因为它的强高亲和力非共价结合，链霉素亲和素可以用于检测和分离生物素化的蛋白（1.2）。
Because of its strong non-covalent interaction with biotin, streptavidin can be used to isolate biotinylated proteins (1,2).
链霉素亲和素是从链霉亲生物素蛋白中分离出来的53，000道尔顿的同源四聚体（3），每一个链霉素亲和素的亚基可以与维生素形成高亲和力非共价结合。
Streptavidin is a 53,000 dalton tetrameric protein purified from the bacterium Streptomyces avidinii (3). Each subunit binds to biotin with extremely high affinity.
由于化学合成方法存在着工艺复杂、成本高、易污染等缺点，因此科学家试图利用微生物来大量合成生物素。
Some scientists are trying to produce more biotin by microorganism due to some drawbacks of chemical synthesis methods such as complex interaction, high-cost, continual pollution.
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