Simple Methods for the Spectrophotometric Determination of Carvedilol

Table 1

Comparison table for reported methods and proposed methods.

Reagents	Range (𝜇g mL^−1)	𝜆max (nm)	Molar absorptivity (Lmol^−1 cm^−1)	Reference
Methanol	4.00–36.00	285	1.54 × 10^4	[12]
Bromocresol green	5.00–25.00	415	1.8 × 10^4	[14]
Ninhydrin	0.20–1.20	402	2.571 × 10^4	[15]
Acetaldehyde + SNP	0.60–2.00	558	1.617 × 10^4	[15]
Proposed methods
𝑝-Chloranil	20.00–100.00	662	0.257 × 10^4	—
PDAB	50.00–250.00	601	0.92 × 10^3	—

SNP: sodium nitroprusside; PDAB: 𝑝-dimethylaminobenzaldehyde.