the polymer, has a strong interfacial activity. Because of this structure, bile acid molecules have a detergent (the ability to dissolve cholesterol) to increase the solubility of those normally water-insoluble substances. Lecithin is also a soluble molecule, which has a hydrophilic side chain of phosphorylcholine and a hydrophobic side chain of fatty acids, is generally believed that lecithin is supported by the expansion of micelles