A REVIEW OF ANALYTICAL METHODS FOR DETERMINATION OF PRAVASTATIN IN PHARMACEUTICAL DOSAGE FORMS AND BIOLOGICAL FLUIDS

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ABOUT AUTHORS
Grishma Trivedi*, Hasumati Raj
Shree Dhanvantary Pharmacy College,
Kim, Gujarat
*trivedigrishma18@gmail.com

ABSTRACT
Pravastatin is an inhibitor of HMG-CoA reductase inhibitor which is used as a hypolipidemic agent to reduce cholesterol level. Chemically, 9-Fluoro-11β,17-dihydroxy-16α-methyl-3,20-dioxopregna-1,4-dien-21-yl disodium phosphate. Pravastatin is a drug of choice for the cardiovascular disease. It reduces the coronary and cerebrovascular morbidity and mortality in middle aged individual. Elevated plasma concentration of C-reactive protein are associated with protein increased cardiovascular disease, long term therapy with pravastatin an agent that reduces cardiovascular risk, might alter levels of this inflammatory parameter. This review consist of various analytical methods for the determination of pravastatin in various marketed pharmaceutical formulation of biological fluid. Analytical methods consist of various chromatographic methods, spectrophotometer methods and electrical methods reported for determination of pravastatin.

REFERENCE ID: PHARMATUTOR-ART-2277

INTRODUCTION^(1,2):

STRUCTURAL FORMULA:

Figure No.1: structure of pravastatin

MOLECULAR FORMULA: C₂₃H₃₅N_aO₇

MOLECULAR WEIGHT: 446.5gm/mol

CHEMICAL NAME: 9-Fluoro-11β,17-dihydroxy-16α-methyl-3,20-dioxopregna-1,4-dien-21-yl disodium phosphate

CATEGORY:HMG Co-A reductase inhibitor, lipid regulating drug, anticholesteremic agent

DOSE: 40mg daily

DESCRIPTION: White to yellowish–white powder or crystalline powder, hygroscopic

SOLUBILITY: Freely soluble in water and in methanol, soluble in anhydrous ethanol

PHARMACOLOGICAL ACTION⁽²⁾:
Pravastatin is structurally similar to the HMG, a substituent of the endogenous substrate of HMG-CoA reductase. Unlike its parent compound, mevastatin, and statins such as lovastatin and simvastatin, pravastatin does not need to be activated in vivo. Its hydrolyzed lactone ring mimics the tetrahedral intermediate produced by the reductase allowing the agent to bind with a much greater affinity than its natural substrate. The bicyclic portion of pravastatin binds to the coenzyme A portion of the active site. Pravastatin sodium produces its lipid-lowering effect in two ways. First, as a consequence of its reversible inhibition of HMG-CoA reductase activity, it effects modest reductions in intracellular pools of cholesterol. This results in an increase in the number of LDL-receptors on cell surfaces and enhanced receptor-mediated catabolism and clearance of circulating LDL. Second, pravastatin inhibits LDL production by inhibiting hepatic synthesis of VLDL, the LDL precursor.

PHARMACOKINETIC ACTION⁽²⁾:
Pravastatin is rapidly absorbed with peak plasma levels of the parent compound achieved 1 to 1.5 hours after administration. The average oral absorption of pravastatin is 34% and absolute bioavailability is 17%. These values however, are variable. Food decreases the systemic bioavailability but the lipid-lowering effect is not impacted. It is metabolise by liver and it excretion by urine(20%) and feces(70%).

SIDE EFFECT⁽³⁾:
Difficulty with moving, muscle or bone pain, muscle stiffness, chest pain or discomf, chills, cough, dark-colored urine, diarrhea, difficult or labored breathing, fever, headache, loss of appetite, muscle cramps or spasms, muscular tenderness, wasting, or weakness, nasal congestion, nausea, runny nose, shivering, sneezing, sore throat, sweating, swollen joints, tightness in the chest, trouble with sleeping, unusual tiredness or weakness, vomiting

ANALYTICAL METHODS:
This all are the methods which are used for the determination of Pravastatin in marketed formulation and in biological fluids. This all analytical methods are reported which are seen during the literature survey. This article describes the review on the all reported analytical methods with specific conditions.

I. COMPENDIAL METHODS:

Table No.1:Summary of official compendial methods

II. UV SPECTROSCOPIC METHOD:
A simple, precise and economical spectrophotometric method for the estimation of Pravastatin in pharmaceutical bulk and tablet dosage form was developed and validated. Identification was carried out using a UV- visible double beams pectrophotometer detector with working waveleng that 240nm in water and methanol medium. The method was validated with respect to its specificity, linearity range, accuracy, and precisionin analytical media. Pravastatin show the maximum absorbance(λmax) at240nm. Simple UV spectroscopy, first derivative spectroscopy, AUC method and absorption ratio methods are reported for determination of the Pravastatin in marketed formulation. Below in table describes the various chromatographic methods with the method description and condition which are reported on review literature.

Table No.2: Summary of UV spectroscopic methods of Pravastatin

III. CHROMATOGRAPHIC METHODS:
Various chromatographic methods are used for the determination of the Pravastatin alone or combination with other drugs in various marketed formulation and in biological fluids like human plasma and urine. Chromatographic methods like High performance liquid chromatography (HPLC/RP-HPLC), High performance thin layer chromatography (HPTLC) with UV detection are used. In which the stationary phase commonly used is C18 column and commonly used wavelength for detection is 240nm. Mobile phase is varies with condition of method in various proportion. Below in table describes the summary of the various chromatographic methods are used with the method description.

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Table No.3: Summary of Chromatographic Methods of Pravastatin

IV. MISCELLANOUS METHODS:
Most widely used methods are mainly HPLC, UV and HPTLC for determination of  Pravastatin in various formulation or in biological fluids but along with that other methods are also used which are seen during the literature survey. The summary of that methods are described below in table. 

Table No.4: Summary of Miscellaneous methods of Pravastatin

CONCLUSION
The presented review highlights on various analytical methods reported on Pravastatin and in combination with other drug. HPLC-HPTLC-UV methods were found to be most widely used. Various chromatographic conditions are presented in under Table. The faster time, high sensitivity; specificity and better separation efficiency enable HPLC to be used frequently for the determination of Pravastatin in the comparison with the other methods. There is no doubt on the fact that these chromatographic methods are rapid and far more economical. Other methods are also useful. In this way various analytical methods for the estimation of Pravastatin in bulk or in various matrixes like plasma, alone or in combination with other drugs is discussed. The presented information is useful for the researchers especially those involved in the formulation development and quality control of Pravastatin in combination with other drug.

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