• GUDIBANDA CHANDRASEKHAR REDDY GVK Biosciences Pvt. Ltd, Hyderabad, Telangana, India.
  • PULIPAKA SHYAMALA Department of Physical Chemistry Department, Andhra University, Visakhapatnam.
  • RALLABHANDI MURALI KRISHNA Department of Physical and Nuclear Chemistry and Department of Chemical Oceanography, Andhra University, Visakhapatnam, Andhra Pradesh, India.
  • KAPAVARAPU MARUTHI VENKATA NARAYANARAO GVK Biosciences Pvt. Ltd, Hyderabad, Telangana, India.
  • DURGA BABU RAPETI GVK Biosciences Pvt. Ltd, Hyderabad, Telangana, India.



Oseltamivir phosphate active pharmaceutical ingredient, Impurity-C, Impurity-D, Characterization, Method development and validation, Ultra-performance liquid chromatography


Objective: The purpose of the study is to develop a high sensitive and short runtime method to quantify oseltamivir phosphate impurities (C and D) and characterization of oseltamivir phosphate API.

Methods: The active pharmaceutical ingredient (API) characterization was done using spectroscopic techniques such as mass, infrared spectroscopy (IR), differential scanning calorimetry (DSC), proton nuclear magnetic resonance (H-NMR), phosphorus nuclear magnetic resonance (P-NMR), carbon-13 nuclear magnetic resonance (C13-NMR), and two-dimensional nuclear magnetic resonance (2D-NMR). The impurities (C and D) quantification was done using ACQUITY UPLC BEH C18- 100 mm × 2.1 mm, 1.7 μm column connected to ACQUITY UPLC with PDA detector. The optimized chromatographic conditions were achieved at 0.3 mL/min flow rate using gradient system with 0.1% orthophosphoric acid in water and acetonitrile as mobile phase. Both impurities are measured at λmax 210 nm at 30°C column temperature.

Results: The finalized method has given good peak shape and resolution for impurity-C and impurity-D at Rt = 3.39 and 4.33 min, respectively, and the quantification method is linear and its r2 > 0.999 as a correlation coefficient. The recoveries of impurity-C and impurity-D were found in the range of 100±15% at 0.05, 0.1, and 0.15 and limit of quantitation (LOQ) % concentration levels. The other validation parameters such as specificity, system precision, sensitivity, method precision, ruggedness, robustness, and solution stability were established for this method, and the results are satisfactory as per International Council for Harmonization (ICHQ2).

Conclusion: The characterization data confirm the structure of oseltamivir phosphate active pharmaceutical ingredient (API). The validated method shall be used for regular analysis as well as release analysis in quality control (QC).


Download data is not yet available.


Maurya CP, Lokhande MV. Characterization and validation of impurities related to pharmaceutical bulk drug (API) by using some analytical techniques. Int J Pharm Sci Res 2017;8:3325-40.

Malipatil SM, Jahan K, Patil SK. Development and validation of RP-HPLC method for the determination of oseltamivir phosphate in bulk drug and in dosage. Indo Glob J Pharm Sci 2011;1:57-62.

Raghuram P, Soma Raju IV, Reddy R, Sriramulu J. A stability indicating LC method for oseltamivir phosphate. Anal Chem 2008;7:617-24.

Chatpalliwar VA, Upmanyu N, Porwal PK. Validated gradient stability indicating HPLC method for determining diltiazem hydrochloride and related substances in bulk drug and novel tablet formulation. J Pharm Anal 2012;2:226-37.

International Council for Harmonisation. ICH Harmonized Tripartite Guideline, Impurities: Guidelines for Residual Solvents. Geneva: International Council for Harmonisation; 1997.

Pallavi K, Srinivasa Babu P, Kishore Babu G. Development and validation of UV spectrophotometric method and RP-HPLC method for estimation of capecitabine in bulk and tablet dosage forms. Int J Appl Pharm 2016;8:24-9.

Wal P, Tiwari R, Wal A, Tiwari G. Versatile RP-HPLC method development for quantitative estimation of telmisartan and ramipril in animal plasma. Int J Appl Pharm 2016;10:51-8.

Saeed AM, Hamzah MJ, Ahmed NQ. Quantitative assay of aspirin and (salicylic acid and heavy metals as impuraties) in IRAQI’S market aspirin tablets using different analytical Methods. Int J Appl Pharm 2018;10:167-72.

Putri KY, Abdullah Z, Istiyanto SB, Anumudu CE. The antecedents and consequences of E-health literacy in the pharmaceutical industry: An agenda for future research. Int J Appl Pharm 2020;12:1-6.



How to Cite

REDDY, G. C., P. SHYAMALA, R. MURALI KRISHNA, K. M. V. NARAYANARAO, and D. B. RAPETI. “CHARACTERIZATION OF OSELTAMIVIR PHOSPHATE API AND SIMULTANEOUS QUANTIFICATION AND VALIDATION OF ITS IMPURITIES BY UPLC”. Asian Journal of Pharmaceutical and Clinical Research, vol. 14, no. 4, Apr. 2021, pp. 161-9, doi:10.22159/ajpcr.2021.v14i4.40595.



Original Article(s)