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

Figure 4

Effect of solvents on the color development: (1) corresponding blank-method A; (2) sample versus corresponding blank (7.5 μg mL⁻¹ GBP)-method A; (3) corresponding blank-method B; (4) sample versus reagent blank (7.5 μg mL⁻¹ GBP)-method B.

(a)

(b)