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. Author manuscript; available in PMC: 2014 Jun 7.
Published in final edited form as: Analyst. 2013 Jun 7;138(11):3189–3195. doi: 10.1039/c3an00328k

Figure 8.

Figure 8

CTxB-A555 binding curves measured by tracking shifts in the WGM resonance with CTxB-A555 concentration. For resonators coated with DOPC bilayers incorporating GM1 (red squares) the binding curve shows a saturation response with a detection limit of 3.3 pM. This is compared with control studies using spheres coated with pure DOPC bilayers (blue triangles), which show negligible shifts with CTxB-A555 addition. The inset shows a log plot of the data from which a Kd of 1.5 × 10−11 is calculated, which is consistent with literature values.