Research Article

Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn

Table 4

Effects of the indicator on the interday precision of the method.

HCl/NaOH (mL)CH3COOH/NaOH (mL)Assay of ibuprofen powder (% purity)Assay of ibuprofen BP tablets (% content)
Day 1Day 2Day 3Day 1Day 2Day 3Day 1Day 2Day 3Day 1Day 2Day 3

10.1810.2110.1111.0011.0411.0498.80100.1210096.1496.4298.00
10.1810.2110.1111.0811.2011.0499.3099.6499.5895.9897.2498.58
10.1810.2110.1111.0811.2011.0498.8099.6499.5898.5097.5797.61
10.2710.1110.1111.0811.2011.0499.8099.6499.5898.3097.2698.35
10.0910.1110.2111.0011.2611.0499.30100.1210096.0096.7797.30
10.0910.1110.2110.9011.2010.9399.8099.6410097.1097.1097.11
Mean = 10.17 ± 0.068Mean = 10.16 ± 0.055Mean = 10.14 ± 0.052Mean = 11.02 ± 0.072Mean = 11.02 ± 0.045Mean = 11.02 ± 0.045Mean = 99.30 ± 0.447Mean = 99.80 ± 0.248Mean = 99.79 ± 0.230Mean = 97.00 ± 1.160Mean = 97.06 ± 0.407Mean = 97.83 ± 0.585
RSD = 0.67%RSD = 0.54%RSD = 0.51%RSD = 0.65%RSD = 0.66%RSD = 0.41%RSD = 0.45%RSD = 0.25%RSD = 0.23%RSD = 1.20%RSD = 0.42%RSD = 0.60%