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.
采用链霉亲和素包被磁纳米粒子，将生物素标记的特异性抗体偶联在磁纳米粒子上，制备出高特异性的磁纳米探针；
The magnetic nanoparticle probe was prepared by specifically connecting the streptavidin-conjugated magnetic nanoparticles and the antibody of analyte via the strong streptavidin-biotin interaction.
采用链霉亲和素包被磁纳米粒子，将生物素标记的特异性抗体偶联在磁纳米粒子上，制备出高特异性的磁纳米探针；
The magnetic nanoparticle probe was prepared by specifically connecting the streptavidin-conjugated magnetic nanoparticles and the antibody of analyte via the strong streptavidin-biotin interaction.
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