Table 2. Relative Changes in Capacitance Values of Different Membrane Compositions after Quinacrine Titration Derived from a Nonlinear Least Squares Fit to the EIS Data.

	ΔQ (μF sm–1)
quinacrine (μM)	DOPC	DOPC:Chol	DOPC:SM:Chol
0	0.0	0.0	0.0
1	0.04 ± 0.01	–0.025 ± 0.01	0.215 ± 0.01
5	0.07 ± 0.02	–0.016 ± 0.02	0.267 ± 0.07
10	–0.05 ± 0.03	–0.023 ± 0.01	0.272 ± 0.05
20	–0.06 ± 0.04	–0.047 ± 0.01	0.328 ± 0.51
buffer exchange	0.13 ± 0.03	0.144 ± 0.018	0.693 ± 0.14