Figure 2

SPR phase signals of sodium chloride solutions with different concentrations.
(a) Representative SPR phase signal curve of different concentrations of sodium chloride solutions. (b) A graph showing a statistical analysis of the SPR phase signal in different concentrations of sodium chloride solutions compared with 0.00%. All the quantitative data are presented as mean ± SD, **P < 0.01. (c) SPR phase signals corresponding to glycerin solutions with different refractive index values known at the wavelength of 671 nm.