Table 4.

Intra-day assay precision and accuracy of the HPLC method for the determination of NAG^*

Nominal concentration (µg/ml)	Calculated concentration (µg/ml)	Precision RSD (%)	Accuracy error
1	1.02	11.27	2.17
2	2.01	9.55	0.67
4	4.005	7.35	0.07
6	5.96	5.76	0.70
8	7.92	5.82	0.96
10	10.08	6.88	0.80

^*Samples were analyzed in five replicates for each concentration per day.