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International Journal of Drug Development and Research

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- (2012) Volume 4, Issue 1

Development and Validation of Spectrophotometric method for Simultaneous estimation of Lafutidine and Domperidone in combined dosage form by area under curve method

Shefali Rana*, Jigar Pandya, Mr. Sagar Solanki, Dr. Mandev Patel
Department of Quality Assurance, K.B.Raval College of Pharmacy, At Shertha, Gandhinagar, Gujarat, India
Corresponding Author:Shefali Rana E.mail: rnshefali@gmail.com 9409285599
Received:06 August 2011 Accepted: 02 October 2011
Citation: Shefali Rana*, Jigar Pandya, Mr. Sagar Solanki, Dr. Mandev Patel “Development and Validation of Spectrophotometric method for Simultaneous estimation of Lafutidine and Domperidone in combined dosage form by area under curve method”, Int. J. Drug Dev. & Res., Jan- March 2012, 4(1): 257-262 doi: doi number
Copyright: © 2010 IJDDR, Shefali Rana et al. This is an open access paper distributed under the copyright agreement with Serials Publication, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract

A simple, accurate, rapid and precise spectrophotometric method has been developed for simultaneous estimation of Lafutidine and Domperidone in pharmaceutical dosage form. This method was based on UV spectrophotometric determination of two drugs, using Area under Curve method. It involves measurement of area under curve in the range of 268-278 nm (For Lafutidine) and 282.2-292.2 nm (For Domperidone) for the analysis in methanol. The linearity was observed in the concentration range of 2-12 μg/ml for Lafutidine and 3-18 μg/ml for Domperidone. The method showed good reproducibility and recovery with % RSD less than 2. Method was found to be rapid, specific, precise and accurate, can be successfully applied for the routine analysis of Lafutidine and Domperidone in bulk, and combined dosage form without any interference by the excipients. The method was validated according to ICH guidelines.

Keywords

Lafutidine, Domperidone, Area under Curve Method, Ultraviolet Spectrophotometry

Introduction

Lafutidine (LAF) is 2-(furan-2-ylmethylsulfinyl)-N- [4-[4-(piperidin-1-ylmethyl) pyridin-2-yl] oxybut-2- enyl]acetamide[1] .It belongs to the class of H2- receptor antagonists. Used in the treatment of peptic ulcer and gastro-oesophageal reflux disease (GERD). The literature reports some of the analytical methods like LC–ESI–MS method for the quantitation of
lafutidine in human plasma Application to pharmacokinetic studies [2], A single LC–tandem mass spectrometry method for the simultaneous determination of four H2 antagonists in human plasma[3], Determination of lafutidine in human plasma by high-performance liquid chromatographyelectrospray ionization mass spectrometry: application to a bioequivalence study[4]. Determination of lafutidine in human plasma by HPLC-MS [5], Analytical method for determination of Lafutidine by RP-HPLC [6], and in serum by RPHPLC method [7].
Domperidone (DOM) chemically (5-chloro-1-{1-[3- (2, 3-dihydro-2-oxo-1H-benzimidazol-1-yl) propyl] - 4- piperidinyl} benzimidazolin-2-one) [8-10] is a dopamine antagonist with antiemetic properties. It stimulates gastro-intestinal motility and is used as an antiemetic for the short term treatment of nausea and vomiting. Literature reports many analytical methods like UV spectrophtometric methods, Tandem liquid chromatography, LC- tandem MS and RP –HPLC methods for determination of domperidone alone and in combination with other drugs [11-24].
The validation of method carried out as per ICH guidelines [25]. However, there are no reported methods for simultaneous estimation of both drugs in combination. This paper presents two simple, rapid, reproducible and economical method for the simultaneous estimation of both the drugs.

Experimental Condition

Instrument
A Shimadzu UV-VIS Spectrophotometer 1800 with 1.0 cm matched quartz cells was used.

