A Validated RP- HPLC Method for Estimation of Risperidone in Oral Solution


S. Kathirvel and A. Suneetha*.

Hindu College of Pharmacy, Amaravathi Road, Guntur-500 002, A.P, India



A simple, rapid, sensitive and precise HPLC method has been developed for the estimation of risperidone in oral solution. In this method RP-C18 Phenominex Gemini column (250 mm x 4.6 mm i.d.,5µm particle size) with mobile phase consisting of 0.5% ammonium acetate buffer, acetonitrile and methanol in the ratio of 50:20:30 v/v/v in isocratic mode was used. The detection wavelength is 260 nm and the flow rate is 1.5 mL/min. In the range of 20-100µg/mL, the linearity of risperidone shows a correlation coefficient of 0.9999. The percentage recovery ranges from 98.95-101.50%. The proposed method was validated by determining sensitivity, accuracy, precision and linearity.


KEYWORDS: Risperidone, HPLC, Oral solution,Validation




Risperidone (RISP) is belonging to the chemical class of benzisoxazole derivatives and chemically, it is 4-[2-[4-(6- fluorobenzo[d]isoxazol-3-yl)-1-piperidyl] ethyl]-3-methyl-2, 6 diazabicyclo [4.4.0] deca-1, 3-dien-5-one with molecular formula C23H27FN4O2 and CAS number 106266-06-21, Risperidone is official in BP 20072. Risperidone is atypical psychotropic agent and used as an antipsychotic for bipolar disorder, borderline personality disorder, drug intoxication, brief drug-induced psychosis, and other schizophreniform and psychiatric disorder. Risperidone is mostly metabolized by alicyclic hydroxylation and oxidative N-dealkylation3. Literature review for risperidone analysis revealed several methods based on different technique, such as; visible spectrophotometric methods4, LC-MS and HPLC-ESI/MS assay for its quantification in plasma and serum5-7, Chiral Chromatography8, Pulse polarography9, Chemiluminescence’s assay10 and LC with Coulometric Detection11. A few HPLC methods 12-14 were also reported for the estimation of risperidone in tablet dosage form. However no method was reported for the estimation of risperidone in oral solution. The present work describes a simple, rapid, sensitive, accurate and precise HPLC method for the determination of risperidone in bulk as well as in oral solution.



The separation was carried out on isocratic HPLC system (Shimadzu) with Shimadzu Binary HPLC Pump, Shimadzu LC-20 AT UV-Visible Detector, Spinchrom software and RP-C18 Phenominex Gemini column (250 mm x 4.6 mm i.d., 5µm particle size). The mobile phase consisting of 0.5% ammonium acetate buffer, acetonitrile (HPLC grade) and methanol (HPLC grade) were filtered through 0.45µ membrane filter before use, degassed and were pumped from the solvent reservoir in the ratio of 50:20:30 v/v/v in to the column at the flow rate of 1.5ml/min. The detection was monitored at 260 nm and the run time was 7 min. The volume of injection loop was 20µL prior to injection of the drug solution. The column was equilibrated for at least 0.5h with the mobile phase flowing through the system.


Stock solution of risperidone was prepared by dissolving 50 mg of risperidone in 50 mL standard volumetric flask containing 50 mL of mobile phase. 5 mL of the above solution was transferred to 50 mL volumetric flask and the volume was made up to the mark with mobile phase. Subsequent dilutions of this solution were made with mobile phase to get concentration of 20-100µg/mL. The solutions were injected into the 20µL loop and the chromatogram was recorded. The calibration curve was constructed by plotting concentration vs. peak area ratio (fig.-2). The linearity experiment was carried out in triplicate to ascertain accuracy and precision of the method.



Five milliliter of risperidone oral solution (Sizodon, 1mg/mL) was transferred in to 50 mL standard volumetric flask. About 30 mL of mobile phase was added and kept in ultrasonic bath for 5 min. This solution is filtered through a membrane filter and the volume was made up to the mark with mobile phase. From this solution, further dilution was made with the mobile phase to the working concentration range of calibration curve. 20µL of the sample solution was injected under the chromatographic conditions and the chromatograms were recorded. The amount of risperidone present in oral solution was determined by comparing the peak area from the standard.



Selectivity of the method was assessed on the basis of elution of risperidone using the above mentioned chromatographic conditions. To study the accuracy, precision, reproducibility of the proposed method, recovery studies were done at three different levels. The pre-analyzed samples were spiked with 80%, 100% and 120% of the standard risperidone and the mixtures were reanalyzed by the proposed method. The estimation was made in triplicate. Percentage recovery was calculated from the amount of drug found in the solution. The results are presented in Table-2. Precision was ascertained by the determination of intra-day and inter-day variabilities and the %RSD was found to be less than 2.0, which indicates that the method is more precise.



By applying the proposed method, the retention time of risperidone was found to be 4.2 min (Fig.1). Linearity range was observed in concentration range range of 20-100µg/mL. The regression equation of risperidone was found to be Y=12.401X-9.1(r=0.9999) where Y is the peak area ratio and X is the concentration of risperidone (µg/mL). The asymmetry factor was found to be 1.091, which indicated asymmetric nature of peak. The number of theoretical plates was found to be 8661, which indicates efficient performance of the column. The limit of detection and limit of quantification found to be 0.47 and 1.43µg/mL respectively, indicates the sensitivity of the method. The recovery of risperdione was found to be 99.7%, which indicates that the proposed method is free from interference of the excipients used in oral solution. The system suitability parameters were shown in Table-1. The proposed liquid chromatographic method was applied for the determination of risperidone in oral solution (SIZODON) and the results are presented in Table-2.


Figure.1: Standard Chromatogrm of Risperidone


Table 1: Validation Summary

System  Suitability


Linearity range (µg/mL)

Correlation Coefficient

Asymmetry factor

Theoretical plates (N)

LOD (µg/mL)

LOQ (µg/mL)

Percentage recovery









Figure.2: Linearity Curve of risperidone


Table 2: Assay and Recovery Studies

Formulation (mg/ml)

Label claim (mg/ml)

Amount found

Amount found *(%)

Recovery (%)

RSD (%)

Brand name












*Mean of five determinations.


The proposed HPLC method was found to be highly accurate, sensitive and precise. Therefore this method can be applied for the routine quality control analysis of risperidone in oral solution.



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Received on 20.06.2011

Accepted on 12.08.2011        

© A&V Publication all right reserved

Research Journal of Pharmaceutical Dosage Forms and Technology. 3(4): July-Aug. 2011, 139-141