Journal of Pharmacy And Bioallied Sciences

SHORT COMMUNICATION
Year
: 2010  |  Volume : 2  |  Issue : 4  |  Page : 372--375

Spectrophotometric method for simultaneous estimation of atenolol in combination with losartan potassium and hydrochlorothiazide in bulk and tablet formulation


Sanjay Bari, Shital Sathe, Pritam Jain, Sanjay Surana 
 Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Dhule (M.S.) - 425 405, India

Correspondence Address:
Sanjay Bari
Department of Pharmaceutical Chemistry, R. C. Patel Institute of Pharmaceutical Education and Research, Shirpur, Dhule (M.S.) - 425 405
India

Abstract

Aim : To develop a simple, accurate, rapid and precise UV spectrophotometric method for the estimation of atenolol in combination with losartan potassium and hydrochlorothiazide. Materials and Methods : The method employs formation and solving simultaneous equation using 251.60 nm and 224.20 nm for losartan potassium and atenolol, 224.20 and 271.60 for atenolol and hydrochlorothiazide as two analytical wavelengths, using methanol water as a solvent. Results and Conclusion : The linearity was observed in the concentration range of 5-30 μg/ml (r=0.9991) for losratan pottassium, 2 - 12 μg/ml (r = 0.9995) for atenolol and 2 - 14 μg/ml (r = 0.9993) for hydrochlorothiazide. The results of the method were validated statistically and by recovery studies.



How to cite this article:
Bari S, Sathe S, Jain P, Surana S. Spectrophotometric method for simultaneous estimation of atenolol in combination with losartan potassium and hydrochlorothiazide in bulk and tablet formulation.J Pharm Bioall Sci 2010;2:372-375


How to cite this URL:
Bari S, Sathe S, Jain P, Surana S. Spectrophotometric method for simultaneous estimation of atenolol in combination with losartan potassium and hydrochlorothiazide in bulk and tablet formulation. J Pharm Bioall Sci [serial online] 2010 [cited 2022 Jun 24 ];2:372-375
Available from: https://www.jpbsonline.org/text.asp?2010/2/4/372/72144


Full Text

Losartan potassium (LOK) is an angiotensin II receptor antagonist and chemically it is 2-n-butyl-4-chloro-5-hydroxymethyl-1-[2'-(1H-tetrazol-5-yl)(biphenyl-4-yl)methyl]imidazole,a strong antihypertensive agent. [1] Atenolol (ATL) is a cardioselective β-blocker and chemically it is (RS)-4-(2 hydroxy-3-isopropylaminopropoxy)-phenylacetamide. [2],[3] Hydrochlorothiazide (HCTZ) is chemically 6-chloro-3, 4-dihydro-2H-1, 2, 4-benzothiadiazine-7-sulfonamide1, 1-dioxide. Literature survey revealed that visible spectrophotometric, [4],[5] HPLC [6] and some spectrophotometric, [7],[8] HPLC [9] methods are available for the estimation of LOK and ATL from pharmaceutical formulations respectively. Also, different methods are available for the estimation of HCTZ. [10],[11],[12],[13] So it was thought to develop an analytical method for the determination of all three drugs in their combined dosage form.

In the present investigation, an attempt has been made to develop a simple and economical spectrophotometric method with greater precision, accuracy and sensitivity for the analysis of atenolol, losartan potassium and hydrochlorothiazide in bulk and dosage forms.

Experimental

Instrumentation

The present work was carried out on Schimadzu UV-2450 series spectrophotometer having double beam detector configuration. The absorption spectra of reference and test solutions were carried out in 1 cm quartz cell over the range of 200 - 400 nm.

Solvents

Methanol (AR Grade, S.D. Fine chemicals, Mumbai, India) and distilled water.

Procedure: Employing simultaneous equations (Shimadzu 2450)

Standard stock solutions of LOK, ATL and HCTZ were prepared separately by dissolving 10 mg of each drug in 20 ml methanol and diluted to 100 ml with distilled water. From the overlain spectra (shown in [Figure 1]) of LOK (20μg/ ml) and ATL (20 μg/ml), two wavelengths 251.60 nm of LOK and 224.20 nm of ATL were selected. The overlain spectra (shown in [Figure 2]) for ATL (8μg/ ml) and HCTZ (2μg/ ml), two wavelength 224.20 nm and 271.60 nm, were selected respectively. The linearity was found to be in the range of 5 - 35 μg/ml, 2 - 12 μg/ml and 2-14μg/ ml for LOK, ATL and HCTZ, respectively. The optical characteristics and statistical data of regression equation are shown in [Table 1].{Table 1}{Figure 1}{Figure 2}

