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

Table 1

Comparison of results obtained using standard indicators and plumbagin.

HCl/NaOH (mL)		CH3COOH/NaOH (mL)		Assay of ibuprofen powder (% purity)		Assay of ibuprofen BP tablets (% content)
Methyl orange	Plumbagin	Phenolphthalein	Plumbagin	Phenolphthalein	Plumbagin	Phenolphthalein	Plumbagin
10.27	10.18	11.10	11.00	99.50	98.80	97.45	97.30
10.18	10.18	11.10	11.08	100 00	99.30	95.30	96.78
10.18	10.18	11.10	11.08	100 00	98.80	95.00	95.53
10.18	10.27	11.08	11.08	99.50	99.80	97.50	97.10
10.27	10.09	11.08	11.00	99 00	99.30	99.02	96.82
9.99	10.09	10.90	10.90	99.5 0	99.80	96.30	97.25
Mean = 10.18 ± 0.102	Mean = 10.17 ± 0.068	Mean = 11.06 ± 0.079	Mean = 11.02 ± 0.072	Mean = 99.58 ± 0.376	Mean = 99.30 ± 0.447	Mean = 96.76 ± 1.521	Mean = 96.80 ± 0.657
RSD = 1.00%	RSD = 0.67%	RSD = 0.71%	RSD = 0.65%	RSD = 0.38%	RSD = 0.45%	RSD = 1.57%	RSD = 0.68%