A New HPLC-ELSD Method for Simultaneous Determination of N-Acetylglucosamine and N-Acetylgalactosamine in Dairy Foods

Table 5

Recovery and endogenous concentration data of GlcNAc and GalNAc from four different dairy foods ( independent replicates).

Matrix	GlcNAc				GalNAc
	EC	FC	Recovery (%)	RSD	EC	FC	Recovery (%)	RSD
Raw milk	152.3 ± 3.4	30.0	102.06	1.94	189.3 ± 12.1	12.5	100.50	2.46
		60.0	101.41	1.18		25.0	99.92	1.37
		120.0	95.12	0.59		50.0	103.30	2.08
UHT milk	150.2 ± 5.4	30.0	102.39	3.21	115.0 ± 1.1	12.5	103.34	1.81
		60.0	97.02	0.42		25.0	105.88	0.84
		120.0	101.06	2.99		50.0	102.70	0.57
Yoghurt	151.2 ± 11.1	30.0	101.20	0.66	157.0 ± 5.5	12.5	99.39	0.91
		60.0	100.20	0.79		25.0	100.58	0.92
		120.0	100.81	1.03		50.0	99.79	0.62
Infant formula	720.0 ± 1.6	30.0	105.45	0.68	1118.4 ± 12.3	12.5	100.56	1.38
		60.0	103.95	2.90		25.0	102.17	0.81
		120.0	103.26	1.25		50.0	99.51	1.10

EC = endogenous concentration (mg/L, mg/kg).
FC = fortified concentration (mg/mL).
RSD = relative standard deviation.