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

Table 2

Percentage recovery of ibuprofen BP using plumbagin as an indicator.

Percentage purity
Phenolphthalein	Plumbagin	Percentage recovery
99.50	98.80	99.30
100.00	99.30	99.30
100.00	98.80	98.80
99.50	99.80	100.30
99.00	99.30	100.30
99.50	99.80	100.30
99.00	99.80	100.81
100.00	99.80	99.80
99.50	99.80	100.30
100.00	99.80	99.80
99.00	99.30	100.30
Mean ± SEM = 99.94
Acceptance criteria = 98%–102%

SEM: standard error of mean.