Table 2. Results Obtained for Each Compound Using Conventional FT-IR Spectroscopy and QCL-IR Spectroscopy.

IR (path-length)	compound	peak (cm–1)	R2	ANOVA (mM)	LOD (mM)	LOQ (mM)
FT-IR (50 μm)	glucose	1036	0.995	1.5	0.9	2.8
QCL-IR (76 μm)	glucose	1036	0.997	0.2	0.5	1.7
	lactate	1124	0.999	0.2	0.2	0.7
	pyruvate	1176	0.998	0.2	0.1	0.3