Use of Charge Transfer Complexation Reactions for the Spectrophotometric Determination of Sumatriptan in Pharmaceuticals

Table 3

Evaluation of intraday and interday precision and accuracy.

Method	SMT taken (𝜇g mL^−1)	Intra-day (𝑛=7)			Inter-day (𝑛=5)
		SMT found^a (𝜇g mL^−1)	%RSD^b	%RE^c	SMT found^a (𝜇g mL^−1)	%RSD^b	%RE^c
DDQ method	16.0	16.4	0.90	2.27	16.4	1.20	2.63
	32.0	32.4	0.93	1.29	32.5	1.25	1.63
	48.0	47.6	1.79	0.83	47.4	1.93	1.16
I2 method	8.00	7.91	1.71	1.09	7.90	1.91	1.22
	16.0	16.3	0.82	1.98	16.3	1.06	2.16
	24.0	24.2	1.72	0.93	24.3	2.01	1.07

^aMean value of five determinations; ^brelative standard deviation (%); ^crelative error (%).