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Such improvement was dominated by the number of oxygen atoms. These indicated that linker S-4 (2-(2-(2-(2-chloroethoxy) ethoxy) ethoxy) acetic acid) was optimal to eliminate the unwanted non-specific interactions. In comparison with the columns prepared by linker S-1 (6-chlorocaproic acid) and histidine tagged β2-AR, the drugs on the linker S-4 column gave greater dissociation rate constants (e.g. 60.3±0.3 s-1 for salbutamol), which is closer to the data in literatures. Taking together, we concluded that optimization of the linker struc