The uronic acids are biologically important, being components of many polysaccharides, for example glucuronic acid (from glucose) makes up pectin.

• 例如：葡萄糖醛酸（来自葡萄糖）是树胶和细胞壁的组成成分，半乳糖醛酸（来自半乳糖）是胶质的组成成分。