Table 2.

The selectivity and relative selectivity coefficients for competitive molecules for surface plasmon resonance (SPR) sensors.

	MIP Sensor		NIP Sensor
	∆R	k	∆R	k	k’
l-Phe	2.11	−	0.59	−	−
d-Phe	0.91	2.31	0.53	1.11	2.08
l-Try	0.78	2.71	0.51	1.16	2.34
l-Phe+d-Phe	1.66	1.27	0.52	1.13	1.11
l-Phe+l-Try	1.55	0.59	0.51	1.04	0.56
l-Phe+d-Phe+l-Try	1.73	0.45	0.52	0.98	0.46

Resonance frequency change: ∆R, Molecularly imprinted polymer: MIP, Non-imprinted polymer: NIP, Selectivity coefficients: k, Relative selectivity coefficients: k’, l-phenylalanine: l-Phe, d-Phenylalanine: d-Phe, l-tryptophan: l-Try.