Chitin is the most natural macromolecular compound in the world,except for the celluse.It exists in all kinds of the marine arthropod,such as shrimp and crab.

• 除纤维素外,甲壳素是自然界中蕴藏量最大的天然高分子化合物之一,广泛存在于海洋节肢动物、藻类细胞膜和高等植物细胞壁中,分布极其广泛。