由于不溶性是决定性的特点,所以把胆固醇以及与之相关的类固醇、类胡萝卜素(参阅carotene)、前列腺素以及各种各样其它的化合物也归类于类脂化合物。

• "Since insolubility is the defining characteristic, cholesterol and related steroids, carotenoids (see carotene), prostaglandins, and various other compounds are also classifiable as lipids. "