Figure 14.

Schematics of five channel quartz surfaces (upper) and binding curves for injections of three different antigen solutions ((a)–(c)). Five quartz channels were prepared, where anti human-immunoglobulin-G antibody (AhIgG), anti mouse-IgG antibody (AmIgG), anti rabbit-IgG antibody (ArIgG), staphylococuss aureus protein A (SPA), and bovine serum albumin (BSA) were immobilized. Their fundamental resonance frequencies were between 43 and 55 MHz. 50-nM human IgG (hIgG), mouse IgG (mIgG), and rabbit IgG (rIgG) solutions were injected. In the lower figures, the response of the reference channel (BSA channel) is subtracted. These figures were reproduced with permission from Ogi et al.⁴⁵⁾