Spectrophotometric Estimation of Nitrazepam in Pure and in Pharmaceutical Preparations

Table 4

Results of determination of NTZ in tablets and statistical comparison with the reference method.

Tablet brand name	Nominal amount mg per tablet	Found** (% of nominal amount ± SD)
		Reference method [17]	Method A	Method B	Method C
Nitravet*	5 mg	101.2±1.3	99.96±0.561	100.41±0.539	100.22±0.71
			𝑡=1.23,	𝑡=0.794,	𝑡=0.935,
			𝐹=5.37	𝐹=5.81	𝐹=3.35

∗Marketed by: *(Anglo French); **Mean value of five determinations.
Tabulated t and F values at 95% confidence level are 2.77 and 6.39, respectively.