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

Table 6

Results of assay of capsules and statistical evaluation.

Capsule brand name	Found (% of nominal amount ± SD)*
	Reference method	Proposed methods
		Method A	Method B
Gabantin-100	99.32 ± 1.04	98.27 ± 1.97; t = 1.05; F = 3.59	97.01 ± 2.24; t = 2.09; F = 4.64
Gabapin-300	98.07 ± 1.37	99.13 ± 1.88; t = 1.02; F = 1.88	98.96 ± 2.11; t = 0.79; F = 2.37

*Mean value of five determinations.
Tabulated t-value at the 95% confidence level is 2.78.
Tabulated F-value at the 95% confidence level is 6.39.