In-house characterization of protein powder

Christian Grundahl Hartmann, Ole Faurskov Nielsen, Kenny Ståhl, Pernille Harris

Research output: Contribution to journalJournal articlepeer-review


X-ray powder diffraction patterns of lysozyme and insulin were recorded on a standard in-house powder diffractometer. The experimental powder diffraction patterns were compared with patterns calculated from Protein Data Bank coordinate data. Good agreement was obtained by including straightforward corrections for background, unit-cell parameters, disordered bulk solvent and geometric factors. In particular the solvent correction was found crucial for a good agreement. A revised Lorentz factor was derived, which gave a minor, but significant, improvement to the fit in the low-angle region. An attempt to include calculated H-atom positions did not improve the overall fit and was abandoned. The method devised was shown to be a quick and convenient tool for distinguishing precipitates and polymorphs of proteins.
Original languageEnglish
JournalJournal of Applied Crystallography
Issue number4
Pages (from-to)876-882
Publication statusPublished - 2010


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