Determination of Carvedilol and its Impurities in Pharmaceuticals

New ecological first derivative synchronous spectrofluorimetric method for simultaneous quantification of carvedilol and ivabradine in tablets

A new, rapid, selective, green, and highly sensitive method has been established to determine ivabradine and carvedilol simultaneously. The first derivative synchronous spectrofluorimetric approach was applied for the determination of the studied drugs. Assessment of the first derivative amplitude of carvedilol and ivabradine has been done at 339 nm and 298 nm respectively which are the zero crossing points of each other. The method validation is estimated and was found to be consistent with International Conference on Harmonization guidelines. Linearity was found to be in the range of 10.0 to 90.0 ng/mL for carvedilol and from 80.0 to140.0 ng/mL for ivabradine. The detection limits were found to be 1.2 ng/ mL and 3.3 ng/mL and the quantitation limits were 3.7 ng / mL and 10.0 ng /mL for carvedilol and ivabradine, respectively. The method was effectively applied for the determination of both drugs in their synthetic mixture in different ratios and in their prepared co-formulated tablets. The results were compared with those of comparison HPLC methods. Ethanol was used as a green solvent. The proposed method is suitable for the determination of ivabradine and carvedilol with satisfactory accuracy and precision. The greenness of the method was evaluated using four assessment tools, i.e. NEMI, GAPI, Eco-scale, and AGREE. The proposed method is simple with a low cost compared to HPLC methods.

Hollow fiber based liquid phase microextraction with high performance liquid chromatography for the determination of trace carvedilol (β-blocker) in biological fluids

A hollow-fiber liquid-phase microextraction (HF-LPME), followed by high-performance liquid chromatography–ultraviolet (HPLC–UV) method for the trace determination of carvedilol (β-blocker) in biological fluids, has been described. The separation was achieved using Inertsil ODS-3 C18 (250 mm × 4.6 mm, 3 μm) column with a mobile phase composition of 10 mM phosphate buffer (pH 4.0)–acetonitrile (50:50, v/v) at a flow rate of 1.0 mL/min, under isocratic elution. Several parameters (i.e., type of organic solvent, donor phase pH, concentration of acceptor phase (AP), stirring rate, extraction time, and salt addition) that affect the extraction efficiency were investigated. The optimum HF-LPME conditions were as follows: dihexyl ether as an organic solvent; donor phase pH, 10.7; 0.1 M HCl (AP); 1100-rpm stirring rate; 60-min extraction time; and no salt addition. These parameters have been confirmed using design of experiments. Under these conditions, an enrichment factor of 273-fold was achieved. Good linearity and correlation coefficient were obtained over the range 5–1000 ng/mL (r2 = 0.9994). Limits of detection and quantitation were 1.2 and 3.7 ng/mL, respectively. The relative standard deviation at 3 different concentration levels (5, 500, and 1000 ng/mL) were less than 13.2%. Recoveries for spiked urine and plasma were in the range 80.7–114%. The proposed method is simple, sensitive, and suitable for the determination of carvedilol in biological fluids.

Chemometric-assisted spectrophotometric methods and high performance liquid chromatography for simultaneous determination of seven β-blockers in their pharmaceutical products: a comparative study

Chemometric-assisted spectrophotometric methods and high performance liquid chromatography (HPLC) were developed for the simultaneous determination of the seven most commonly prescribed β-blockers (atenolol, sotalol, metoprolol, bisoprolol, propranolol, carvedilol and nebivolol). Principal component regression PCR, partial least square PLS and PLS with previous wavelength selection by genetic algorithm (GA-PLS) were used for chemometric analysis of spectral data of these drugs. The compositions of the mixtures used in the calibration set were varied to cover the linearity ranges 0.7-10 μg ml(-1) for AT, 1-15 μg ml(-1) for ST, 1-15 μg ml(-1) for MT, 0.3-5 μg ml(-1) for BS, 0.1-3 μg ml(-1) for PR, 0.1-3 μg ml(-1) for CV and 0.7-5 μg ml(-1) for NB. The analytical performances of these chemometric methods were characterized by relative prediction errors and were compared with each other. GA-PLS showed superiority over the other applied multivariate methods due to the wavelength selection. A new gradient HPLC method had been developed using statistical experimental design. Optimum conditions of separation were determined with the aid of central composite design. The developed HPLC method was found to be linear in the range of 0.2-20 μg ml(-1) for AT, 0.2-20 μg ml(-1) for ST, 0.1-15 μg ml(-1) for MT, 0.1-15 μg ml(-1) for BS, 0.1-13 μg ml(-1) for PR, 0.1-13 μg ml(-1) for CV and 0.4-20 μg ml(-1) for NB. No significant difference between the results of the proposed GA-PLS and HPLC methods with respect to accuracy and precision. The proposed analytical methods did not show any interference of the excipients when applied to pharmaceutical products.

Carvedilol

Carvedilol ((2RS)-1-(9H-carbazol-4-yloxy)-3-[[2-(2-methoxyphenoxy)ethyl]amino]propan-2-ol), a β1-, β2-, and α1-adrenoreceptor blocker drug with antioxidant and antiproliferative effects, is indicated for treatment of hypertension, stable angina pectoris, and congestive heart failure. A profile of this drug substance is provided in this chapter and includes physical characteristics of Carvedilol (e.g., UV-vis, IR, NMR, and mass spectra). Details regarding the stability of Carvedilol in the solid state and solution phase are presented and methods of analysis (compendial and literature) are summarized. Furthermore, an account of the pharmacokinetics (ADME) and synthesis of Carvedilol are presented.