DEVELOPMENT AND VALIDATION OF STABILITY INDICATING RP-HPLC METHOD FOR ESTIMATION OF MANIDIPINE HYDROCHLORIDE IN PHARMACEUTICAL DOSAGE FORM

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ABOUT AUTHORS
Bhavik S. Patel*, Chetan A. Prajapati
Department of Quality Assurance
Pacific College of Pharmacy, Udaipur, Rajasthan, India
*bhavikpatel412@gmail.com

ABSTRACT
A novel, precise, accurate and rapid isocratic reversed-phase high performance liquid chromatographic (RP-HPLC) method was developed, optimized and validated for determination of Manidipine HCL. novel stability-indicating RP-HPLC method has been develop and validated for quantitative analysis of Manidipine HCL in in its pharmaceutical dosage forms using Column -Inertsil ODS 3v column (150 mm x 4.6 mm i.d., 5 μm)  with Phosphate buffer (pH-2.2) : Acetonitrile (60:40) as isocratic mobile phase at a flow rate of 1.4 ml/min and wavelength of 228 nm. The calibration curves were linear over the concentration ranges of 20-150 μg/ml for Manidipine HCL. The limit of detection (LOD) and limit of quantification (LOQ) for Manidipine HCL were 0.48 and 1.47 μg/ml.Recovery of Manidipine HCL the pharmaceutical dosage form ranged from 99.89-100.71%.
Manidipine HCL was subjected to stress conditions (Hydrolysis (acid, base), oxidation, thermal and photo degradation) and the stressed samples were analysed by use of the method. Degradation was observed in acid, base, and 30% H2O2.

REFERENCE ID: PHARMATUTOR-ART-2266

PharmaTutor (ISSN: 2347 - 7881)

Volume 2, Issue 11

Received On: 23/09/2014; Accepted On: 26/09/2014; Published On: 01/11/2014

How to cite this article: BS Patel, CA Prajapati; Development and Validation of Stability Indicating RP-HPLC Method for Estimation of Manidipine Hydrochloride in Pharmaceutical Dosage Form; PharmaTutor; 2014; 2(11); 89-101

INTRODUCTION
Manidipine HCL(MND)is chemically 2-[4-(diphenylmethyl)piperazin-1-yl]ethyl methyl 2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate(Figure 1). is a well-known Antihypertensive agent[1]. Manidipine is a dihydropyridine calcium-channel blocker. It causes vasodilation by blocking the entry of calcium into the arteriolar muscle cells. Manidipine also appears to have some renally protective effects[2-3]. Manidipine is not official in IP, USP and BP but official in JP.JP describe liquid chromatography method for its estimation[4]. Literature survey reveals UV[5], HPLC[6-8] methods for estimation of MND. Manidipine HCL(MND) is official in Japanese Pharmacopeia (JP). JP liquid chromatography method for its estimation.

Development of stability indicating assays, using the approach of stress testing as determined by the International Conference on Harmonization (ICH) guidelines [9], is highly recommended for the QC of pharmaceutical formulations[10-12]. Manidipine HCL(MND) is commercially available but at the moment is not available in any pharmacopoeia the aim of the present research was to develop and validate a simple stability-indicating high performance liquid chromatographic method for the quantitative analysis of MND in tablet dosage form[12-16]

EXPERIMENTS
Apparatus

· RP-HPLC instrument equipped with a UV-Visible detector and a photodiode array detector, (Shimadzu, LC-2010CHT, Japan,) and agilent (EZ chrome software) auto sampler, (Inertsil ODS 3v column (150 mm x 4.6 mm i.d., 5 μm))and Shimanzu CLASS VP software were used.
· Analytical balance (Sartorius CP224S, Germany)
· Triple distillation unit consisting of borosilicate glass
· Digital pH meter (LI 712 pH analyzer, Elico Ltd., Ahemedabad)
· Ultra sonic cleaner (Frontline FS 4, Mumbai, India)

Reagents and materials
Manidipine HCL was purchased from trader. mili-Q (HPLC grade) water, Acetonitrile (AR Grade, S. D. Fine Chemicals Ltd., Mumbai, India) and Whatman filter paper no. 41 (Millipore, USA) were used in the study.

