Table 2. Limits of Detection for Spike Protein Binding to Biotinylated 1C,5′ Aptamer Immobilized on a BLI Tip, and the Concentrations at which This Limit Is Reached According to the Fitted Hill Model for Spike Protein Binding Response as a Function of Concentration.

percentile	LOD (nm)	[spike] (nM)
99	0.09	236
99.9	0.10	250
99.99	0.12	260