Materials and Method

Standard gift samples of Lafutidine and Domperidone were procured From Ajanta Pharmaceuticals Ltd, Mumbai and Dwarkesh Pharmaceuticals Pvt. Ltd, Gujarat. Combined dosage formulation containing Lafutidine and Domperidone were purchased from local market (LAFUDAC-D).
Preparation of standard stock solution (100 µg/ml)
The stock solution (100 µg/ml) of LAF and DOM were prepared separately by dissolving accurately about 10 mg of drug in Methanol and the volume was made up to 100 ml with Methanol to prepare standard stock solution (100 µg/mL).
Preparation of Calibration curve of LAF and DOM
The standard stock solution (100 µg/ml) of LAF and DOM were further diluted to obtain the final concentration 2, 4, 6, 8, 10, 12 µg/ml and 3, 6, 9, 12, 15, 18 µg/ml respectively.Both the solutions were scanned in the spectrum mode from 200.0nm to 400.0nm. The maximum absorbance of LAF and DOM was observed at 273 nm and 287.2nm, respectively. From the overlain spectra of both drugs obtained after scanning of standard solution of LAF and DOM, area under the curve in the range of 268-278 nm and 282.2-292.2 nm was measured for the analysis respectively. The absorptivity values calculated. The calibration curve was plotted with concentration v/s area under the curve and regression equation was calculated
Determination of Absorptivity values
Absorptivity = Absorbance/ Concentration of that component in gm/l.
Concentration of LAF and DOM was calculated using following formula;
CLAF = A2ay1 - A1ay2 / ax2ay1- ax1ay2 - (1)
CDOM = A1ax2- A2ax1 / ax2ay1- ax1ay2 - (2)
Where,
CLAF = Concentrations of LAF,
CDOM = Concentrations of DOM,
A1 = Area at 268-278 nm,
A2 = Area at 282.2-292.2 nm,
ax1 = Absorptivity value of LAF at 268-278 nm,
ax2 = Absorptivity value of LAF at 282.2-292.2 nm,
ay1 = Absorptivity value of DOM at 268-278 nm,
ay2 = Absorptivity value of DOM at 282.2-292.2 nm.
Procedure for the assay of LAF and DOM in Capsule
For the estimation of drugs in the commercial formulations, twenty capsules containing 10 mg of LAF and 30 mg of DOM were weighed and average weight was calculated. The capsules were crushed and powdered in glass mortar. For the analysis of drugs, quantity of powder equivalent to 5 mg of LAF and 15 mg of DOM was transferred to 50 ml volumetric flasks and dissolved in sufficient quantity of Methanol. It was sonicated for 30 mins and volume was made up to obtain a stock solution of 10 µg/ml LAF (maintaining 30 µg/ml of DOM). This solution was then filtered through Whatmann filter paper no. 1. The concentration of both LAF and DOM was determined by measuring absorbances of sample solutions in wavelength range of 268-278 nm (for LAF) and 282.2-292.2 nm (for DOM) using equation 1 and 2. Results of capsule analysis are shown in Table 1. FULL Leng th Re s e a r ch Pape r Cov e
Validation: The method was validated according to ICH guidelines to study linearity, accuracy, precision, LOD and LOQ.
Linearity
The measurement of linearity was evaluated by analyzing different concentrations of the standard solution of LAF and DOM. For both the methods, the Beer law was obeyed in the concentration range 2-12 µg/ml and 3-18 µg/ml for LAF and DOM respectively (Table-3). The absorbance was plotted against the corresponding concentrations to obtain the calibration graphs.
Precision
The reproducibility of the proposed methods was determined by performing tablet assay at different time intervals on same day (Intra-day precision) and on three different days (Inter-day precision) (Table - 3).
The LOD and LOQ were separately determined based on calibration curve. The residual standard deviation of a regression line or the standard deviation of y- intercepts of regression lines were used to calculate the LOD and LOQ (Table- 3). The detection limit (LOD) may be expressed as: LOD = 3.3 s/S and the quantitation limit (LOQ) may be expressed as: LOQ =10 s/S Where, s = the standard deviation of the response S = the slope of the calibration curve.
Accuracy (% Recovery studies)
To ascertain the accuracy of proposed methods, recovery studies were carried out by standard addition method at three different levels (50%, 100% and 150%). Percent recovery was calculated for LAF and DOM, by this method (Table-2). Here three times repetition done with proposed procedure.

Result and Discussion

The present work provides an accurate, reproducible, sensitive method for the simultaneous analysis of LAF & DOM in bulk and capsule formulation. Linear relationships between drug concentrations were obtained over the range of at 2-12 µg/ml & 3-18 µg/ml for LAF and DOM respectively. Under experimental conditions described assay of capsule, linearity, accuracy studies and precision, LOD and LOQ were estimated. Correlation coefficient was found to be > 0.995. The results of commercial capsule formulation are presented in Table 1. The % assay was found to be 98.89- 100.90% for LAF and 99.43-100.30% for DOM, and S.D. and R.S.D. for six determinations of capsule sample, by this method, was found to be less than 2.0 indicating the precision of this method. No interference was observed from the pharmaceutical adjuvants /excipients.

Conclusion

The UV spectrophotometric method was developed and validated as per ICH guidelines. The standard deviation and % RSD calculated for the proposed method are within limits, indicating high degree of precision of the method. The results of the recovery studies performed indicate the method to be accurate. Hence, it can be concluded that the developed spectrophotometric method is accurate, precise and can be employed successfully for the estimation of LAF and DOM in bulk and formulation.

Acknowledgment

The authors are thankful to Ajanta Pharmaceuticals Ltd and Dwarkesh Pharmaceuticals Pvt Ltd for providing standard drug samples and also to K.B.Raval College of Pharmacy for providing the facilities to carry out the research work.

Tables at a glance

Table icon Table icon Table icon
Table 1 Table 2 Table 3
 

Figures at a glance

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Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
 
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