Preparation of mobile phase:
Phosphate buffer (pH-2.2)*: ACN (60:40) was taken in glass bottle, mixed it properly and sonicated for 15 minutes.

3.4 gm of KH2PO4 was weighed and dissolved in to 1000 ml mili-Q (HPLC grade) water; pH was adjusted to 2.2with Orto-phosphoric acid to give a phosphate buffer (pH-2.2).

Preparation of standard stock solutions
A 50 mg of standard Manidipine was accurately weighed and transferred to a 50ml volumetric flask and dissolved in 15 ml diluent (ACN:Water, 50 : 50). The flask was sonicated for 10 min. The flask was shaken and volume was made up to the mark with diluent to give a solution containing 1000 μg/ml of Manidipine.

Preparation of Sample Solution
Twenty tablets were weighed. Powder equivalent to 50 mg of Manidipine was transferred to 50 ml of volumetric flask containing 20 ml diluent (ACN : Water, 50: 50), sonicated for 20 min. The flask was shaken and volume was made up to the mark with diluent (ACN: Water, 50:50). The above solution was filtered through Milipore filter (0.45 μ). 5 ml of aliquot was taken and transferred to volumetric flask of 50 ml capacity and volume was made up to the mark with the diluent to give a solution containing 100 μg/ml Manidipine. This solution was used for the estimation of manidipine in tablet dosage form.(Table-1)

FORCED DEGRADATION STUDY[17-22]
Acid Degradation
:
50 mg of Manidipine HCL API was accurately weighed and transfer it to a 50ml volumetric flask. Add 5ml of diluent (ACN: Water, 50:50)in to this flask and 5ml of 5N HCL and kept this flask at 800C for 3 hrs. After that kept this flask at room temperature for cooling. After cooling add 4.5 ml of 5M NaOH to neutralize the solution and made up the volume up to the mark with diluent. From this solution 5 ml aliquot was taken into another 50ml volumetric flask and made volume upto the mark with diluent (100 μg/ml) and chromatographed to check the interference from the degradation products. Similarly, tablet powder equivalent to 50mg of  Manidipine was accurately weighed and transfer it to a 50ml volumetric flask and degradation was carried out similarly as that with API.

Alkali Degradation:
It was carried out as per the procedure described for the acid degradation using 0.1 M NaOH instead of 5 N HCl.

Peroxide Degradation:
It was carried out as per the procedure described for the acid degradation using 30% H2O2 instead of 5 N HCl.

Thermal Degradation:
API and Tablet of Manidipine HCLwere  kept in the Hot air oven at 100ºC for 3 days and from this 100 μg/ml solution containing Manidipine was prepared. This solution was chromatographed to check the specificity.

Photo Degradation:
API and Tablet of Manidipine were kept in the UV chamber at 254-366nm (energy: 1.2 lux/hr) for 48 hrs and from this 100 μg/ml solution containing Manidipine was prepared. This solution was chromatographed to check the specificity.

For each degradation, blank solutions were also prepared without taking API or tablet powder as per the same procedure described above. Each blank was injected separately and chromatoghraphed.

Chromatograms of blank solutions were compared with respective sample chromatograms to check the interference of HCl, NaOH and H2O2, Thermal and Photolytic.

Note: Minimum 10 to 30 % degradation should be achieved in applied stress conditions. Final concentration of all the sample preparations should be approximately equal to the test concentration specified in method and final dilution shall be in diluent.

Chromatographic Condition
- Column :Inertsil ODS 3v column (150 mm x 4.6 mm i.d., 5 μm)
- Mobile phase: Phosphate buffer(pH-2.2) : Acetonitrile (60:40)
- Flow rate: 1.4 ml/min
- Injection volume: 10 μl
- Wave length: 228 nm
- Column temperature: 40°C
- Run time: 12 min

METHOD DEVELOPMENT[23-26]
Developed RP-HPLC method was validated by different parameters as per ICH guidelines.

