Table 1.

Resonance angles in the functionalisation steps and AQP4-Ab detection.

Steps	Reference channel			Detection channel
	Initial	Final	Δ θ	Initial	Final	Δ θ
Au-Cys	0°	0°	—	0°	0°	—
Au-Cys-PEG	0°	0.09°	0.09°	0°	0.09°	0.09°
Au-Cys-PEG-Pep	0.09°	0.52°	0.43°	0.09°	0.60°	0.51°
Detection of AQP4-Ab	0.52°	0.53°	0.01°	0.60°	0.86°	0.26°