Stability-Indicating HPLC Method for Remdesivir analysis in Pharmaceutical Formulations and Bioavailability Studies
Table of Contents
This study details the growth and validation of a robust, stability-indicating reversed-phase high-performance liquid chromatography (RP-HPLC) method for the quantitative determination of remdesivir (RMD) in various pharmaceutical formulations and biological samples. The method is designed to support quality control testing and pharmacokinetic assessments, crucial for evaluating the in vivo bioavailability of remdesivir formulations.
Background on Remdesivir
Remdesivir is an antiviral medication that gained prominence during the COVID-19 pandemic. National Institutes of Health initially recommended its use for certain hospitalized COVID-19 patients. Accurate and reliable analytical methods are essential for ensuring the quality, safety, and efficacy of remdesivir drug products, as well as for monitoring drug levels in patients during clinical trials and treatment.
Method Development and Validation
The developed RP-HPLC method utilizes an isocratic separation, meaning the mobile phase composition remains constant throughout the analysis. This simplifies the method and enhances its robustness. Key aspects of the method are outlined below:
* Chromatographic Conditions:
* Column: Zorbax Eclipse Plus C-18 (4.6 × 250 mm, 5 μm)
* Mobile Phase: 1% Trifluoroacetic Acid (TFA) and Acetonitrile (55:45 v/v)
* Flow rate: 1 mL/min
* Detection: Variable Wavelength Detector (VWD) at 254 nm
* Validation Parameters (following cGMP guidelines):
* System Suitability: Ensured the chromatographic system performed consistently and reliably.
* Linearity: Demonstrated a linear response of remdesivir concentration over a range of 12-120 µg/mL, wiht a correlation coefficient (R2) of 0.999. This indicates the method provides accurate results within this concentration range.
* Specificity: Confirmed the method’s ability to accurately measure remdesivir in the presence of potential interfering substances, including degradation products.
* Precision: Established the repeatability and reproducibility of the method, demonstrating low variability in results.
* Accuracy: Verified the method’s ability to provide results close to the true value.
* Robustness: Assessed the method’s resilience to small, deliberate variations in chromatographic parameters (e.g., mobile phase composition, flow rate, temperature).
* Forced Degradation Studies: Evaluated the method’s ability to detect and quantify remdesivir degradation products under various stress conditions (e.g., heat, light, acid, base, oxidation).This is crucial for stability indicating methods.
* Performance Characteristics:
* Limit of Detection (LOD): 0.73 µg/mL
* Limit of Quantification (LOQ): 2.22 µg/mL
* Retention Time: Consistent with remdesivir standards,ensuring accurate identification.
Application of the Method
This validated method is suitable for analyzing remdesivir in a variety of pharmaceutical formulations, including:
* Freeze-dried powders
* Microspheres
* novasomes
Furthermore, the method can be applied to the analysis of remdesivir in biological matrices, such as blood, making it valuable for bioavailability and pharmacokinetic studies. Pharmacokinetics is the study of how the body absorbs, distributes, metabolizes, and eliminates a drug.
Significance and Future Directions
The development of this stability-indicating HPLC method provides a reliable analytical tool for the quality control and pharmacokinetic evaluation of remdesivir formulations. The method’s robustness and specificity ensure accurate and consistent results,supporting the development and manufacturing of safe and effective remdesivir-based therapies.
Future research could focus on adapting this method for high-throughput analysis, perhaps using mass spectrometry detection for increased sensitivity and selectivity. Further examination into the degradation pathways of remdesivir under various storage conditions would also be beneficial for optimizing formulation stability.
Keywords: RP-HPLC; Remdesivir; Stability indicating method.