Characterization of Streptavidin Binding to Biotinylated, Binary Self-Assembled Thiol Monolayers—Influence of Component Ratio and Solvent
作者:Michael Seifert、Matthias T. Rinke、Hans-Joachim Galla
DOI:10.1021/la904087s
日期:2010.5.4
After 24 h thiol incubation, SA was immobilized on the resulting SAMs using the strong SA-biotin interaction. The SA binding process was monitored by QCM-D (quartz crystal microbalance monitoring dissipation factor). It is shown that the Sauerbrey equation is valid to calculate the mass quantities of the immobilized SA layers. Under the chosen incubation conditions, marginal fractions of the biotinylated
许多生物传感器应用基于链霉亲和素(SA)与部分生物素化的自组装硫醇单分子层(SAMs)的结合。在我们的研究中,从含有16-巯基-1-十六醇(硫醇I)和N的溶液中制备了金的二元SAM。-(8-生物素-3,6-二氧杂-辛酰胺基)-16-巯基十六烷酰胺(硫醇II)的组分比率不同。氯仿或乙醇用作溶剂。硫醇孵育24小时后,利用强的SA-生物素相互作用将SA固定在所得的SAM上。通过QCM-D(石英晶体微量天平监测耗散因数)监测SA结合过程。结果表明,Sauerbrey方程对于计算固定化SA层的质量是有效的。在选定的孵育条件下,氯仿中生物素化的组分II的边缘部分((n I / n II)溶液≈1000)导致SAMs确保最大的SA结合量为m Sauerbrey SA≈400 ng·cm-2,等效于SAM表面的SA单层结构。如果从乙醇溶液中孵育,则在SAM制备过程中,完整的SA层形成需要大量的生物素化成分II((n