The method is based on simultaneous equation [11] and utilizes corresponding absorbance maximas, i.e. 251.60 nm of LOK, 224.20 nm of ATL and 271.60 nm for quantification. The mean absorptivity coefficients of both drugs at each wavelength were determined from different dilutions (six independent determinations) of corresponding drugs within Beer's law concentration range limit. Using these, a set of two simultaneous equations were framed for two combinations:

Simultaneous equation for LOK and ATL

A 251.60 = 320.25 C LOK + 8.1 C ATL ………………… (1)

A 224.20 = 661.75 C LOK + 384.50 C ATL ………….. (2)

where, C LOK and C ATL are the concentrations in g /100ml in sample solution.

By rearranging equations 1 and 2, concentration C LOK and C ATL can be obtained as,

C LOK = A2 × 8.1 - A1 × 380.50 / -116494.95 ………….. (3)

C ATL = A1 × 661.75 - A2 × 320.25 / -116494.95 ………....... (4)

Simultaneous equation for ATL and HCTZ

A 224.20 = 866.75 C LOK + 1288 C ATL …………………. (5)

A 271.60 = 106.0 CLOK + 720 C ATL ………….. (6)

where C ATL and C HCZT are the concentrations in g /100 ml in sample solution.

By rearranging equations 1 and 2, concentration C LOK and C ATL can be obtained as,

C ATL = A2 × 1288 - A1 × 720 / - 487532 ………….. (7)

C HCZT = A1 ×106.0 - A2 × 866.75 / - 487532 ………....... (8)

Preparation and analysis of tablet formulations

Commercial tablets procured from local market were used for analysis. Twenty tablets (Revas AT) were weighed and crushed to obtain a fine powder. An accurately weighed, sample equivalent to 50 mg of LOK was taken in a stoppered volumetric flask (100.0 ml); 20ml of methanol was added and sonicated for 10 min. The solution was filtered through Whatmann filter paper (No. 41) and volume was made up to the mark with distilled water. After appropriate dilutions, the absorbances of the sample solutions were recorded at 251.60 nm and 224.20 nm i.e.A 251.60 and A 224.20 equations 3 and 4. Also, the same procedure is repeated for ATEN-H. After appropriate dilutions, the absorbances of the sample solutions were recorded at 224.20 nm and 271.60 nm i.e.A 224.20 and A 271.60 equations 5 and 6. The analysis procedure was repeated five times, with tablet formulations of two brands. The results of analysis of tablet formulations are presented in [Table 2].{Table 2}

Recovery studies

The recovery studies were carried out by adding a known amount of standard solution of LOK and ATL to preanalyzed tablet solutions. The recovery studies were carried at 80%, 100% and 120% level. The results of recovery studies are shown in [Table 3] and [Table 4].{Table 3}{Table 4}

 Results and Discussion



The proposed method for the determination of atenolol, linear regression of absorbance on concentration gave the equation Y= 0.01713X + 0.08503 with a correlation coefficient (r) of 0.9995; for losartan potassium, linear regression of absorbance on concentration gave the equation Y= 0.02127X + 0.03315 with a correlation coefficient (r) of 0.9991; and for hydrochlorothiazide, linear regression of absorbance on concentration gave the equation Y= 0.00657X + 0.06673 with a correlation coefficient (r) of 0.9993. Recovery studies were carried out at three different levels, by adding 80%, 100% and 120 % of pure drug solution to different samples of tablet powder solution. From the amount of drug found, percentage recovery was calculated. Precision was calculated as repeatability (% RSD) and inter and intra day variation (% RSD) for both the drugs. The repeatability and ruggedness data are presented in [Table 5]. Both the methods were successfully used to estimate the amount of ATL in combination with LOK and HCTZ present in the marketed formulation.{Table 5}

 Conclusion



Atenolol exhibited maximum absorption at 224 nm and obeyed Beer's law in the concentration range of 2-12 μg / ml; losartan potassium exhibited maximum absorption at 251 nm and obeyed Beer's law in the concentration range of 5-30 μg / ml; and hydrochlorthiazide exhibited maximum absorption at 271 nm and obeyed Beer's law in the concentration range of 2-14 μg / ml. The percentage recovery value for atenolol was 99.46% to 100.58%; for losartan potassium was 100.3% to 101.2 %; and for hydrochlorthiazide was 99.93% to 100.67%. This indicates that there is no interference of the excipients present in the formulations. The developed method was found to be accurate, precise, repeatable and reproducible and can be used for the routine analysis of atenolol, losartan potassium and hydrochlorthiazide in bulk drug and formulations.

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