Precision
Repeatability was assayed by analyzing seven independent formulation samples at the 100% level of concentration of NAG on 1 day (day 1). Intermediate precision was tested analyzing a second series of six independent samples during a different working session on a non-consecutive day to day 1 (day 2). The results of repeatability testing showed that precision, expressed by the RSD%, could be guaranteed within 2% for both series of measurements. Intermediate precision was assessed by computing the RSD% of the complete set of data and it resulted below 2%. In addition, the application of ANOVA F-test on the two series of measurements
demonstrated the absence of systematic errors (Table 2).