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Effect of sample preparation method on quantification of polymorphs using PXRD.

Shahnwaz Alam¹, Sarsvatkumar Patel, Arvind Kumar Bansal

¹Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Nagar, Mohali, India.

Pharmaceutical Development and Technology

|October 22, 2009

Summary

This summary is machine-generated.

Ball milling enhanced the sensitivity and accuracy of powder X-ray diffraction for analyzing clopidogrel bisulphate polymorphic mixtures. This method achieved high precision and reproducibility for quantitative analysis.

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Area of Science:

Pharmaceutical Sciences
Analytical Chemistry
Materials Science

Background:

Quantitative analysis of polymorphic mixtures is crucial for drug development and quality control.
Polymorphism in active pharmaceutical ingredients (APIs) can significantly impact drug efficacy and bioavailability.
Accurate detection and quantification of different polymorphic forms are essential for ensuring product consistency.

Purpose of the Study:

To enhance the sensitivity and accuracy of quantitative analysis for polymorphic mixtures.
To optimize powder X-ray diffraction (PXRD) parameters for rapid and high-resolution analysis.
To evaluate different sample preparation techniques for improved polymorphic quantification.

Main Methods:

Preparation of binary mixtures of clopidogrel bisulphate (Form I and Form II) using hand grinding, air jet milling, and ball milling.
Optimization of PXRD scan rate by varying step time and step size.
Quantitative analysis of polymorphic mixtures using optimized PXRD method.
Method validation including assessment of Limit of Detection (LOD) and Limit of Quantification (LOQ).

Main Results:

Ball milling and grinding demonstrated superior analytical sensitivity and accuracy compared to other preparation methods.
Optimized PXRD parameters (0.05° step size, 5s step time) identified maximum characteristic peaks.
The PXRD method was found to be reproducible and precise, with an LOD of 0.29% and LOQ of 0.91%.
Validation yielded an excellent correlation (R² > 0.9999) between actual and predicted concentrations.

Conclusions:

Ball milling is an effective technique for preparing samples for accurate quantitative analysis of clopidogrel bisulphate polymorphs.
The optimized powder X-ray diffraction method provides a sensitive, accurate, and reproducible approach for analyzing polymorphic mixtures.
This study offers a validated method for the quantitative analysis of polymorphic forms, crucial for pharmaceutical quality control.