Sensitive and Selective Spectrophotometric Determination of Gabapentin in Capsules Using Two Nitrophenols as Chromogenic Agents

Table 4

Precision and accuracy.

Method	GBP taken (μg mL^−1)	Intraday (𝑛=7)			Interday (𝑛=5)
		GBP found^a (μg mL^−1)	%RSD^b	%RE^c	GBP found^a (μg mL^−1)	%RSD^b	%RE^c
Method A	5.00; 7.50; 10.00	5.13; 7.66; 10.28	1.54; 1.03; 1.72	2.60; 2.13; 2.80	5.16; 7.72; 10.36	1.42; 1.65; 2.11	3.20; 2.93; 3.60
Method B	8.00; 12.00; 16.00	8.18; 12.23; 15.82	1.46; 2.34; 1.98	2.25; 1.92; −1.12	8.23; 12.28; 15.76	1.77; 2.59; 2.45	2.88; 2.33; −1.50

^aMean value of 𝑛 determinations.
^bRelative standard deviation (%).
^cBias (%): [(found − taken)/taken] × 100.