Specificity
Specificity of an analytical method is ability to measure specifically the analyte of interest without interferences from blank and placebo.

Check for interference from blank and forced degradation product
The API and drug samples were prepared as described in 5.1.4. After degradation, samples were analyzed and separation of the degradant product peaks from main peaks was checked.

Linearity and range
Appropriate volume of aliquots (1, 2, 3, 4, 5, 6,7.5 ) from standard stock of Manidipine containing (1000 μg/ml) were transferred to volumetric flasks of 50 ml capacity. The volume was adjusted to the mark with diluent (ACN: Water, 50:50) give a solution containing 20, 40, 60, 80, 100, 120 and 150 μg/ml Manidipine. The standard solutions was chromatographed for 12 min using mobile phase at a flow rate of 1.4 ml/min. Graph was plotted for peak area vs. concentration for the drug.

Precision
a)Repeatability:
Method precision for assay was established by determining the assay of six sample preparations of Manidipine(100 μg/ml) under same conditions. Six replicates of sample were prepared at sample concentration and analyzed on same day, and % RSD was reported.

b) Intermediate precision (Reproducibility)
The intraday and interday precision of the proposed method was determined by analyzing the corresponding responses 3 times on the same day (intraday) and 3 on different days(interday) for 3 different concentrations of standard solutions Manidipine (50, 100 and 150 μg/ml). The results were reported in terms of relative standard deviation (% RSD).

Accuracy (% Recovery)
Accuracy was determined over the range 50 % to 150 % of the sample concentration. Calculated amount Manidipine API was added in placebo to attain 50 %, 100 % and 150 % of sample concentration.

Each sample was prepared in triplicate at each level and injected. The chromatograms were recorded and from the peak area of drug, % recovery was calculated from regression equation of the calibration curve.

Robustness
The following parameters were changed one by one and their effects were observed on area of peak, when chromatographed, every condition is repeated for the three times.
a) Mobile phase ratio (± 2% absolute) as buffer: ACN (58: 42), buffer: ACN (62: 38).
b) pH of the mobile phase (± 2% absolute) as 5.2 pH and 5.7 pH of the mobile phase.

Limit of detection & Limit of quantification
The limit of detection (LOD) and the limit of quantification (LOQ) of the drug were derived by using the following equations as per International Conference on Harmonization (ICH) guidelines.
LOD = 3.3 × σ /S
LOQ = 10 × σ /S

Where σ = the standard deviation of the response
S = Slope of calibration curve.

RESULTS AND DISCUSSION:
Selection of mobile phase:

Various mobile phase systems were tried such as,
1. Methanol : water at concentration of 50:50
2. Acetonitrile : water at concentration of 50:50
3. Acetonitrile : phosphate buffer (pH 4.6) at concentration of  50:50.
4. Acetonitrile:, phosphate buffer (pH 3) at concentration of 60:40,
5. Acetonitrile:, phosphate buffer (pH 2.2) at concentration of 60 : 40, at a flow rate of  1.4 ml/min and the chromatograms were recorded.

Specificity
Placebo and standard drugs were used to determine the specificity of the developed method and chromatogram was recorded (fig.2,3& 4)

Linearity
Solutions of different concentrations were prepared (20-150 μg/ml of Manidipine) and chromatographed and area was recorded (Table 2). From the linearity graph (fig.5&6), correlation coefficient, slope and intercept were calculated and shown in (Table-3). Correlation coefficient is in accordance with ICH guidelines

Accuracy
Recovery was checked at three concentration level (50%, 100% and 150%). % Recovery for individual and mean value (n=3) at each level was recorded in (Table -4)

Method Precision (% Repeatability)
Six sample preparations containing 100 μg/ml of Manidipine was chromatographed and % RSD of area was calculated (Table-5)

Intermediate Precision (Reproducibility)
Three replicate of three concentration were chromatographed intraday and inerday and % RSD were calculated .(Table-6)

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