An alternative method to the evaluation of similarity factor in dissolution testing

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems

Background:

• The similarity factor f(2) is a common criterion for evaluating in-vitro dissolution profile similarity, as per SUPAC-IR guidance.
• Assessing similarity between dissolution profiles is crucial for drug product development and quality control.

Purpose of the Study:

• To investigate alternative methods for evaluating similarity between in-vitro dissolution profiles.
• To compare the performance of different dissolution parameters and release models in assessing profile similarity.

Main Methods:

• Diltiazem hydrochloride sustained-release tablets were used for in-vitro dissolution testing.
• Parameters such as dissolution time (t10%, t25%, t50%), mean dissolution time (MDT), and dissolution efficiency (DE) were analyzed.
• Various release models (Higuchi, zero order, first order, Baker-Lonsdale, Hixson-Crowell, Weibull, Korsmeyer-Peppas) were applied.
• Similarity assessment was performed using difference factor (f1), similarity factor (f2), and Rescigno indices (xi1, xi2).
• USP Apparatus 2 was utilized for dissolution studies.

Main Results:

• The study evaluated multiple dissolution parameters and release models to compare in-vitro dissolution profiles.
• Pair-wise independent-model procedures were employed to assess profile similarities.
• The in-vitro release kinetics of diltiazem hydrochloride SR tablets were thoroughly analyzed.

Conclusions:

• The research provides insights into alternative approaches for dissolution profile similarity assessment.
• Findings contribute to a better understanding of dissolution testing methodologies for sustained-release formulations.
• This work supports the development of robust methods for pharmaceutical product characterization.