Recommended conditions 101.02 NQS concentration (%, w/v) 0.28 103.48 NQS concentration (%, w/v) 0.32 99.90 Buffer solution (pH) 12.8 101.78 Buffer solution (pH) 13.2 105.33 Reaction time (min) 8 99.21 Reaction time (min) 12 100.59

Table 3: Influence of small variation in the assay condition on the analytical performance of the proposed spectrophotometric method for determination of finasteride using NQS reagent.

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