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.
在用于实际试样的回收率测定中，结果良好。(2)提出了一种基于酶催化沉积底物和生物素-亲和素两步放大的超灵敏免疫检测方法(第3章)。
An amplified immunoassay with improved sensitivity has been proposed based on two-step amplification procedures of enzyme-catalyzed precipitation and biotin-streptavidin binding system (in Chapter 3).
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