A validated stability indicating ion-pair RP-LC method for zoledronic acid.

Area of Science:

• Analytical Chemistry
• Pharmaceutical Analysis

Background:

• Zoledronic acid is a bisphosphonate used to treat bone diseases.
• Ensuring the quality and stability of pharmaceutical products is critical for patient safety and therapeutic efficacy.
• Stability-indicating methods are essential for detecting and quantifying drug degradation products.

Purpose of the Study:

• To develop and validate a stability-indicating high performance liquid chromatographic (HPLC) assay method for zoledronic acid.
• To assess the degradation behavior of zoledronic acid under various stress conditions.
• To ensure the method's suitability for routine quality control and stability testing.

Main Methods:

• Forced degradation studies were conducted on zoledronic acid under hydrolysis, oxidation, photolysis, and thermal stress.
• A reversed-phase HPLC method using a C18 column was developed with a mobile phase consisting of a phosphate buffer with tetra butyl ammonium hydrogen sulphate and methanol.
• The HPLC method was rigorously validated for parameters including response function, precision, accuracy, specificity, and robustness.

Main Results:

• Zoledronic acid showed degradation primarily under oxidative stress at elevated temperatures.
• The developed HPLC method successfully separated zoledronic acid from its degradation products.
• The method demonstrated excellent validation results, confirming its reliability and suitability.

Conclusions:

• A robust and validated stability-indicating HPLC method for zoledronic acid has been successfully developed.
• This method is effective for determining related substances and assay, ensuring the quality of zoledronic acid.
• The developed method is suitable for routine quality control and stability studies of zoledronic acid formulations.