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Table 4 Recovery studies with pregabalin capsules by standard addition method

From: A novel method for spectrophotometric determination of pregabalin in pure form and in capsules

Initial Conc. (mg/mL) Volume (mL) Amount of PGB added (μg) Amount recovered (μg) Recovery (%) ± SDa Er% RSD (%)
0.05 5.0 50.0 49.5 98.85 ± 0.145 -1.14 0.14
0.05 5.0 100.0 99.5 99.09 ± 0.370 -0.91 0.37
0.05 5.0 200.0 199.1 99.45 ± 0.124 -0.550 0.13
0.1 5.0 50.0 49.1 98.71 ± 0.471 -1.29 0.47
0.1 5.0 100.0 98.1 98.16 ± 0.271 -1.83 0.28
0.1 5.0 200.0 98.1 98.16 ± 0.271 -1.83 0.28
0.2 5.0 50.0 49.0 98.44 ± 0.426 -1.55 0.43
0.2 5.0 100.0 99.7 99.67 ± 0.186 -0.32 0.19
0.2 5.0 200.0 199.0 99.49 ± 0.165 -0.510 0.17
0.4 5.0 50.0 49.7 99.27 ± 0.251 -0.73 0.25
0.4 5.0 100.0 97.6 97.54 ± 0.196 -2.45 0.20
0.4 5.0 200.0 199.7 99.74 ± 0.123 -0.253 0.12
0.6 5.0 50.0 49.8 99.07 ± 0.483 -0.92 0.48
0.6 5.0 100.0 98.2 98.29 ± 0.134 -1.70 0.14
0.6 5.0 200.0 198.9 98.71 ± 0.646 -1.287 0.65
0.8 5.0 50.0 49.1 98.62 ± 0.479 -1.38 0.48
0.8 5.0 100.0 99.2 99.25 ± 0.098 -0.74 0.10
0.8 5.0 200.0 198.2 99.22 ± 0.136 -0.777 0.14
1.0 5.0 50.0 50.0 99.49 ± 0.495 -0.51 0.49
1.0 5.0 100.0 97.0 97.09 ± 0.147 -2.91 0.15
1.0 5.0 200.0 199.5 99.66 ± 0.198 -0.333 0.20
  1. a Average of determinations carried out in triplicate.