occurrence of amino acid

• 氨基酸的存在

occurrence of amino acid的用法和样例：

例句

1. Ion exchange is used extensively for the separation and purification of amino acids.
   摘要离子交换法广泛用于氨基酸的分离纯化。
2. Mixtures of amino acids are analyzed by first separating the mixture into components through ion-exchange chromatography.
   氨基酸的混合物的分析可以首先通过离子交换层析分离为各个组分。