X-Ray Powder Diffraction Services
X-ray powder diffraction (XRPD) analysis provides critical information regarding the solid form of your product, supporting drug discovery and development, regulatory submissions, formulation development, batch release and storage stability. X-ray powder diffraction is rapid, non-destructive, adaptable and very widely applied.
Characterisation by X-ray powder diffraction (XRPD) is fundamental to determining key physical properties such as polymorphic form, crystallinity and amorphicity, plus phase purity and phase quantification.
Comparison against a library database of expected polymorph or reference materials facilitates identification.
Solid form, polymorphism and phase purity
Many solid materials, such as pharmaceutical intermediates, APIs and final products, can exhibit polymorphism – the ability of a solid to express more than one crystalline form – and different polymorphs of the same material can exhibit startlingly different properties, from melting point and hydration state, to dissolution performance, long term physical stability and bioavailability. Hence, understanding the polymorphic behavior of your product is of key importance – and a regulatory expectation.
XRPD can be used to understand this behavior, as each polymorph – or pseudo-polymorph, solvate, co-crystal, or salt form – will demonstrate a unique diffraction pattern. This facilitates the monitoring of any polymorphic or solid form changes that may occur during development, scale up, manufacturing or on storage, and also enables optimization of solid form, by allowing for a close understanding of the form being expressed.
Moreover, XRPD is the key technique utilized to carry out polymorphic risk assessments, polymorph and salt screening studies, phase purity assessments, and batch release testing for solid form.
Methodologies can be qualitative (pattern matching), function as limit tests or quantitative.
Our service offering includes XRPD method development, pre-validation, validation and method transfers, plus storage stability studies.
Crystallinity and Amorphicity
XRPD analysis enables the qualitative and quantitative assessment of the degree of crystallinity of a powder sample. By utilizing the relationship between crystallinity and pattern intensity, and controlling for factors such as particle size and morphology, indicative comparisons may be made between samples of the same type. Quantitative methodologies require the preparation of calibration standards; our micronizing, milling and blending capability enable the preparation of reference materials and calibration blends.
XRPD is a key companion technique to isothermal calorimetry by perfusion (ITC) and dynamic vapor sorption (DVS) for amorphous content determination.
